Arduino and QYF-TM1638 module example

When I was browsing various web sites to see what electronic components to buy one day I noticed some interesting little kits comprising of switches, LEDs and a couple of 4 digit seven segment displays saw I decided to purchase one, the first thing I noticed was at the heart of the module was a chip called a TM1638, never heard of it. A quick search dug up links to the datasheet (link supplied underneath in the links section) and an arduino library (in the code section). That makes life easier.

The module I bought had 5 connections.

VCC – 5v from Arduino
Gnd – GND from Arduino
STB – strobe pin, an output from your Arduino
CLK – clock pin, an output from your Arduino
DIO –  data pin, another ouput from your Arduino

Layout

Code

You can get a library to make development easier from https://github.com/rjbatista/tm1638-library

This is a test example

[codesyntax lang=”cpp”]

#include <TM1638.h>
#include <TM1638QYF.h>

TM1638QYF module(8,9,10);
word mode;

unsigned long startTime;

void setup() {
  startTime = millis();

  module.setupDisplay(true, 7);
  mode = 0;
}

void update(TM1638QYF* module, word* mode) {
  word buttons = module->getButtons();
  unsigned long runningSecs = (millis() - startTime) / 1000;

  // button pressed - change mode
  if (buttons != 0) {
    *mode = buttons >> 1;

    if (*mode < 128) {
      module->clearDisplay();
      delay(100);
    }
  }

  switch (*mode) {
    case 0:
      module->setDisplayToDecNumber(runningSecs, 1 << 6);
      break;
    case 1:
      module->setDisplayToDecNumber(runningSecs, 1 << 5, false);
      break;
    case 2:
      module->setDisplayToHexNumber(runningSecs, 1 << 4);
      break;
    case 4:
      module->setDisplayToHexNumber(runningSecs, 1 << 3, false);
      break;
    case 8:
      module->setDisplayToBinNumber(runningSecs, 1 << 2);
      break;
    case 16:
      char s[9];
      sprintf(s, "Secs %03d", runningSecs % 999);
      module->setDisplayToString(s, 1 << 1);
      break;
    case 32:
      if (runningSecs % 2 == 0) {
        module->setDisplayToString("TM1638QY", 1);
      } else {
        module->setDisplayToString(String("LIBRARY "), 1);
      }

      break;
    case 64:
      module->setDisplayToError();
      break;
    case 128:
      module->setDisplayToDecNumber(*mode, 0);
      break;
    case 256:
      module->setDisplayToString("ABCDE", 1 << (runningSecs % 8));
      break;
    default:
      module->setDisplayToBinNumber(buttons & 0xF, buttons >> 8);
  }
}

void loop() {
  update(&module, &mode);
}

[/codesyntax]

 

Links

TM1638 English datasheet
8 Bits LED Digital tube Module Keyboard Scan and Display Module TM1638 MCU