Push button with NUCLEO-F401RE

Wiring for the Push button on the NUCLEO-F401RE (STM32F401RE, 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	NUCLEO-F401RE pin	Notes
1	Output from the part	D2 (PA10)	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(PA10, INPUT_PULLUP);  // pressed = LOW
}

void loop() {
  Serial.println(digitalRead(PA10) == LOW ? "pressed" : "released");
  delay(100);
}

Arduino board: STMicroelectronics:stm32:Nucleo_64:pnum=NUCLEO_F401RE. Plug the USB cable into the mini-USB port on the ST-LINK end. No button press is needed.

Questions

Which NUCLEO-F401RE pins do I use for the Push button?

1 → D2 (PA10), 2 → GND.

Does the Push button work with the NUCLEO-F401RE at 3.3 V?

Yes: the Push button runs at 3.3 V and the NUCLEO-F401RE 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 NUCLEO-F401RE pinout · Push button: all pins and data

The Push button on other boards

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