When using a sensor, usually the ID is already set, and you have to find it in the datasheet. Note that it’s quite different from when you use I2C to read data from a sensor. So here on Raspberry Pi we have to use the same ID to find the Arduino device on the I2C bus. You can find the complete header file on GitHub. Here we include the WiringPiI2C header, which is part of the WiringPi library. Let’s write the most basic program to use Arduino as an I2C slave. Open this file (with sudo), find the line #dtparam=i2c_arm=on, and remove the leading ‘#’ to uncomment it.Īfter that, reboot your Pi, and I2C will be activated as long as you don’t comment the I2C line again in the config file. To activate it, search for the “/boot/config.txt” file. If you haven’t used I2C on your Raspberry Pi yet, it probably means that the I2C communication is not activated. To learn more about gpio headers: Raspberry Pi pinout guide | Arduino Uno pinout guide. To make it simple, in this scenario the Raspberry Pi will impose 3.3V, which is not a problem for the Arduino pins. If the Raspberry Pi is configured as a master and the Arduino as a slave on the I2C bus, then you can connect the SDA and SCL pins directly. But in this specific case we can avoid using one. Usually you’d have to use a level converter between 3.3V and 5V. You should really pay attention when you connect 2 pins between those boards. Important note: the Raspberry Pi 4 (and earlier) is running under 3.3V, and the Arduino Uno is running under 5V!
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