The Arduino Mega 2560 is a microcontroller board based on the ATmega2560. It has 54 digital input/output pins (of which 14 can be used as PWM outputs), 16 analog inputs and 4 UARTs (hardware serial ports).
Mono linear potentiometers with sunken axel measuring 6 mm, for an international type dial with 18 indentations, twist attachment and post for CI and 10K Ohm.