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ARDUINO

ARDUINO NANO INTERFACING WITH TM1637 4 DIGIT 7 SEGMENT DISPLAY

TM1637 is a chip for driving 7-segment displays. by Tushar Gandhi

Key Features

  • Use either raw segment values or decimal numbers (with and without leading zero)
  • Set either the whole display or any digit independently
  • Control the brightness
  • Pure software implementation

Hardware Connection

Hardware and Purchase Link

The display module has 4 pins:

TM1637 – 4 DIGIT 7 SEGMEN

<ul><li><strong>VCC - </strong>+5VDC</li><li><strong> GND</strong>&nbsp;- GND  </li><li> <strong>CLK</strong>&nbsp;- Clock; connect to any digital pin on the Arduino </li><li> <strong>DIO</strong>&nbsp;- Data I/O; connect to any digital pin on the Arduino </li></ul>

ARDUINO NANO

Download

Browse the code in GitHub, or grab the latest release directly.

OR

Open Arduino IDE -> Sketch -> Include Library -> Manage Libraries

In search menu type TM1637.

It will display all the module related to TM1637.

Select  any one and install it.

Now open new New program.

File -> Esamples -> TM1637 -> TM1637 Test

Select Board Arduino nano. (Also we can select Arduino Uno if we are using it.)

Now upload it.

It will display the numbers, some characters and sign.

#include <Arduino.h>
#include <TM1637Display.h>
// Module connection pins (Digital Pins)
#define CLK 2
#define DIO 3
// The amount of time (in milliseconds) between tests
#define TEST_DELAY   2000
const uint8_t SEG_DONE[] = {
	SEG_B | SEG_C | SEG_D | SEG_E | SEG_G,           // d
	SEG_A | SEG_B | SEG_C | SEG_D | SEG_E | SEG_F,   // O
	SEG_C | SEG_E | SEG_G,                           // n
	SEG_A | SEG_D | SEG_E | SEG_F | SEG_G            // E
	};
TM1637Display display(CLK, DIO);
void setup()
{
}
void loop()
{
  int k;
  uint8_t data[] = { 0xff, 0xff, 0xff, 0xff };
  uint8_t blank[] = { 0x00, 0x00, 0x00, 0x00 };
  display.setBrightness(0x0f);
  // All segments on
  display.setSegments(data);
  delay(TEST_DELAY);
  // Selectively set different digits
  data[0] = display.encodeDigit(0);
  data[1] = display.encodeDigit(1);
  data[2] = display.encodeDigit(2);
  data[3] = display.encodeDigit(3);
  display.setSegments(data);
  delay(TEST_DELAY);
  /*
  for(k = 3; k >= 0; k--) {
	display.setSegments(data, 1, k);
	delay(TEST_DELAY);
	}
  */
  display.clear();
  display.setSegments(data+2, 2, 2);
  delay(TEST_DELAY);
  display.clear();
  display.setSegments(data+2, 2, 1);
  delay(TEST_DELAY);
  display.clear();
  display.setSegments(data+1, 3, 1);
  delay(TEST_DELAY);
  // Show decimal numbers with/without leading zeros
  display.showNumberDec(0, false); // Expect: ___0
  delay(TEST_DELAY);
  display.showNumberDec(0, true);  // Expect: 0000
  delay(TEST_DELAY);
	display.showNumberDec(1, false); // Expect: ___1
	delay(TEST_DELAY);
  display.showNumberDec(1, true);  // Expect: 0001
  delay(TEST_DELAY);
  display.showNumberDec(301, false); // Expect: _301
  delay(TEST_DELAY);
  display.showNumberDec(301, true); // Expect: 0301
  delay(TEST_DELAY);
  display.clear();
  display.showNumberDec(14, false, 2, 1); // Expect: _14_
  delay(TEST_DELAY);
  display.clear();
  display.showNumberDec(4, true, 2, 2);  // Expect: 04__
  delay(TEST_DELAY);
  display.showNumberDec(-1, false);  // Expect: __-1
  delay(TEST_DELAY);
  display.showNumberDec(-12);        // Expect: _-12
  delay(TEST_DELAY);
  display.showNumberDec(-999);       // Expect: -999
  delay(TEST_DELAY);
  display.clear();
  display.showNumberDec(-5, false, 3, 0); // Expect: _-5_
  delay(TEST_DELAY);
  display.showNumberHexEx(0xf1af);        // Expect: f1Af
  delay(TEST_DELAY);
  display.showNumberHexEx(0x2c);          // Expect: __2C
  delay(TEST_DELAY);
  display.showNumberHexEx(0xd1, 0, true); // Expect: 00d1
  delay(TEST_DELAY);
  display.clear();
  display.showNumberHexEx(0xd1, 0, true, 2); // Expect: d1__
  delay(TEST_DELAY);
  
	// Run through all the dots
	for(k=0; k <= 4; k++) {
		display.showNumberDecEx(0, (0x80 >> k), true);
		delay(TEST_DELAY);
	}
  // Brightness Test
  for(k = 0; k < 4; k++)
	data[k] = 0xff;
  for(k = 0; k < 7; k++) {
    display.setBrightness(k);
    display.setSegments(data);
    delay(TEST_DELAY);
  }
  
  // On/Off test
  for(k = 0; k < 4; k++) {
    display.setBrightness(7, false);  // Turn off
    display.setSegments(data);
    delay(TEST_DELAY);
    display.setBrightness(7, true); // Turn on
    display.setSegments(data);
    delay(TEST_DELAY);  
  }
 
  // Done!
  display.setSegments(SEG_DONE);
  while(1);
}

One more example. Try it.

<div style="height: 250px; position:relative; margin-bottom: 50px;" class="wp-block-simple-code-block-ace"><pre class="wp-block-simple-code-block-ace" style="position:absolute;top:0;right:0;bottom:0;left:0" data-mode="python" data-theme="xcode" data-fontsize="14" data-lines="Infinity" data-showlines="true" data-copy="false">// Include the library:
#include &lt;TM1637Display.h>
// Define the connections pins:
#define CLK 2
#define DIO 3
// Create display object of type TM1637Display:
TM1637Display display = TM1637Display(CLK, DIO);
// Create array that turns all segments on:
const uint8_t data[] = {0xff, 0xff, 0xff, 0xff};
// Create array that turns all segments off:
const uint8_t blank[] = {0x00, 0x00, 0x00, 0x00};
// You can set the individual segments per digit to spell words or create other symbols:
const uint8_t done[] = {
  SEG_B | SEG_C | SEG_D | SEG_E | SEG_G,           // d
  SEG_A | SEG_B | SEG_C | SEG_D | SEG_E | SEG_F,   // O
  SEG_C | SEG_E | SEG_G,                           // n
  SEG_A | SEG_D | SEG_E | SEG_F | SEG_G            // E
};
// Create degree Celsius symbol:
const uint8_t celsius[] = {
  SEG_A | SEG_B | SEG_F | SEG_G,  // Circle
  SEG_A | SEG_D | SEG_E | SEG_F   // C
};
void setup() {
  // Clear the display:
  display.clear();
  delay(1000);
}
void loop() {
  // Set the brightness:
  display.setBrightness(7);
  // All segments on:
  display.setSegments(data);
  delay(1000);
  display.clear();
  delay(1000);
  // Show counter:
  int i;
  for (i = 0; i &lt; 101; i++) {
    display.showNumberDec(i);
    delay(50);
  }
  delay(1000);
  display.clear();
  delay(1000);
  // Print number in different locations, loops 2 times:
  int j;
  for (j = 0; j &lt; 2; j++) {
    for (i = 0; i &lt; 4; i++) {
      display.showNumberDec(i, false, 1, i);
      delay(500);
      display.clear();
    }
  }
  
  delay(1000);
  display.clear();
  delay(1000);
  // Set brightness (0-7):
  int k;
  for (k = 0; k &lt; 8; k++) {
    display.setBrightness(k);
    display.setSegments(data);
    delay(500);
  }
  delay(1000);
  display.clear();
  delay(1000);
  // Print 1234 with the center colon:
  display.showNumberDecEx(1234, 0b11100000, false, 4, 0);
  delay(1000);
  display.clear();
  delay(1000);
  int temperature = 24;
  display.showNumberDec(temperature, false, 2, 0);
  display.setSegments(celsius, 2, 2);
  delay(1000);
  display.clear();
  delay(1000);
  display.setSegments(done);
  while(1);
}
</pre></div>
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