ESP32 and TM1637 7 segment display example

A common display module that you can buy on the internet contain the Tm1638 driver chip, I was interested in this one which is the TM1637 which appears to be a more basic version which can only control a display, the TM1638 can also control LED’s, buttons and two displays at the same time.

This is a common anode 4-digit tube display module which uses the TM1637 driver chip; Only 2 connections are required to control the 4-digit 8-segment displays

Here is the module

TM1637
TM1637

Features of the module

  • Display common anode for the four red LED
  • Powered supply by 3.3V/5V
  • Four common anode tube display module is driven by IC TM1637
  • Can be used for Arduino devices, two signal lines can make the MCU control 4 8 digital tube. Digital tube 8 segment is adjustable

Here is how to hook the module up, the good news is this worked with my LOLIN32 and 3.3v

Schematic

esp32 and tm1637 display
esp32 and tm1637 display

 

Code

There is a library for this IC, you can get it from https://github.com/avishorp/TM1637 , as usual there is a built in example but here is a simple sketch


#include <TM1637Display.h>

const int CLK = A13; //Set the CLK pin connection to the display
const int DIO = A12; //Set the DIO pin connection to the display

int numCounter = 0;

TM1637Display display(CLK, DIO); //set up the 4-Digit Display.

void setup()
{
display.setBrightness(0x0a); //set the diplay to maximum brightness
}

void loop()
{
for(numCounter = 0; numCounter < 1000; numCounter++) //Iterate numCounter
{
display.showNumberDec(numCounter); //Display the numCounter value;
delay(1000);
}
}

Links

TM1637 Red Digital Tube LED Display Module & Clock for Arduino LED

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