User inputs allow you to have pins that can be read by the gcode M66 command
Only digital inputs are supported currently.
digital0_pin through digital7_pin can be defined.
user_inputs:
analog0_pin: NO_PIN
analog1_pin: NO_PIN
analog2_pin: NO_PIN
analog3_pin: NO_PIN
digital0_pin: gpio.12:low
digital1_pin: NO_PIN
digital2_pin: NO_PIN
digital3_pin: NO_PIN
digital4_pin: NO_PIN
digital5_pin: NO_PIN
digital6_pin: NO_PIN
digital7_pin: NO_PIN