https://community.element14.com/products/raspberry-pi/w/documents/4317/raspberry-pi-4-model-b-default-gpio-pinout-with-poe-headeren-USTelligent Community 12https://community.element14.com/products/raspberry-pi/w/documents/4317/raspberry-pi-4-model-b-default-gpio-pinout-with-poe-headerFri, 14 Jul 2023 13:56:47 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:50d04d22-6210-4f93-937b-7661df8ac0accstantonhttps://community.element14.com/products/raspberry-pi/w/documents/4317/raspberry-pi-4-model-b-default-gpio-pinout-with-poe-header#commentsCurrent Revision posted to Documents by cstanton on 7/14/2023 1:56:47 PM<br /> <p style="margin:0;padding:0px;padding-top:10px;">&nbsp;To help you with your projects and setting&nbsp;up your electronic circuits, here&#39;s a detailed diagram of the pin block(s) on the Raspberry Pi 4, Model B.</p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;">Click the image for an enlarged version:</p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;"><span><a href="https://community.element14.com/resized-image/__size/615x900/__key/communityserver-wikis-components-files/00-00-00-01-69/8154.contentimage_5F00_151701.png"><img alt="image" src="https://community-storage.element14.com/communityserver-components-secureimagefileviewer/communityserver/wikis/components/files/00/00/00/01/69/8154.contentimage_151701.png-615x900.png?sv=2016-05-31&amp;sr=b&amp;sig=oK%2FZOHUTWuhRPtj4jZBS5jjrEtsYMWh9Smv7QkDdQlQ%3D&amp;se=2026-05-10T23%3A59%3A59Z&amp;sp=r&amp;_=BL9N/rW0RdLfdjC46Q3l8Q==" style="max-height: 900px;max-width: 615px;" /></a></span></p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;">Here is the Raspberry Pi 4 default GPIO pinout for the 40 pin J8 header. This is the configuration of the pins as you&#39;ll receive it when you first boot up Raspbian, or NOOBS with Raspbian. However, did you know that they are configurable? Yes, you can change the allocation of the Serial Peripheral Interface BUS on the pins, or decide that you don&#39;t want two Inter-Integrated Circuit (I2C) Serial BUS after all.</p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;">In the diagram you&#39;ll see that the layout is colour coded with a legend; these are pins which are associated with one another purely by function (or not, in case of the green), and so they are a &#39;family&#39; of pins that are useful together. But what if your project actually requires that you don&#39;t need SPI, or that you require two sets of SPI pins?</p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;">There are alternative functions for almost all of the pins. Here&#39;s a chart that helps to demonstrate what the alternative functions of the pins can be, and in bold and highlighted are what the defaults are for these pins:</p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;"><span><a href="https://community.element14.com/resized-image/__size/826x821/__key/communityserver-wikis-components-files/00-00-00-01-69/6011.contentimage_5F00_151702.png"><img loading="lazy" alt="image" src="https://community-storage.element14.com/communityserver-components-secureimagefileviewer/communityserver/wikis/components/files/00/00/00/01/69/6011.contentimage_151702.png-826x821.png?sv=2016-05-31&amp;sr=b&amp;sig=KzMHW7faNWosXaPXvTjsGe%2Fg573E1ISLnMdga8MBHL4%3D&amp;se=2026-05-10T23%3A59%3A59Z&amp;sp=r&amp;_=SIf9dsVDwTu4zgcoP0EKDA==" style="max-height: 821px;max-width: 826px;" /></a></span></p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;">Using these pins, they are referred to as &#39;ARM Peripherals&#39;, because after all, we&#39;re using an ARM processor by Broadcom. If you want to read into these in detail, you can look at the attached document. You&#39;ll find it pretty heavy going if you are not used to the technical information.</p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;">There are also useful libraries and websites which can help you to understand more about this information, such as The <a class="jive-link-external-small" href="http://wiringpi.com/the-gpio-utility/" rel="nofollow ugc noopener noreferrer" target="_blank" data-icid="rpimain-pi-gpio-pi4doc">GPIO Utility by Wiring Pi</a> and Gadgetoid and RogueHAL13&#39;s <a class="jive-link-external-small" href="https://pinout.xyz/" rel="nofollow ugc noopener noreferrer" target="_blank">pinout.xyz</a> - be careful not to be caught out though, as the GPIO pins are also referenced as &#39;BCM&#39; pins (meaning Broadcom) to help reduce confusion from the physical pins.</p> <p style="margin:0;padding:0px;"></p> <p style="margin:0;">Changing the default configuration is considered advanced, and isn&#39;t for the faint of heart, so enjoy going down the rabbit hole for your project!</p> <p style="margin:0;"></p> <h2 style="margin:0;"><strong>Want to know more?</strong></h2> <p style="margin:0;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4354/meet-the-new-raspberry-pi-4-model-b---element14-presents">Meet The New Raspberry Pi 4 Model B - element14 Presents</a></p> <p style="margin:0;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4320/raspberry-pi-4-model-b---technical-specifications">Raspberry Pi 4 Model B - Technical Specifications</a></p> <p style="margin:0;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4318/raspberry-pi-4-model-b-frequently-asked-questions-faq"> Raspberry Pi 4 Model B Frequently Asked Questions (FAQ)</a></p> <p style="margin:0;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4319/benchmarking-the-raspberry-pi-4-model-b">Benchmarking the Raspberry Pi 4 Model B</a></p> <p style="margin:0;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4348/which-accessories-are-compatible-with-the-new-raspberry-pi-4-model-b">Which accessories are compatible with the New Raspberry Pi 4 Model B?</a></p> <p style="margin:0;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4329/do-you-know-your-pi-from-pie-raspberry-pi-quiz">Do You Know Your Pi from Pie? Raspberry Pi Quiz!</a></p> <p style="margin:0;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4322/eben-upton-talks-about-the-new-raspberry-pi-4-model-b">Eben Upton talks about the new Raspberry Pi 4 Model B</a></p> <p style="margin:0;padding:0px;"></p> <h2 style="margin:0;padding:0px;"><strong>Want to buy the new Raspberry Pi 4 Model B?</strong></h2> <p style="margin:0;padding:0px;"></p> <table class="jiveBorder" style="border:1px solid #C6C6C6;" border="1"> <thead> <tr> <th style="background-color:#f2f2f2;border:1px solid #C6C6C6;color:#505050;padding:6px;text-align:left;">Product Name</th> <th style="background-color:#f2f2f2;border:1px solid #C6C6C6;color:#505050;padding:6px;text-align:left;">Manufacturer</th> <th style="background-color:#f2f2f2;border:1px solid #C6C6C6;color:#505050;padding:6px;text-align:left;"></th> </tr> </thead> <tbody> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">RASPBERRY PI 4 MODEL B, 1GB</td> <td style="border:1px solid #C6C6C6;padding:6px;">Raspberry Pi</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-16110" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3051885&nsku=02AH3161&COM=e14c-rpi4-pinout&CMP=e14c-rpi4-pinout&osetc=e14c-rpi4-pinout" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('16110'));" data-farnell="3051885" data-newark="02AH3161" data-comoverride="rpi4-pinout" data-cmpoverride="rpi4-pinout" data-cpc="SC15183" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">RASPBERRY PI 4 MODEL B, 2GB</td> <td style="border:1px solid #C6C6C6;padding:6px;">Raspberry Pi</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-6039a" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3051886&nsku=02AH3162&COM=e14c-rpi4-pinout&CMP=e14c-rpi4-pinout&osetc=e14c-rpi4-pinout" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('6039a'));" data-farnell="3051886" data-newark="02AH3162" data-comoverride="rpi4-pinout" data-cmpoverride="rpi4-pinout" data-cpc="SC15184" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">RASPBERRY PI 4 MODEL B, 4GB</td> <td style="border:1px solid #C6C6C6;padding:6px;">Raspberry Pi</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-652dd" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3051887&nsku=02AH3164&COM=e14c-rpi4-pinout&CMP=e14c-rpi4-pinout&osetc=e14c-rpi4-pinout" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('652dd'));" data-farnell="3051887" data-newark="02AH3164" data-comoverride="rpi4-pinout" data-cmpoverride="rpi4-pinout" data-cpc="SC15185" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">RASPBERRY PI 4 MODEL B, 8GB</td> <td style="border:1px solid #C6C6C6;padding:6px;">Raspberry Pi</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-e6289" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3369503&nsku=64AH2041&COM=e14c-rpi4-pinout&CMP=e14c-rpi4-pinout&osetc=e14c-rpi4-pinout" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('e6289'));" data-farnell="3369503" data-newark="64AH2041" data-comoverride="rpi4-pinout" data-cmpoverride="rpi4-pinout" data-cpc="SC15613" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> </tbody> </table> <div style="font-weight:bold;margin:15px 0 5px 0;"></div> <h2 class="migration-injected-attachments">Supplemental Content:</h2> <div class="migration-injected-attachments">&nbsp;<a href="https://community.element14.com/products/raspberry-pi/m/files/147858">Raspberry Pi 4 - BCM2835 ARM Peripherals</a>&nbsp;</div> <div class="migration-injected-attachments"></div> <div style="border:1px solid #c6c6c6;padding:8px;"> <div style="float:left;padding:6px;vertical-align:top;width:65px;"><a href="http://www.raspberrypi.org/" rel="nofollow ugc noopener noreferrer" target="_blank"><img loading="lazy" alt="image" style="height:65px;" src="/e14/assets/legacy/2018/Pilogo_rpi65.png" /></a></div> <p style="color:#007fac;font-size:18px;font-weight:bold;margin:0;"><a class="jivecontainerTT-hover-container jive-link-community-small" href="/products/raspberry-pi/"><span style="color:#d6264f;font-weight:bold;">NEW!</span> Raspberry Pi 4</a></p> <p style="margin:0;"><span style="padding:0px 5px 2px;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4320/raspberry-pi-4-model-b---technical-specifications" data-icid="rpimain-pi-gpio-pi4doc">Technical Specifications</a> | <span style="padding:0px 5px 2px;"><a class="jive-link-wiki-small" href="#">GPIO Pin Out</a></span> | <span style="padding:0px 5px 2px;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4319/benchmarking-the-raspberry-pi-4-model-b">Benchmark Tests</a></span> | <span style="padding:0px 5px 2px;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/17004/raspberry-pi-4-3-b-pi-3-pi-2-b-a-comparison-chart">Comparison Chart</a></span> | <span style="padding:0px 5px 2px;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4318/raspberry-pi-4-model-b-frequently-asked-questions-faq">FAQ</a></span> | <span style="padding:0px 5px 2px;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4329/do-you-know-your-pi-from-pie-raspberry-pi-quiz">Quiz</a></span> | <span style="padding:0px 5px 2px;"><a class="" href="https://www.element14.com/community/community/raspberry-pi/raspberry-pi-accessories">Pi Accessories</a></span> | <span style="padding:0px 5px 2px;"><a class="jivecontainerTT-hover-container jive-link-community-small" href="/products/raspberry-pi/raspberrypi_projects/">Pi Projects</a></span></span> | <span style="padding:0px 5px 2px;"><a class="jive-link-roadTest" href="https://www.element14.com/community/roadTests/2081/l/roadtest-the-raspberry-pi-4-model-b-2gb?ICID=rpimain-pi-gpio-pi4doc">RoadTest</a></span></p> <div style="clear:both;"></div> </div><div style="clear:both;"></div> <div style="font-size: 90%;">Tags: gpio, raspberry pi 4 general purpose input output, rpi4, raspberry pi 4 gpio pinout, raspberry pi 4, raspberry pi, pinout, rpi4 pinout</div> https://community.element14.com/products/raspberry-pi/w/documents/4317/raspberry-pi-4-model-b-default-gpio-pinout-with-poe-header/revision/3Fri, 14 Jul 2023 13:53:57 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:50d04d22-6210-4f93-937b-7661df8ac0accstantonhttps://community.element14.com/products/raspberry-pi/w/documents/4317/raspberry-pi-4-model-b-default-gpio-pinout-with-poe-header#commentsRevision 3 posted to Documents by cstanton on 7/14/2023 1:53:57 PM<br /> <p style="margin:0;padding:0px;padding-top:10px;">&nbsp;To help you with your projects and setting&nbsp;up your electronic circuits, here&#39;s a detailed diagram of the pin block(s) on the Raspberry Pi 4, Model B.</p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;">Click the image for an enlarged version:</p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;"><span><a href="https://community.element14.com/resized-image/__size/615x900/__key/communityserver-wikis-components-files/00-00-00-01-69/8154.contentimage_5F00_151701.png"><img alt="image" src="https://community-storage.element14.com/communityserver-components-secureimagefileviewer/communityserver/wikis/components/files/00/00/00/01/69/8154.contentimage_151701.png-615x900.png?sv=2016-05-31&amp;sr=b&amp;sig=oK%2FZOHUTWuhRPtj4jZBS5jjrEtsYMWh9Smv7QkDdQlQ%3D&amp;se=2026-05-10T23%3A59%3A59Z&amp;sp=r&amp;_=BL9N/rW0RdLfdjC46Q3l8Q==" style="max-height: 900px;max-width: 615px;" /></a></span></p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;">Here is the Raspberry Pi 4 default GPIO pinout for the 40 pin J8 header. This is the configuration of the pins as you&#39;ll receive it when you first boot up Raspbian, or NOOBS with Raspbian. However, did you know that they are configurable? Yes, you can change the allocation of the Serial Peripheral Interface BUS on the pins, or decide that you don&#39;t want two Inter-Integrated Circuit (I2C) Serial BUS after all.</p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;">In the diagram you&#39;ll see that the layout is colour coded with a legend; these are pins which are associated with one another purely by function (or not, in case of the green), and so they are a &#39;family&#39; of pins that are useful together. But what if your project actually requires that you don&#39;t need SPI, or that you require two sets of SPI pins?</p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;">There are alternative functions for almost all of the pins. Here&#39;s a chart that helps to demonstrate what the alternative functions of the pins can be, and in bold and highlighted are what the defaults are for these pins:</p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;"><span><a href="https://community.element14.com/resized-image/__size/826x821/__key/communityserver-wikis-components-files/00-00-00-01-69/6011.contentimage_5F00_151702.png"><img loading="lazy" alt="image" src="https://community-storage.element14.com/communityserver-components-secureimagefileviewer/communityserver/wikis/components/files/00/00/00/01/69/6011.contentimage_151702.png-826x821.png?sv=2016-05-31&amp;sr=b&amp;sig=KzMHW7faNWosXaPXvTjsGe%2Fg573E1ISLnMdga8MBHL4%3D&amp;se=2026-05-10T23%3A59%3A59Z&amp;sp=r&amp;_=SIf9dsVDwTu4zgcoP0EKDA==" style="max-height: 821px;max-width: 826px;" /></a></span></p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;">Using these pins, they are referred to as &#39;ARM Peripherals&#39;, because after all, we&#39;re using an ARM processor by Broadcom. If you want to read into these in detail, you can look at the attached document. You&#39;ll find it pretty heavy going if you are not used to the technical information.</p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;">There are also useful libraries and websites which can help you to understand more about this information, such as The <a class="jive-link-external-small" href="http://wiringpi.com/the-gpio-utility/" rel="nofollow ugc noopener noreferrer" target="_blank">GPIO Utility by Wiring Pi</a> and Gadgetoid and RogueHAL13&#39;s <a class="jive-link-external-small" href="https://pinout.xyz/" rel="nofollow ugc noopener noreferrer" target="_blank">pinout.xyz</a> - be careful not to be caught out though, as the GPIO pins are also referenced as &#39;BCM&#39; pins (meaning Broadcom) to help reduce confusion from the physical pins.</p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;">Changing the default configuration is considered advanced, and isn&#39;t for the faint of heart, so enjoy going down the rabbit hole for your project!</p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;"><strong>Want to know more?</strong></p> <p style="margin:0;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4354/meet-the-new-raspberry-pi-4-model-b---element14-presents">Meet The New Raspberry Pi 4 Model B - element14 Presents</a></p> <p style="margin:0;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4320/raspberry-pi-4-model-b---technical-specifications">Raspberry Pi 4 Model B - Technical Specifications</a></p> <p style="margin:0;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4318/raspberry-pi-4-model-b-frequently-asked-questions-faq"> Raspberry Pi 4 Model B Frequently Asked Questions (FAQ)</a></p> <p style="margin:0;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4319/benchmarking-the-raspberry-pi-4-model-b">Benchmarking the Raspberry Pi 4 Model B</a></p> <p style="margin:0;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4348/which-accessories-are-compatible-with-the-new-raspberry-pi-4-model-b">Which accessories are compatible with the New Raspberry Pi 4 Model B?</a></p> <p style="margin:0;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4329/do-you-know-your-pi-from-pie-raspberry-pi-quiz">Do You Know Your Pi from Pie? Raspberry Pi Quiz!</a></p> <p style="margin:0;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4322/eben-upton-talks-about-the-new-raspberry-pi-4-model-b">Eben Upton talks about the new Raspberry Pi 4 Model B</a></p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;"><strong>Want to buy the new Raspberry Pi 4 Model B?</strong></p> <p style="margin:0;padding:0px;">&nbsp;</p> <table class="jiveBorder" style="border:1px solid #C6C6C6;" border="1"> <thead> <tr> <th style="background-color:#f2f2f2;border:1px solid #C6C6C6;color:#505050;padding:6px;text-align:left;">Product Name</th> <th style="background-color:#f2f2f2;border:1px solid #C6C6C6;color:#505050;padding:6px;text-align:left;">Manufacturer</th> <th style="background-color:#f2f2f2;border:1px solid #C6C6C6;color:#505050;padding:6px;text-align:left;"></th> </tr> </thead> <tbody> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">RASPBERRY PI 4 MODEL B, 1GB</td> <td style="border:1px solid #C6C6C6;padding:6px;">Raspberry Pi</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-990fc" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3051885&nsku=02AH3161&COM=e14c-rpi4-pinout&CMP=e14c-rpi4-pinout&osetc=e14c-rpi4-pinout" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('990fc'));" data-farnell="3051885" data-newark="02AH3161" data-comoverride="rpi4-pinout" data-cmpoverride="rpi4-pinout" data-cpc="SC15183" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">RASPBERRY PI 4 MODEL B, 2GB</td> <td style="border:1px solid #C6C6C6;padding:6px;">Raspberry Pi</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-b6da6" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3051886&nsku=02AH3162&COM=e14c-rpi4-pinout&CMP=e14c-rpi4-pinout&osetc=e14c-rpi4-pinout" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('b6da6'));" data-farnell="3051886" data-newark="02AH3162" data-comoverride="rpi4-pinout" data-cmpoverride="rpi4-pinout" data-cpc="SC15184" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">RASPBERRY PI 4 MODEL B, 4GB</td> <td style="border:1px solid #C6C6C6;padding:6px;">Raspberry Pi</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-05b83" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3051887&nsku=02AH3164&COM=e14c-rpi4-pinout&CMP=e14c-rpi4-pinout&osetc=e14c-rpi4-pinout" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('05b83'));" data-farnell="3051887" data-newark="02AH3164" data-comoverride="rpi4-pinout" data-cmpoverride="rpi4-pinout" data-cpc="SC15185" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">RASPBERRY PI 4 MODEL B, 8GB</td> <td style="border:1px solid #C6C6C6;padding:6px;">Raspberry Pi</td> <td style="border:1px solid #C6C6C6;padding:6px;"><a id="e14-product-link-d4298" data-at-areainteracted="rte-content" data-at-type="click" data-at-link-type="link" href="https://referral.element14.com/OrderCodeView?fsku=3369503&nsku=64AH2041&COM=e14c-rpi4-pinout&CMP=e14c-rpi4-pinout&osetc=e14c-rpi4-pinout" data-at-label="PRODUCT_POPUP_OPEN"class="e14-embedded e14_shopping-cart-far e14-link" onclick="event.preventDefault();e14.func.displayProduct(e14.meta.user.country, this, 'embedded-link', e14.func.getProductLinkJSON('d4298'));" data-farnell="3369503" data-newark="64AH2041" data-comoverride="rpi4-pinout" data-cmpoverride="rpi4-pinout" data-cpc="SC15613" data-avnetemea="" data-avnetema="" data-avnetasia="" >Buy Now</a> </td> </tr> </tbody> </table> <div class="migration-injected-attachments"> <div style="font-weight:bold;margin:15px 0 5px 0;">Attachments:</div> <div></div> <table style="border:0;"> <tbody> <tr> <td width="160"><span id="attid_https://www.element14.com/community/api/core/v3/attachments/283517" class="_se_attachment"><a href="https://community.element14.com/cfs-file/__key/communityserver-wikis-components-files/00-00-00-01-69/BCM2835_2D00_ARM_2D00_Peripherals.pdf">community.element14.com/.../BCM2835_2D00_ARM_2D00_Peripherals.pdf</a></span></td> <td><span style="font-size:80%;">BCM2835-ARM-Peripherals.pdf</span></td> </tr> </tbody> </table> </div> <div style="border:1px solid #c6c6c6;padding:8px;"> <div style="float:left;padding:6px;vertical-align:top;width:65px;"><a href="http://www.raspberrypi.org/" rel="nofollow ugc noopener noreferrer" target="_blank"><img loading="lazy" alt="image" style="height:65px;" src="/e14/assets/legacy/2018/Pilogo_rpi65.png" /></a></div> <p style="color:#007fac;font-size:18px;font-weight:bold;margin:0;"><a class="jivecontainerTT-hover-container jive-link-community-small" href="/products/raspberry-pi/"><span style="color:#d6264f;font-weight:bold;">NEW!</span> Raspberry Pi 4</a></p> <p style="margin:0;"><span style="padding:0px 5px 2px;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4320/raspberry-pi-4-model-b---technical-specifications">Technical Specifications</a> | <span style="padding:0px 5px 2px;"><a class="jive-link-wiki-small" href="#">GPIO Pin Out</a></span> | <span style="padding:0px 5px 2px;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4319/benchmarking-the-raspberry-pi-4-model-b">Benchmark Tests</a></span> | <span style="padding:0px 5px 2px;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/17004/raspberry-pi-4-3-b-pi-3-pi-2-b-a-comparison-chart">Comparison Chart</a></span> | <span style="padding:0px 5px 2px;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4318/raspberry-pi-4-model-b-frequently-asked-questions-faq">FAQ</a></span> | <span style="padding:0px 5px 2px;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4329/do-you-know-your-pi-from-pie-raspberry-pi-quiz">Quiz</a></span> | <span style="padding:0px 5px 2px;"><a class="" href="https://www.element14.com/community/community/raspberry-pi/raspberry-pi-accessories?ICID=rpimain-pi-gpio-pi4doc">Pi Accessories</a></span> | <span style="padding:0px 5px 2px;"><a class="jivecontainerTT-hover-container jive-link-community-small" href="/products/raspberry-pi/raspberrypi_projects/">Pi Projects</a></span></span> | <span style="padding:0px 5px 2px;"><a class="jive-link-roadTest" href="https://www.element14.com/community/roadTests/2081/l/roadtest-the-raspberry-pi-4-model-b-2gb?ICID=rpimain-pi-gpio-pi4doc">RoadTest</a></span></p> <div style="clear:both;"></div> </div><div style="clear:both;"></div> <div style="font-size: 90%;">Tags: gpio, raspberry pi 4 general purpose input output, rpi4, raspberry pi 4 gpio pinout, raspberry pi 4, raspberry pi, pinout, rpi4 pinout</div> https://community.element14.com/products/raspberry-pi/w/documents/4317/raspberry-pi-4-model-b-default-gpio-pinout-with-poe-header/revision/2Mon, 12 Sep 2022 10:13:35 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:50d04d22-6210-4f93-937b-7661df8ac0accstantonhttps://community.element14.com/products/raspberry-pi/w/documents/4317/raspberry-pi-4-model-b-default-gpio-pinout-with-poe-header#commentsRevision 2 posted to Documents by cstanton on 9/12/2022 10:13:35 AM<br /> <p style="margin:0;padding:0px;padding-top:10px;">&nbsp;To help you with your projects and setting&nbsp;up your electronic circuits, here&#39;s a detailed diagram of the pin block(s) on the Raspberry Pi 4, Model B.</p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;">Click the image for an enlarged version:</p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;"><span><a href="https://community.element14.com/resized-image/__size/615x900/__key/communityserver-wikis-components-files/00-00-00-01-69/8154.contentimage_5F00_151701.png"><img alt="image" src="https://community-storage.element14.com/communityserver-components-secureimagefileviewer/communityserver/wikis/components/files/00/00/00/01/69/8154.contentimage_151701.png-615x900.png?sv=2016-05-31&amp;sr=b&amp;sig=oK%2FZOHUTWuhRPtj4jZBS5jjrEtsYMWh9Smv7QkDdQlQ%3D&amp;se=2026-05-10T23%3A59%3A59Z&amp;sp=r&amp;_=BL9N/rW0RdLfdjC46Q3l8Q==" style="max-height: 900px;max-width: 615px;" /></a></span></p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;">Here is the Raspberry Pi 4 default GPIO pinout for the 40 pin J8 header. This is the configuration of the pins as you&#39;ll receive it when you first boot up Raspbian, or NOOBS with Raspbian. However, did you know that they are configurable? Yes, you can change the allocation of the Serial Peripheral Interface BUS on the pins, or decide that you don&#39;t want two Inter-Integrated Circuit (I2C) Serial BUS after all.</p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;">In the diagram you&#39;ll see that the layout is colour coded with a legend; these are pins which are associated with one another purely by function (or not, in case of the green), and so they are a &#39;family&#39; of pins that are useful together. But what if your project actually requires that you don&#39;t need SPI, or that you require two sets of SPI pins?</p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;">There are alternative functions for almost all of the pins. Here&#39;s a chart that helps to demonstrate what the alternative functions of the pins can be, and in bold and highlighted are what the defaults are for these pins:</p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;"><span><a href="https://community.element14.com/resized-image/__size/826x821/__key/communityserver-wikis-components-files/00-00-00-01-69/6011.contentimage_5F00_151702.png"><img loading="lazy" alt="image" src="https://community-storage.element14.com/communityserver-components-secureimagefileviewer/communityserver/wikis/components/files/00/00/00/01/69/6011.contentimage_151702.png-826x821.png?sv=2016-05-31&amp;sr=b&amp;sig=KzMHW7faNWosXaPXvTjsGe%2Fg573E1ISLnMdga8MBHL4%3D&amp;se=2026-05-10T23%3A59%3A59Z&amp;sp=r&amp;_=SIf9dsVDwTu4zgcoP0EKDA==" style="max-height: 821px;max-width: 826px;" /></a></span></p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;">Using these pins, they are referred to as &#39;ARM Peripherals&#39;, because after all, we&#39;re using an ARM processor by Broadcom. If you want to read into these in detail, you can look at the attached document. You&#39;ll find it pretty heavy going if you are not used to the technical information.</p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;">There are also useful libraries and websites which can help you to understand more about this information, such as The <a class="jive-link-external-small" href="http://wiringpi.com/the-gpio-utility/" rel="nofollow ugc noopener noreferrer" target="_blank">GPIO Utility by Wiring Pi</a> and Gadgetoid and RogueHAL13&#39;s <a class="jive-link-external-small" href="https://pinout.xyz/" rel="nofollow ugc noopener noreferrer" target="_blank">pinout.xyz</a> - be careful not to be caught out though, as the GPIO pins are also referenced as &#39;BCM&#39; pins (meaning Broadcom) to help reduce confusion from the physical pins.</p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;">Changing the default configuration is considered advanced, and isn&#39;t for the faint of heart, so enjoy going down the rabbit hole for your project!</p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;"><strong>Want to know more?</strong></p> <p style="margin:0;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4354/meet-the-new-raspberry-pi-4-model-b---element14-presents">Meet The New Raspberry Pi 4 Model B - element14 Presents</a></p> <p style="margin:0;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4320/raspberry-pi-4-model-b---technical-specifications">Raspberry Pi 4 Model B - Technical Specifications</a></p> <p style="margin:0;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4318/raspberry-pi-4-model-b-frequently-asked-questions-faq"> Raspberry Pi 4 Model B Frequently Asked Questions (FAQ)</a></p> <p style="margin:0;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4319/benchmarking-the-raspberry-pi-4-model-b">Benchmarking the Raspberry Pi 4 Model B</a></p> <p style="margin:0;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4348/which-accessories-are-compatible-with-the-new-raspberry-pi-4-model-b">Which accessories are compatible with the New Raspberry Pi 4 Model B?</a></p> <p style="margin:0;"><a class="jive-link-wiki-small" href="#">Raspberry Pi 4 Model B Default GPIO Pinout with PoE Header</a></p> <p style="margin:0;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4329/do-you-know-your-pi-from-pie-raspberry-pi-quiz">Do You Know Your Pi from Pie? Raspberry Pi Quiz!</a></p> <p style="margin:0;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4322/eben-upton-talks-about-the-new-raspberry-pi-4-model-b">Eben Upton talks about the new Raspberry Pi 4 Model B</a></p> <p style="margin:0;padding:0px;">&nbsp;</p> <p style="margin:0;"><strong>Want to buy the new Raspberry Pi 4 Model B?</strong></p> <p style="margin:0;padding:0px;">&nbsp;</p> <table class="jiveBorder" style="border:1px solid #C6C6C6;" border="1"> <thead> <tr> <th style="background-color:#f2f2f2;border:1px solid #C6C6C6;color:#505050;padding:6px;text-align:left;">Product Name</th> <th style="background-color:#f2f2f2;border:1px solid #C6C6C6;color:#505050;padding:6px;text-align:left;">Manufacturer</th> <th style="background-color:#f2f2f2;border:1px solid #C6C6C6;color:#505050;padding:6px;text-align:left;"></th> </tr> </thead> <tbody> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">RASPBERRY PI 4 MODEL B, 1GB</td> <td style="border:1px solid #C6C6C6;padding:6px;">Raspberry Pi</td> <td style="border:1px solid #C6C6C6;padding:6px;"><span><span id="addProduct-dtgJ2aFi-linked" class="e14-init-shown e14-product-link-buynow" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=3051885~1&amp;nsku=02AH3161~1&amp;COM=noscript" rel="noopener noreferrer" target="_blank"><span class="pf-widget-map pf-productlink-cart-icon"></span></a><a class="jive-link-product pf-embedded-product-link" href="https://www.element14.com/community/view-product.jspa?fsku=3051885~1&amp;nsku=02AH3161~1&amp;COM=noscript" rel="noopener noreferrer" target="_blank">Buy Now</a></span><span id="addProduct-dtgJ2aFi-unlinked" class="e14-init-hidden">Buy Now</span></span></td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">RASPBERRY PI 4 MODEL B, 2GB</td> <td style="border:1px solid #C6C6C6;padding:6px;">Raspberry Pi</td> <td style="border:1px solid #C6C6C6;padding:6px;"><span><span id="addProduct-E3z2LmZN-linked" class="e14-init-shown e14-product-link-buynow" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=3051886~1&amp;nsku=02AH3162~1&amp;COM=noscript" rel="noopener noreferrer" target="_blank"><span class="pf-widget-map pf-productlink-cart-icon"></span></a><a class="jive-link-product pf-embedded-product-link" href="https://www.element14.com/community/view-product.jspa?fsku=3051886~1&amp;nsku=02AH3162~1&amp;COM=noscript" rel="noopener noreferrer" target="_blank">Buy Now</a></span><span id="addProduct-E3z2LmZN-unlinked" class="e14-init-hidden">Buy Now</span></span></td> </tr> <tr> <td style="border:1px solid #C6C6C6;padding:6px;">RASPBERRY PI 4 MODEL B, 4GB</td> <td style="border:1px solid #C6C6C6;padding:6px;">Raspberry Pi</td> <td style="border:1px solid #C6C6C6;padding:6px;"><span><span id="addProduct-XUi6GpCB-linked" class="e14-init-shown e14-product-link-buynow" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=3051887~1&amp;nsku=02AH3164~1&amp;COM=noscript" rel="noopener noreferrer" target="_blank"><span class="pf-widget-map pf-productlink-cart-icon"></span></a><a class="jive-link-product pf-embedded-product-link" href="https://www.element14.com/community/view-product.jspa?fsku=3051887~1&amp;nsku=02AH3164~1&amp;COM=noscript" rel="noopener noreferrer" target="_blank">Buy Now</a></span><span id="addProduct-XUi6GpCB-unlinked" class="e14-init-hidden">Buy Now</span></span></td> </tr> </tbody> </table> <div class="migration-injected-attachments"> <div style="font-weight:bold;margin:15px 0 5px 0;">Attachments:</div> <div></div> <table style="border:0;"> <tbody> <tr> <td width="160"><span id="attid_https://www.element14.com/community/api/core/v3/attachments/283517" class="_se_attachment"><a href="https://community.element14.com/cfs-file/__key/communityserver-wikis-components-files/00-00-00-01-69/BCM2835_2D00_ARM_2D00_Peripherals.pdf">community.element14.com/.../BCM2835_2D00_ARM_2D00_Peripherals.pdf</a></span></td> <td><span style="font-size:80%;">BCM2835-ARM-Peripherals.pdf</span></td> </tr> </tbody> </table> </div> <div style="border:1px solid #c6c6c6;padding:8px;"> <div style="float:left;padding:6px;vertical-align:top;width:65px;"><a href="http://www.raspberrypi.org/" rel="nofollow ugc noopener noreferrer" target="_blank"><img loading="lazy" alt="image" style="height:65px;" src="/e14/assets/legacy/2018/Pilogo_rpi65.png" /></a></div> <p style="color:#007fac;font-size:18px;font-weight:bold;margin:0;"><a class="jivecontainerTT-hover-container jive-link-community-small" href="/products/raspberry-pi/"><span style="color:#d6264f;font-weight:bold;">NEW!</span> Raspberry Pi 4</a></p> <p style="margin:0;"><span style="padding:0px 5px 2px;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4320/raspberry-pi-4-model-b---technical-specifications">Technical Specifications</a> | <span style="padding:0px 5px 2px;"><a class="jive-link-wiki-small" href="#">GPIO Pin Out</a></span> | <span style="padding:0px 5px 2px;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4319/benchmarking-the-raspberry-pi-4-model-b">Benchmark Tests</a></span> | <span style="padding:0px 5px 2px;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/17004/raspberry-pi-4-3-b-pi-3-pi-2-b-a-comparison-chart">Comparison Chart</a></span> | <span style="padding:0px 5px 2px;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4318/raspberry-pi-4-model-b-frequently-asked-questions-faq">FAQ</a></span> | <span style="padding:0px 5px 2px;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4329/do-you-know-your-pi-from-pie-raspberry-pi-quiz">Quiz</a></span> | <span style="padding:0px 5px 2px;"><a class="" href="https://www.element14.com/community/community/raspberry-pi/raspberry-pi-accessories?ICID=rpimain-pi-gpio-pi4doc">Pi Accessories</a></span> | <span style="padding:0px 5px 2px;"><a class="jivecontainerTT-hover-container jive-link-community-small" href="/products/raspberry-pi/raspberrypi_projects/">Pi Projects</a></span></span> | <span style="padding:0px 5px 2px;"><a class="jive-link-roadTest" href="https://www.element14.com/community/roadTests/2081/l/roadtest-the-raspberry-pi-4-model-b-2gb?ICID=rpimain-pi-gpio-pi4doc">RoadTest</a></span></p> <div style="clear:both;"></div> </div><div style="clear:both;"></div> <div style="font-size: 90%;">Tags: gpio, raspberry pi 4 general purpose input output, raspberry pi 4 gpio pinout, raspberry pi 4, raspberry pi, pinout</div> https://community.element14.com/products/raspberry-pi/w/documents/4317/raspberry-pi-4-model-b-default-gpio-pinout-with-poe-header/revision/1Wed, 11 Aug 2021 12:16:36 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:50d04d22-6210-4f93-937b-7661df8ac0accstantonhttps://community.element14.com/products/raspberry-pi/w/documents/4317/raspberry-pi-4-model-b-default-gpio-pinout-with-poe-header#commentsRevision 1 posted to Documents by cstanton on 8/11/2021 12:16:36 PM<br /> <div style="padding:8px;border:1px solid #c6c6c6;"><div style="float:left;vertical-align:top;padding:6px;width:65px;"><a href="http://www.raspberrypi.org/" rel="nofollow ugc noopener" target="_blank"><img alt="image" src="/e14/assets/legacy/2018/Pilogo_rpi65.png" style="height:65px;" /></a></div><p style="margin:0;font-weight:bold;font-size:18px;color:#007fac;"><a class="jivecontainerTT-hover-container jive-link-community-small" href="/products/raspberry-pi/"><span style="color:#d6264f;font-weight:bold;">NEW!</span> Raspberry Pi 4</a></p><p style="margin:0;"><span style="padding:0px 5px 2px;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4320/raspberry-pi-4-model-b---technical-specifications">Technical Specifications</a> | <span style="padding:0px 5px 2px;"><a class="jive-link-wiki-small" href="#">GPIO Pin Out</a></span> | <span style="padding:0px 5px 2px;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4319/benchmarking-the-raspberry-pi-4-model-b">Benchmark Tests</a></span> | <span style="padding:0px 5px 2px;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/17004/raspberry-pi-4-3-b-pi-3-pi-2-b-a-comparison-chart">Comparison Chart</a></span> | <span style="padding:0px 5px 2px;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4318/raspberry-pi-4-model-b-frequently-asked-questions-faq">FAQ</a></span> | <span style="padding:0px 5px 2px;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4329/do-you-know-your-pi-from-pie-raspberry-pi-quiz">Quiz</a></span> | <span style="padding:0px 5px 2px;"><a class="" href="https://www.element14.com/community/community/raspberry-pi/raspberry-pi-accessories?ICID=rpimain-pi-gpio-pi4doc">Pi Accessories</a></span> | <span style="padding:0px 5px 2px;"><a class="jivecontainerTT-hover-container jive-link-community-small" href="/products/raspberry-pi/raspberrypi_projects/">Pi Projects</a></span></span> | <span style="padding:0px 5px 2px;"><a class="jive-link-roadTest" href="https://www.element14.com/community/roadTests/2081/l/roadtest-the-raspberry-pi-4-model-b-2gb?ICID=rpimain-pi-gpio-pi4doc">RoadTest</a></span></p><div style="clear:both;"> </div></div><p style="margin:0;padding:0px;padding-top:10px;">&nbsp;</p><p style="margin:0;padding:0px;">&nbsp;</p><p style="margin:0;">Click the image for an enlarged version:</p><p style="margin:0;padding:0px;">&nbsp;</p><p style="margin:0;"><span><a href="https://community.element14.com/resized-image/__size/615x900/__key/communityserver-wikis-components-files/00-00-00-01-69/8154.contentimage_5F00_151701.png"><img loading="lazy" alt="image" src="https://community-storage.element14.com/communityserver-components-secureimagefileviewer/communityserver/wikis/components/files/00/00/00/01/69/8154.contentimage_151701.png-615x900.png?sv=2016-05-31&amp;sr=b&amp;sig=oK%2FZOHUTWuhRPtj4jZBS5jjrEtsYMWh9Smv7QkDdQlQ%3D&amp;se=2026-05-10T23%3A59%3A59Z&amp;sp=r&amp;_=BL9N/rW0RdLfdjC46Q3l8Q==" style="max-height: 900px;max-width: 615px;" /></a></span></p><p style="margin:0;padding:0px;">&nbsp;</p><p style="margin:0;">Here is the Raspberry Pi 4 default GPIO pinout for the 40 pin J8 header. This is the configuration of the pins as you&#39;ll receive it when you first boot up Raspbian, or NOOBS with Raspbian. However, did you know that they are configurable? Yes, you can change the allocation of the Serial Peripheral Interface BUS on the pins, or decide that you don&#39;t want two Inter-Integrated Circuit (I2C) Serial BUS after all.</p><p style="margin:0;padding:0px;">&nbsp;</p><p style="margin:0;">In the diagram you&#39;ll see that the layout is colour coded with a legend; these are pins which are associated with one another purely by function (or not, in case of the green), and so they are a &#39;family&#39; of pins that are useful together. But what if your project actually requires that you don&#39;t need SPI, or that you require two sets of SPI pins?</p><p style="margin:0;padding:0px;">&nbsp;</p><p style="margin:0;">There are alternative functions for almost all of the pins. Here&#39;s a chart that helps to demonstrate what the alternative functions of the pins can be, and in bold and highlighted are what the defaults are for these pins:</p><p style="margin:0;padding:0px;">&nbsp;</p><p style="margin:0;"><span><a href="https://community.element14.com/resized-image/__size/826x821/__key/communityserver-wikis-components-files/00-00-00-01-69/6011.contentimage_5F00_151702.png"><img loading="lazy" alt="image" src="https://community-storage.element14.com/communityserver-components-secureimagefileviewer/communityserver/wikis/components/files/00/00/00/01/69/6011.contentimage_151702.png-826x821.png?sv=2016-05-31&amp;sr=b&amp;sig=KzMHW7faNWosXaPXvTjsGe%2Fg573E1ISLnMdga8MBHL4%3D&amp;se=2026-05-10T23%3A59%3A59Z&amp;sp=r&amp;_=SIf9dsVDwTu4zgcoP0EKDA==" style="max-height: 821px;max-width: 826px;" /></a></span></p><p style="margin:0;padding:0px;">&nbsp;</p><p style="margin:0;">Using these pins, they are referred to as &#39;ARM Peripherals&#39;, because after all, we&#39;re using an ARM processor by Broadcom. If you want to read into these in detail, you can look at the attached document. You&#39;ll find it pretty heavy going if you are not used to the technical information.</p><p style="margin:0;padding:0px;">&nbsp;</p><p style="margin:0;">There are also useful libraries and websites which can help you to understand more about this information, such as The <a class="jive-link-external-small" href="http://wiringpi.com/the-gpio-utility/" rel="nofollow ugc noopener" target="_blank">GPIO Utility by Wiring Pi</a> and Gadgetoid and RogueHAL13&#39;s <a class="jive-link-external-small" href="https://pinout.xyz/" rel="nofollow ugc noopener" target="_blank">pinout.xyz</a> - be careful not to be caught out though, as the GPIO pins are also referenced as &#39;BCM&#39; pins (meaning Broadcom) to help reduce confusion from the physical pins.</p><p style="margin:0;padding:0px;">&nbsp;</p><p style="margin:0;">Changing the default configuration is considered advanced, and isn&#39;t for the faint of heart, so enjoy going down the rabbit hole for your project!</p><p style="margin:0;padding:0px;">&nbsp;</p><p style="margin:0;"><strong>Want to know more?</strong></p><p style="margin:0;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4354/meet-the-new-raspberry-pi-4-model-b---element14-presents">Meet The New Raspberry Pi 4 Model B - element14 Presents</a></p><p style="margin:0;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4320/raspberry-pi-4-model-b---technical-specifications">Raspberry Pi 4 Model B - Technical Specifications</a></p><p style="margin:0;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4318/raspberry-pi-4-model-b-frequently-asked-questions-faq"> Raspberry Pi 4 Model B Frequently Asked Questions (FAQ)</a></p><p style="margin:0;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4319/benchmarking-the-raspberry-pi-4-model-b">Benchmarking the Raspberry Pi 4 Model B</a></p><p style="margin:0;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4348/which-accessories-are-compatible-with-the-new-raspberry-pi-4-model-b">Which accessories are compatible with the New Raspberry Pi 4 Model B?</a></p><p style="margin:0;"><a class="jive-link-wiki-small" href="#">Raspberry Pi 4 Model B Default GPIO Pinout with PoE Header</a></p><p style="margin:0;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4329/do-you-know-your-pi-from-pie-raspberry-pi-quiz">Do You Know Your Pi from Pie? Raspberry Pi Quiz!</a></p><p style="margin:0;"><a class="jive-link-wiki-small" href="/products/raspberry-pi/w/documents/4322/eben-upton-talks-about-the-new-raspberry-pi-4-model-b">Eben Upton talks about the new Raspberry Pi 4 Model B</a></p><p style="margin:0;padding:0px;">&nbsp;</p><p style="margin:0;"><strong>Want to buy the new Raspberry Pi 4 Model B?</strong></p><p style="margin:0;padding:0px;">&nbsp;</p><table border="1" class="jiveBorder mce-item-table" style="border:1px solid #C6C6C6;"><thead><tr><th style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;color:#505050;background-color:#f2f2f2;text-align:left;">Product Name</th><th style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;color:#505050;background-color:#f2f2f2;text-align:left;">Manufacturer</th><th style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;color:#505050;background-color:#f2f2f2;text-align:left;"></th></tr></thead><tbody><tr><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;">RASPBERRY PI 4 MODEL B, 1GB</td><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;">Raspberry Pi</td><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;"><span><span class="e14-init-shown e14-product-link-buynow" id="addProduct-dtgJ2aFi-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=3051885~1&amp;nsku=02AH3161~1&amp;COM=noscript" target="_blank"><span class="pf-widget-map pf-productlink-cart-icon"></span></a><a class="jive-link-product pf-embedded-product-link" href="https://www.element14.com/community/view-product.jspa?fsku=3051885~1&amp;nsku=02AH3161~1&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-dtgJ2aFi-unlinked">Buy Now</span></span></td></tr><tr><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;">RASPBERRY PI 4 MODEL B, 2GB</td><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;">Raspberry Pi</td><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;"><span><span class="e14-init-shown e14-product-link-buynow" id="addProduct-E3z2LmZN-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=3051886~1&amp;nsku=02AH3162~1&amp;COM=noscript" target="_blank"><span class="pf-widget-map pf-productlink-cart-icon"></span></a><a class="jive-link-product pf-embedded-product-link" href="https://www.element14.com/community/view-product.jspa?fsku=3051886~1&amp;nsku=02AH3162~1&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-E3z2LmZN-unlinked">Buy Now</span></span></td></tr><tr><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;">RASPBERRY PI 4 MODEL B, 4GB</td><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;">Raspberry Pi</td><td style="border:1px solid black;border:1px solid #C6C6C6;padding:6px;"><span><span class="e14-init-shown e14-product-link-buynow" id="addProduct-XUi6GpCB-linked" style="white-space:nowrap;"><a class="jive-link-product-addtolist" href="https://www.element14.com/community/view-product.jspa?fsku=3051887~1&amp;nsku=02AH3164~1&amp;COM=noscript" target="_blank"><span class="pf-widget-map pf-productlink-cart-icon"></span></a><a class="jive-link-product pf-embedded-product-link" href="https://www.element14.com/community/view-product.jspa?fsku=3051887~1&amp;nsku=02AH3164~1&amp;COM=noscript" target="_blank">Buy Now</a></span><span class="e14-init-hidden" id="addProduct-XUi6GpCB-unlinked">Buy Now</span></span></td></tr></tbody></table> <div class="migration-injected-attachments"><div style="font-weight:bold;margin:15px 0 5px 0;">Attachments:</div><div></div><table style="border:0;"><tbody><tr><td width="160"><span class="_se_attachment" id="attid_https://www.element14.com/community/api/core/v3/attachments/283517"><a href="https://community.element14.com/cfs-file/__key/communityserver-wikis-components-files/00-00-00-01-69/BCM2835_2D00_ARM_2D00_Peripherals.pdf">community.element14.com/.../BCM2835_2D00_ARM_2D00_Peripherals.pdf</a></span></td><td><span style="font-size:80%;">BCM2835-ARM-Peripherals.pdf</span></td></tr></tbody></table></div><div style="clear:both;"></div> <div style="font-size: 90%;">Tags: raspberry pi 4 general purpose input output, raspberry pi 4 gpio pinout, raspberry pi 4</div>