TM1637 with Arduino Nano

Wiring for the TM1637 4-digit 7-segment display 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

TM1637 pin	Role	Arduino Nano pin	Notes
CLK	Input to the part	D2 (PD2)	Clock (not I2C, not SPI)
DIO	Input to the part	D3 (PD3)	Data (not I2C)
GND	Ground	GND
5V	Power	5V	Works at 3.3 V or 5 V

Check before you power it on

Supply: 5 V from the 5V pin.

Test code (Arduino)

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

TM1637Display display(2, 3);  // CLK, DIO

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

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

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 TM1637?

CLK → D2 (PD2), DIO → D3 (PD3), GND → GND, 5V → 5V.

Does the TM1637 work with the Arduino Nano at 5 V?

Yes: the TM1637 runs at 3.3-5 V and the Arduino Nano uses 5 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 Arduino Nano pinout · TM1637 4-digit 7-segment display: all pins and data

The TM1637 on other boards

ESP32 DevKit Arduino Mega 2560 R3 Arduino Uno R3 WeAct Black Pill STM32F411CE ESP32-C3-DevKitM-1 ESP32-S3-DevKitC-1 Nordic nRF52840 DK NUCLEO-F401RE Raspberry Pi Pico 2 Raspberry Pi Pico W Raspberry Pi Pico Teensy 4.1

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