Once you have connected an i2C device, turn on your raspberry Pi and let it boot up. Log in and run the following command
i2cdetect -y 1
You will presented with a map like the following:
0 1 2 3 4 5 6 7 8 9 a b c d e f 00: -- -- -- -- -- -- -- -- -- -- -- -- -- 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 20: -- -- -- 23 -- -- -- -- -- -- -- -- -- -- -- -- 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 70: -- -- -- -- -- -- -- --
This polls bus 1 of the i2c system, which is the one the model 3 uses.
Devices connected using i2c will be listed in this screen. In this case a device is connected at address 23.
If you do not see a connected device, it may not be getting enough power, or your wiring may not be correct. Please check and retry this step.
