How many Devices can you Connect to the I2C Bus?"You have a 7-bit address. That means you can address up to 127 slaves." "The number of devices connected to the bus is only limited by the total allowed bus capacitance of 400 pF.""Short answer: it depends!"
It's fairly straightforward. Check the wiring documentation under "Wiring (TWI)" for the master and slave sender and receiver examples.