Lesson 20: Using TM1637 4 digit display

Please select other codes for this lecture from the links below.

• Lesson 20-1: Basic Usage
• Lesson 20-2: 4 digit counter

Related or required files and link to this lesson

• TM1637 Library

Part 2: LCD, LED and OLED Screens

In this lecture we learn how to use TM1637 four digit seven segment display to display integer and hexadecimal vlaues. Decimal point can't be dispalyed easily.

 /*
 *  Robojax Arduino Step By Step Course
 * Lesson 20-1  Introduction to TM1637 4 digits LED Display
 * 
 *  This code has been modefied from the Arduino library
 
 
   Please watch video instruction here https://youtu.be/cJqmXjERwkQ
 This code is available at http://robojax.com/course1/?vid=lecture11
 
with over 100 lectures Free On  YouTube Watch it here http://robojax.com/L/?id=338
Get the code for the course: http://robojax.com/L/?id=339 
 *  Updted by Ahmad Shamshiri for Robojax 
 *  in Ajax, Ontario, Canada
 *  
 *  
 *  This is code for LCD1602 Display with I2C module
 *  which can display text on the screen.
 */
#include <Arduino.h>
#include <TM1637Display.h>

// Module connection pins (Digital Pins)
#define CLK 5
#define DIO 6

// 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()
{
//Robojax Arduino Step By Step Course http://robojax.com/L/?id=338	
}

void loop()
{
	//Robojax Arduino Step By Step Course http://robojax.com/L/?id=338
  int k;
  uint8_t data[] = { 0xff, 0xff, 0xff, 0xff };
  display.setBrightness(0x0f);

  // All segments on
  display.setSegments(data);
  delay(TEST_DELAY);

  // Selectively set different digits
  data[0] = 0b01001001;
  data[1] = display.encodeDigit(1);
  data[2] = display.encodeDigit(2);
  data[3] = display.encodeDigit(3);

  for(k = 3; k >= 0; k--) {
	display.setSegments(data, 1, k);
	delay(TEST_DELAY);
	}

  display.setSegments(data+2, 2, 2);
  delay(TEST_DELAY);

  display.setSegments(data+2, 2, 1);
  delay(TEST_DELAY);

  display.setSegments(data+1, 3, 1);
  delay(TEST_DELAY);


  // Show decimal numbers with/without leading zeros
  bool lz = false;
  for (uint8_t z = 0; z < 2; z++) {
	for(k = 0; k < 10000; k += k*4 + 7) {
		display.showNumberDec(k, lz);
		delay(TEST_DELAY);
	}
	lz = true;
  }

  // Show decimal number whose length is smaller than 4
  for(k = 0; k < 4; k++)
	data[k] = 0;
  display.setSegments(data);

	// Run through all the dots
	for(k=0; k <= 4; k++) {
		display.showNumberDecEx(0, (0x80 >> k), true);
		delay(TEST_DELAY);
	}

  display.showNumberDec(153, false, 3, 1);
  delay(TEST_DELAY);
  display.showNumberDec(22, false, 2, 2);
  delay(TEST_DELAY);
  display.showNumberDec(0, true, 1, 3);
  delay(TEST_DELAY);
  display.showNumberDec(0, true, 1, 2);
  delay(TEST_DELAY);
  display.showNumberDec(0, true, 1, 1);
  delay(TEST_DELAY);
  display.showNumberDec(0, true, 1, 0);
  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);
  
  //Robojax Arduino Step By Step Course http://robojax.com/L/?id=338
}




   

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