TM1637 with NUCLEO-F401RE

Wiring for the TM1637 4-digit 7-segment display 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

TM1637 pin	Role	NUCLEO-F401RE pin	Notes
CLK	Input to the part	D2 (PA10)	Clock (not I2C, not SPI)
DIO	Input to the part	D4 (PB5)	Data (not I2C)
GND	Ground	GND
5V	Power	3V3	Works at 3.3 V or 5 V

Check before you power it on

Supply: 3.3 V from the 3V3 pin.

Test code (Arduino)

// Library: TM1637 (Avishay Orpaz)
#include <TM1637Display.h>

TM1637Display display(PA10, PB5);  // CLK, DIO

void setup() {
  display.setBrightness(4);
}

void loop() {
  display.showNumberDec(millis() / 1000);  // seconds since start
  delay(200);
}

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 TM1637?

CLK → D2 (PA10), DIO → D4 (PB5), GND → GND, 5V → 3V3.

Does the TM1637 work with the NUCLEO-F401RE at 3.3 V?

Yes: the TM1637 runs at 3.3-5 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 · TM1637 4-digit 7-segment display: all pins and data

The TM1637 on other boards

ESP32 DevKit Arduino Mega 2560 R3 Arduino Nano Arduino Uno R3 WeAct Black Pill STM32F411CE ESP32-C3-DevKitM-1 ESP32-S3-DevKitC-1 Nordic nRF52840 DK Raspberry Pi Pico 2 Raspberry Pi Pico W Raspberry Pi Pico Teensy 4.1

Other parts on the NUCLEO-F401RE

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