Instead of a software solution, it is also possible to use an I 2C port expander. These would need some modification to make them work with another I2C library. That is the fact that many existing libraries for I 2C peripherals make direct calls to the “Wire” library. Using those software libraries is a quick and easy way to set up multiple I 2C busses, but there is one major drawback. Some more multiple bus Software I2C libraries can be found here. Software_I2C on GitHub might be akin to this one from Seeedstudio, but I did not make a full comparison. It needs another library called AsyncDelay. SoftWire allows any pins of the Arduino to be used. SoftI2CMaster is a lean I2C implementation. 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.
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