I2C Rpi and arduino

Ive been searching for a way to comunicate more directly than the usb betwen the Rpi and arduino and I saw that the P5 has an I2C pins and I was wondering if its possible to use those pins to comunicate the arduino and the Rpi, if so can anyone tell me where to go to learn how to use the two together.

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Former Member over 12 years ago

I've connected a 44780 based LCD to the Pi via I2C but I haven't tried talking to the Arduino using this interface. Have you gotten I2C to work on the Pi? There are a lot of useful links describing how to do this: http://www.skpang.co.uk/blog/archives/575 and http://learn.adafruit.com/adafruits-raspberry-pi-lesson-4-gpio-setup/configuring-i2c for example. Since I'm using a MCP23017 based I2C I followed the two programming links on this page http://mypishop.com/Protect%20Your%20Pi%20!.html

This link seems to have some useful info when you're ready to connect the Arduino to the Pi.
http://blog.oscarliang.net/raspberry-pi-arduino-connected-i2c/

This link notes that you need to pay careful attention to the differing voltage levels.
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Former Member over 12 years ago

I've connected a 44780 based LCD to the Pi via I2C but I haven't tried talking to the Arduino using this interface. Have you gotten I2C to work on the Pi? There are a lot of useful links describing how to do this: http://www.skpang.co.uk/blog/archives/575 and http://learn.adafruit.com/adafruits-raspberry-pi-lesson-4-gpio-setup/configuring-i2c for example. Since I'm using a MCP23017 based I2C I followed the two programming links on this page http://mypishop.com/Protect%20Your%20Pi%20!.html

This link seems to have some useful info when you're ready to connect the Arduino to the Pi.
http://blog.oscarliang.net/raspberry-pi-arduino-connected-i2c/

This link notes that you need to pay careful attention to the differing voltage levels.
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