Push button with Arduino Nano

Wiring for the Push button on the Arduino Nano (ATmega328P, 5 V logic), chosen with the same pin rules BoardPilot uses: default buses first, and no pins that are used for flash, USB, the debugger or booting.

Wiring

Push button pin	Role	Arduino Nano pin	Notes
1	Output from the part	D2 (PD2)	To a GPIO; use INPUT_PULLUP in code
2	Ground	GND

Check before you power it on

The Push button is a 3.3 V part and the Arduino Nano uses 5 V signals. Power it from 3.3 V and put a level shifter on the signal wires, or buy a 5 V version of the module.

Test code (Arduino)

void setup() {
  Serial.begin(115200);
  pinMode(2, INPUT_PULLUP);  // pressed = LOW
}

void loop() {
  Serial.println(digitalRead(2) == LOW ? "pressed" : "released");
  delay(100);
}

Arduino board: arduino:avr:nano. Clones with the old bootloader upload at 57600 baud: choose “ATmega328P (Old Bootloader)” if uploads fail.

Questions

Which Arduino Nano pins do I use for the Push button?

1 → D2 (PD2), 2 → GND.

Does the Push button work with the Arduino Nano at 5 V?

The Push button is a 3.3 V part and the Arduino Nano uses 5 V signals. Power it from 3.3 V and put a level shifter on the signal wires, or buy a 5 V version of the module.

BoardPilot checks this wiring in 3D as you build it, and finds crossed or missing wires on the real board.

Download BoardPilot

Full Arduino Nano pinout · Push button: all pins and data

The Push button on other boards

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