I2C block Scanner.

Download to Arduino board. Connect the module via the I2C bus!

Open the port monitor: Device address 0x40.

Using I2C, you can connect many different useful modules to Arduino, including sensors,
displays, ADCs and even other Arduino boards. The bus is addressable, so that each connected
the device has its own address in the range from 8 to 127.

Sample program:

Download example: file.ardublock | Open Online ArduBlock

Video: