https://community.element14.com/products/raspberry-pi/Join the Raspberry Pi Community, learn about the Pi 5 and the family of the single board computeren-USTelligent Community 12https://community.element14.com/products/raspberry-pi/b/blog/posts/ia-generador-neural-network-library-for-microcontrollerSat, 13 Jun 2026 20:53:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:e7f8d62d-802e-40be-acce-b06e06eb8e5brbasulto53Hello, please let me know what you think of this AI web application for improvement. It allows you to generate trained neural network models for use with microcontrollers like Raspberry Pi Pico, ESP32, etc. These models don't require an internet connection and are trained by loading a CSV file. It dynamically maps inputs and outputs and has two hidden layers whose architecture can be configured. The link is: https://traindeep.ai thankshttps://community.element14.com/products/raspberry-pi/raspberrypi_projects/b/blog/posts/e-z-usb-to-i2c-adapter-and-uart-bridgeTue, 09 Jun 2026 15:49:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:fcae1edb-68a0-45fd-a631-fcf74bed2167shabazThis E-Z USB to I2C and UART Bridge adapter is a bit of a niche project! I doubt many people may have the same precise needs as me, but I figured I’d document it, in case anyone comes across a use one day. In brief, this project converts a Pi Pico into a USB-UART adapter, as well as a USB-I2C adapter. This project would be useful if you wish to test an I2C peripheral, or need UART comms, or both. I used it with a device-under-test that had I2C input, and that output UART data. By using the adapter described in this blog post, I was able to wrap a complete test harness around the DUT, and run test cases from my PC. (Note: Not relevant to this blog post, but my DUT [which I will document elsewhere] happened to be an I2C-to-UART expander – that’s a device for attaching to a microcontroller, to give it an extra UART interface via I2C, since some microcontrollers only come with one or two built-in UARTs). If you wish to use the E-Z Adapter, the steps to build it are really simple, since it’s just an off-the-shelf Pi Pico with no additional bits. You could optionally solder I2C pull-up resistors if you don’t have that as part of the DUT. The photo shows the E-Z adapter in use; I soldered I2C pull-up resistors on top of the Pi Pico, to pin 36 (which is a regulated 3.3V output from the Pico). Here’s the connection diagram: The Pi Pico can be programmed by downloading the .uf2 firmware file , and then holding down the BOOTSEL button on the Pi Pico while inserting the USB cable into the PC, and then drag-and-drop the firmware file onto the storage drive letter that appears. It will program in seconds, and start running. In Windows Device Manager, you should see two USB Serial ports appear. One is a normal USB-UART, and the other is for the I2C adapter function. To use the I2C adapter function, you could either type commands over a serial terminal, or you could use Python or any other programming language on the PC (very useful for creating scripts to test a DUT). The I2C adapter function is documented here (an earlier project). By the way, general-purpose input/output is also supported (so you can control relays and so on from the PC too), that's documented at the earlier project link as well. Thanks for reading! Links E-Z USB to I2C Adapter and UART Bridge GitHub repository (+) USB-to-I2C with a Pi Pico: Building an Easy I2C Adapter for PC control of I2C Devices - element14 Communitypythoni2cpicouartrpi-beginnerhttps://community.element14.com/products/raspberry-pi/f/forum/57009/raspberry-pi-4-gpio-leakage-voltage-1-2v-when-low-on-relay-module/235974Thu, 04 Jun 2026 20:44:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:15e8546b-3c4c-4a7b-b506-bc13965260d8geralds[quote userid="522264" url="~/products/raspberry-pi/f/forum/57009/raspberry-pi-4-gpio-leakage-voltage-1-2v-when-low-on-relay-module"] Wenn der GPIO-Pin HOCH ist , messe ich genau 3,3 V auf der Leitung, was korrekt ist. Wenn der GPIO-Pin auf LOW statt 0V eingestellt ist, sehe ich eine konstante 1,2V-Leck -/Schwimmenspannung am Multimeter. [/quote] Look here: https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#gpio-pads-control most of the port pin are tri-stated pins. Yes, it means that the pin can have 1.2V - the middle of the supply voltage as well as meaning this state is in "high-Z". This is NOT a "leakage". Z = Impedance in (k)Ohm. This function is a very important function if you want to use that pins with different jobs. Such port can be driven in: "switched on" (sending high to the output), "h-Z" (the software let the port "swimming"), "switched-off (sending low to the output) Gerald ---https://community.element14.com/products/raspberry-pi/f/forum/57009/raspberry-pi-4-gpio-leakage-voltage-1-2v-when-low-on-relay-module/235970Thu, 04 Jun 2026 19:53:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:f6be31ce-fc01-4465-994f-3c9adfe630d2DABThe RPI does some interesting things with the GPIO pins. You may have to set up some external termination resistors to get the right behavior. As I recall, there are some internal options you can set to the output configuration to use internal termination.https://community.element14.com/products/raspberry-pi/f/forum/57009/raspberry-pi-4-gpio-leakage-voltage-1-2v-when-low-on-relay-module/235967Thu, 04 Jun 2026 19:22:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:cde3d731-075a-4a05-bbf5-505bff194cddrobogaryHi emreey.y. Please reference my spring clean 2026 project: The WrongCo Garden Guardian (a.k.a. Rube Frankenstein). I have schematics showing a raspberry pi pico 3v outputs driving 3v relay modules and 3v mosfet boards. The modules then drive 12v circuits. These output driver boards could just as easy pilot 24v devices.https://community.element14.com/products/raspberry-pi/f/forum/57009/raspberry-pi-4-gpio-leakage-voltage-1-2v-when-low-on-relay-module/235963Thu, 04 Jun 2026 14:22:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:3c8a4dfa-579b-4df6-b484-b95f1e7ecca8dougwYou need to supply a schematic of the connections. Typically a Pi output pin cannot drive a relay coil because the voltage is too high, the current is too high and the inductive flyback is too high. It sounds like you are trying to pull down a coil pin of a coil whose other pin is connected to 3.3V. The I/O pin cannot sink enough current to pull that pin to ground. A transistor would help, but the coil may need a higher voltage and it would definitely need a snubber diode.https://community.element14.com/products/raspberry-pi/f/forum/57009/raspberry-pi-4-gpio-leakage-voltage-1-2v-when-low-on-relay-module/235953Wed, 03 Jun 2026 23:47:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:86aee25a-963a-4a18-ae99-7e0b6a050b53geraldsHello, 1. Do NOT connect a 24V relay directly to an output of the Raspberry Pi. This will damage the Pi's port. 2. You need an external driver transistor to control the 24V relay. Alternatively, you can use an optocoupler such as the PC817. The GND - normally - is the base of each switched schematic, special circuits can have other base voltages. A relay has three operating states: a) Turn-on voltage: This is the minimum voltage at which the relay turns on. b) Hold voltage: This voltage is slightly lower than the turn-on voltage and can be even lower before the relay turns off. This voltage can help save power. c) Turn-off voltage: This voltage is so low that the relay turns off. A voltage may still be applied, but it will no longer be held. You can find the voltage states of your 24V relay in its datasheet. 3. You can use an NPN transistor, for example. BC547 or BC546 or similar switching transistors (emitter to GND, collector to the relay) – the relay is connected to the supply voltage (+24 V). 4. Don't forget the diode, e.g., 1N4007, in parallel with the relay coil; cathode to the positive supply voltage, anode to the switching transistor collector. Alternatively: There is another option where the relay is connected to ground (GND) and can be switched with a PNP transistor. However, this circuit is somewhat more complex and requires a few more components.https://community.element14.com/products/raspberry-pi/f/forum/57009/raspberry-pi-4-gpio-leakage-voltage-1-2v-when-low-on-relay-module/235952Wed, 03 Jun 2026 22:55:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:4180ff1a-509d-4fc2-a743-879d168cb3e0colporteurIf the Pi is going to power and external device they both have to have a common ground reference. 3.3V on the Pi is referenced to its own ground. If the Pi's ground is not the same as the equipment ground, you will have issues. Let's just say I have had issues until I create the common ground.https://community.element14.com/products/raspberry-pi/f/forum/57009/raspberry-pi-4-gpio-leakage-voltage-1-2v-when-low-on-relay-module/235949Wed, 03 Jun 2026 22:21:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:a392fa9d-03a8-4817-ad03-49dbae351b7crobogaryreference the rpi common to the panel internal structures common and the rpi power input common. Make everyone's common , in common.https://community.element14.com/products/raspberry-pi/f/forum/57009/raspberry-pi-4-gpio-leakage-voltage-1-2v-when-low-on-relay-module/235947Wed, 03 Jun 2026 21:34:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:37f5e607-88d1-49f5-94dc-b08b501e85a7shabazHi, You may need to sketch a diagram, and attach a photo showing your setup, and links to the relay module and any other bits you're using. Right now it's very unclear what your precise set-up is.https://community.element14.com/products/raspberry-pi/f/forum/57009/raspberry-pi-4-gpio-leakage-voltage-1-2v-when-low-on-relay-moduleWed, 03 Jun 2026 20:33:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:9204c7c4-44b1-40ed-b093-c43908e9a930emreeyyHi everyone, I am using a Raspberry Pi 4 Model B to control industrial 24V relay modules. However, I am not using an external 24V power supply; instead, I am routing the Pi's own 3.3V pin to the common power rail of the relays to use them as simple mechanical switches for 3.3V signals. I have wired the Raspberry Pi GPIO pins directly to the relay signal inputs via a simple terminal block breakout board (no transistors or optocouplers are used yet). The Problem: When the GPIO pin is ⁠HIGH⁠ , I read exactly 3.3V on the line, which is correct. When the GPIO pin is set to ⁠LOW⁠ , instead of 0V, I see a constant 1.2V leakage/floating voltage on the multimeter. There is currently no common ground (GND) connection between the Raspberry Pi and the panel's internal structure. I suspect this 1.2V is due to a floating ground issue or feedback leakage through the relay's internal coil/status LED. What is the best way to eliminate this 1.2V leakage and get a clean 0V when the pin is LOW? Should I use an optocoupler module (like PC817) or a transistor driver? Thanks in advance!https://community.element14.com/products/raspberry-pi/f/forum/56946/moode-audio-and-raspberry-pi-5Sun, 17 May 2026 00:32:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:6a6b4b00-0076-470e-9d49-1877b2d038f2Mark87Hi there! I’m experiencing the same issues with moOde Audio performance when using the built‑in Wi‑Fi server. The problem occurs very frequently—after about two months of running optimally, the system starts freezing repeatedly. When this happens, I can’t stop playback or perform any other actions. My setup is a Raspberry Pi 5 (8GB) running moOde Audio Player 10.2.0 (64-bit Trixie) and a official power supply For a Raspberry Pi 5 . Any suggestion about how overcome this issue?helpmeraspberry_pi