User inputs allow you to have pins that can be read by the gcode M66 command
digital0_pin through digital7_pin can be defined.
NO_PINThe pin can be read by the M66 command (M66 P<digital input>).
analog0_pin through analog3_pin can be defined.
NO_PINThe pin can be read by the M66 command (M66 E<analog input>).
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