Push button with Raspberry Pi Pico

Wiring for the Push button on the Raspberry Pi Pico (RP2040, 3.3 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	Raspberry Pi Pico pin	Notes
1	Output from the part	GP15	To a GPIO; use INPUT_PULLUP in code
2	Ground	GND

Check before you power it on

Test code (Arduino)

void setup() {
  Serial.begin(115200);
  pinMode(15, INPUT_PULLUP);  // pressed = LOW
}

void loop() {
  Serial.println(digitalRead(15) == LOW ? "pressed" : "released");
  delay(100);
}

Arduino board: rp2040:rp2040:rpipico. If the board is not found, hold the BOOTSEL button while plugging in the USB cable.

Questions

Which Raspberry Pi Pico pins do I use for the Push button?

1 → GP15, 2 → GND.

Does the Push button work with the Raspberry Pi Pico at 3.3 V?

Yes: the Push button runs at 3.3 V and the Raspberry Pi Pico uses 3.3 V signals, so no level shifting is needed.

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

Download BoardPilot

Full Raspberry Pi Pico pinout · Push button: all pins and data

The Push button on other boards

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