LED with NUCLEO-F401RE

Wiring for the LED with 220 Ω resistor 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

LED pin	Role	NUCLEO-F401RE pin	Notes
A	Input to the part	D2 (PA10)	Anode (long leg), through the resistor to a GPIO
K	Ground	GND	Cathode (short leg, flat side)

Check before you power it on

Test code (Arduino)

void setup() {
  pinMode(PA10, OUTPUT);  // A on D2
}

void loop() {
  digitalWrite(PA10, HIGH);
  delay(500);
  digitalWrite(PA10, LOW);
  delay(500);
}

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 LED?

A → D2 (PA10), K → GND.

Does the LED work with the NUCLEO-F401RE at 3.3 V?

Yes: the LED 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 · LED with 220 Ω resistor: all pins and data

The LED on other boards

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