fordSpeed - a nixie tube speedometer for a Ford Model A. Interprets bytes from serial as raw unsigned integer values. Creates the proper binary pattern and shifts it out to a HV5622 32bit high voltage shift register, which drives three Nixie Tubes This works because the nixies are connected in a way that allows us to shift a bit n-times per digit (with value n), to light up the corresponding value of that digit. Each tube uses 10 bits, the HV5622 has 32.. so we've wasted two bits... sorry. Copyleft 2022 ~Robotto