So you will need a library that does allow multiple I 2C objects. The Wire library doesn’t cater for multiple I 2C busses, you can only call one instance of it. The Wire Library that comes with the Arduino IDE only allows you to use the pins on the Arduino that are meant for I 2C: Board The only solution is to create multiple I2C busses. So what can we do to use 2 or more I 2C modules that share 0ne address? The Arduino does have one hardware I 2C port, except for the Arduino Due, that has 2. The Adafruit I2C address list shows the I2C addresses of many modules. Even when the chip itself has a possibility to select more than one I2C address, the module does not always implement that (Various PCF8591 modules for instance) Many I 2C modules can in fact be set for another address, usually through some address jumpers, but that is not always possible.

With 128 adresses available you would think you are not going to run into an address conflict, meaning you want to use 2 modules that have the same I2C address, but you’d be surprised. I 2C is a handy protocol to control plenty of chips/sensors/actuators with only 2 pins.

Arduino wire library for raspberry pi