# *** References ***
# (1) Using I2C devices with Raspberry PI Pico and MicroPython - peppe, 2021may30
#       https://peppe8o.com/using-i2c-devices-with-raspberry-pi-pico-and-micropython/
# (2) Raspberry Pi Pico (RP2040) I2C Example with MicroPython - Digikey 
#       https://www.digikey.hk/en/maker/projects/raspberry-pi-pico-rp2040-i2c-example-with-micropython-and-cc/47d0c922b79342779cdbd4b37b7eb7e2/
# (3) MicroPython I2C - Micropython.org
#       https://docs.micropython.org/en/latest/library/machine.I2C.html
# (4) Pico Hardware I2C bus - Micropython.org
#     https://docs.micropython.org/en/latest/rp2/quickref.html