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))