TM1637 with Teensy 4.1

Wiring for the TM1637 4-digit 7-segment display on the Teensy 4.1 (MIMXRT1062DVJ6B, 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	Teensy 4.1 pin	Notes
CLK	Input to the part	2 (GPIO_EMC_04)	Clock (not I2C, not SPI)
DIO	Input to the part	3 (GPIO_EMC_05)	Data (not I2C)
GND	Ground	G
5V	Power	3V	Works at 3.3 V or 5 V

Check before you power it on

Supply: 3.3 V from the 3V 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: teensy:avr:teensy41. Press the white program button once if the upload waits for the board.

Questions

Which Teensy 4.1 pins do I use for the TM1637?

CLK → 2 (GPIO_EMC_04), DIO → 3 (GPIO_EMC_05), GND → G, 5V → 3V.

Does the TM1637 work with the Teensy 4.1 at 3.3 V?

Yes: the TM1637 runs at 3.3-5 V and the Teensy 4.1 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 Teensy 4.1 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 NUCLEO-F401RE Raspberry Pi Pico 2 Raspberry Pi Pico W Raspberry Pi Pico

Other parts on the Teensy 4.1

BME280 BMP280 DHT22 DHT11 HC-SR04 SSD1306 OLED MPU6050 DS18B20 WS2812B LED strip SG90 servo Relay module HC-SR501 PIR LCD 1602 I2C INA219 VL53L0X BH1750 MAX30102 RC522 RFID NEO-6M GPS Capacitive soil moisture sensor ADS1115 28BYJ-48 stepper L298N Potentiometer Push button LED Joystick module SD card module AHT20