import machine

sdaPIN = machine.Pin(21)
sclPIN = machine.Pin(22)
i2c = machine.I2C(sda=sdaPIN, scl=sclPIN, freq=10000)
devices = i2c.scan()

if len(devices) == 0:
    print("No I2C devices found!")
else:
    print('I2C devices found:', len(devices))
    for device in devices:
        print("At address:", hex(device))