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Published February 22, 2018 © GPL3+

Stopwatch with ATtiny13 and TM1637 LED Module

A simple stopwatch.

IntermediateFull instructions provided1.5 hours7,930

Stopwatch with ATtiny13 and TM1637 LED Module

Things used in this project

Hardware components

Attiny13

TM1637 LED module

Push Button

Wire

Software apps and online services

Arduino IDE

Story

Circuit

If you have 5v power source you do not need to build the LM7805 Voltage regulator circuit as in the drawing.

7-segment display module based on TM1637 chip

ATtiny 13 pinout

Circuit

Code

Download TM1637 Library: https://github.com/lpodkalicki/attiny-tm1637-library/ and put files in same folder with code.

Arduino code:

That how long is 1 second may need manual calibration. For now it is 90m/s.

_delay_ms(90); //

/*
* ATtiny timer with TM1637 display
* Tauno Erik
* 18.02.2018
* 
*/
#include <stdint.h>
#include <avr/io.h>
#include <util/delay.h>
#include "tm1637.c" 
int main(void)
{
 uint8_t    i = 0; // Display 1 num right to left
 uint8_t   ii = 0; // Display 2 num right to left
 uint8_t  iii = 0; // Display 3 num right to left
 uint8_t iiii = 0; // Display 4 num right to left
 PORTB |= (1 << PB4); // enable start/stop button
 TM1637_init(); 
 while (1)
 {
 int BUTTON = PINB;
 if(!(BUTTON&0b00010000)){
   /*When Button is ON */
   // Display 1 num right to left
   TM1637_display_digit(TM1637_SET_ADR_03H,i % 0b00001010);
   // Display 2 num right to left
   if(i > 9 && ii==0){
     ii = i-9;
     TM1637_display_digit(TM1637_SET_ADR_02H, ii % 0b00001010);
     i = 0;
   }else if(i > 9 && ii > 0){
     ii++;
     TM1637_display_digit(TM1637_SET_ADR_02H, ii % 0b00001010);
     i = 0;
   }
   // Display 3 num right to left
   if(ii > 9 && iii==0){
     iii = ii-9;
     TM1637_display_digit(TM1637_SET_ADR_01H, iii % 0b00001010);
     ii = 0;
   }else if(ii > 9 && iii > 0){
     iii++;
     TM1637_display_digit(TM1637_SET_ADR_01H, iii % 0b00001010);
     ii = 0;
   }
   // Display 1 num right to left
   if(iii > 9 && iiii==0){
     iiii = iii-9;
     TM1637_display_digit(TM1637_SET_ADR_00H, iiii % 0b00001010);
     ii = 0;
   }else if(iii > 9 && iiii > 0){    
     TM1637_display_digit(TM1637_SET_ADR_00H, iiii % 0b00001010);
     iiii++;
     iii = 0;
   }
   _delay_ms(90);//
   i++;
 }else{
 /*When Button is OFF */ 
 }
 }//while loop end
}//main end

Tutorial how to setup Arduino and upload code: https://www.hackster.io/taunoerik/programming-attiny13-with-arduino-uno-07beba

Demo

Example

/*
 * ATtiny timer with TM1637 display
 * Tauno Erik
 * 18.02.2018
 * 
 */
 
#include <stdint.h>
#include <avr/io.h>
#include <util/delay.h>
#include "tm1637.c" 


int main(void)
{
  
  uint8_t    i = 0; // Display 1 num right to left
  uint8_t   ii = 0; // Display 2 num right to left
  uint8_t  iii = 0; // Display 3 num right to left
  uint8_t iiii = 0; // Display 4 num right to left

  PORTB |= (1 << PB4); // enable start/stop button

  TM1637_init(); 

  while (1)
  {
    
  int BUTTON = PINB;
  
  if(!(BUTTON&0b00010000)){
    /*When Button is ON */
      
    // Display 1 num right to left
    TM1637_display_digit(TM1637_SET_ADR_03H,i % 0b00001010);
      
    // Display 2 num right to left
    if(i > 9 && ii==0){
      ii = i-9;
      TM1637_display_digit(TM1637_SET_ADR_02H, ii % 0b00001010);
      i = 0;
    }else if(i > 9 && ii > 0){
      ii++;
      TM1637_display_digit(TM1637_SET_ADR_02H, ii % 0b00001010);
      i = 0;
    }
      
    // Display 3 num right to left
    if(ii > 9 && iii==0){
      iii = ii-9;
      TM1637_display_digit(TM1637_SET_ADR_01H, iii % 0b00001010);
      ii = 0;
    }else if(ii > 9 && iii > 0){
      iii++;
      TM1637_display_digit(TM1637_SET_ADR_01H, iii % 0b00001010);
      ii = 0;
    }
      
    // Display 1 num right to left
    if(iii > 9 && iiii==0){
      iiii = iii-9;
      TM1637_display_digit(TM1637_SET_ADR_00H, iiii % 0b00001010);
      ii = 0;
    }else if(iii > 9 && iiii > 0){    
      TM1637_display_digit(TM1637_SET_ADR_00H, iiii % 0b00001010);
      iiii++;
      iii = 0;
    }

    _delay_ms(90);//
    i++;
    
  }else{
  /*When Button is OFF */ 
  }
    
  
  }//while loop end
}//main end

/**
 * Copyright (c) 2017, ukasz Marcin Podkalicki <lpodkalicki@gmail.com>
 * 
 * This is ATtiny13/25/45/85 library for 4-Digit LED Display based on TM1637 chip.
 *
 * Features:
 * - display digits
 * - display colon
 * - display raw segments
 * - display on/off
 * - brightness control 
 *
 * References:
 * - library: https://github.com/lpodkalicki/attiny-tm1637-library
 * - documentation: https://github.com/lpodkalicki/attiny-tm1637-library/README.md
 * - TM1637 datasheet: https://github.com/lpodkalicki/attiny-tm1637-library/blob/master/docs/TM1637_V2.4_EN.pdf
 */

#ifndef	_ATTINY_TM1637_H_
#define	_ATTINY_TM1637_H_

#include <stdint.h>
#include <stdbool.h>

// Main Settings
#define	TM1637_DIO_PIN			PB0
#define	TM1637_CLK_PIN			PB1
#define	TM1637_DELAY_US			(50)
#define	TM1637_DEFAULT_BRIGHTNESS	(7)

// TM1637 commands
#define	TM1637_CMD_SET_DATA		0x40
#define	TM1637_CMD_SET_ADDR		0xC0
#define	TM1637_CMD_SET_DSIPLAY		0x80

// TM1637 data settings (use bitwise OR to contruct complete command)
#define	TM1637_SET_DATA_WRITE		0x00 // write data to the display register
#define	TM1637_SET_DATA_READ		0x02 // read the key scan data
#define	TM1637_SET_DATA_A_ADDR		0x00 // automatic address increment
#define	TM1637_SET_DATA_F_ADDR		0x04 // fixed address
#define	TM1637_SET_DATA_M_NORM		0x00 // normal mode
#define	TM1637_SET_DATA_M_TEST		0x10 // test mode

// TM1637 address settings (use bitwise OR to contruct complete command)
#define	TM1637_SET_ADR_00H		0x00 // address 00
#define	TM1637_SET_ADR_01H		0x01 // address 01
#define	TM1637_SET_ADR_02H		0x02 // address 02
#define	TM1637_SET_ADR_03H		0x03 // address 03

// TM1637 display control command set (use bitwise OR to consruct complete command)
#define	TM1637_SET_DISPLAY_OFF		0x00 // off
#define	TM1637_SET_DISPLAY_ON		0x08 // on


/**
 * Initialize TM1637 display driver.
 * Clock pin (TM1637_CLK_PIN) and data pin (TM1637_DIO_PIN) 
 * are defined at the top of this file.
 */
void TM1637_init(void);

/**
 * Display digits ('0'..'9') at positions (0x00..0x03)
 */
void TM1637_display_digit(const uint8_t addr, const uint8_t digit);

/**
 * Display raw segments at positions (0x00..0x03)
 * 
 *      bits:                 hex:
 *        -- 0 --               -- 01 --
 *       |       |             |        |
 *       5       1            20        02
 *       |       |             |        |
 *        -- 6 --               -- 40 --
 *       |       |             |        |
 *       4       2            10        04
 *       |       |             |        |
 *        -- 3 --               -- 08 --
 *
 * Example segment configurations:
 * - for character 'H', segments=0b01110110
 * - for character '-', segments=0b01000000
 * - etc.
 */
void TM1637_display_segments(const uint8_t addr, const uint8_t segments);

/**
 * Display colon on/off.
 */
void TM1637_display_colon(bool value);

/**
 * Clear all display segments (including colon).
 */
void TM1637_clear(void);

/**
 * Set display brightness.
 * Min brightness: 0
 * Max brightness: 7
 */
void TM1637_set_brightness(const uint8_t brightness);

/**
 * Turn display on/off.
 */
void TM1637_enable(const bool value);

#endif	/* !_ATTINY_TM1637_H_ */

/**
 * Copyright (c) 2017, ukasz Marcin Podkalicki <lpodkalicki@gmail.com>
 * 
 * This is ATtiny13/25/45/85 library for 4-Digit LED Display based on TM1637 chip.
 *
 * Features:
 * - display digits
 * - display colon
 * - display raw segments
 * - display on/off
 * - brightness control
 *
 * References:
 * - library: https://github.com/lpodkalicki/attiny-tm1637-library
 * - documentation: https://github.com/lpodkalicki/attiny-tm1637-library/README.md
 * - TM1637 datasheet: https://github.com/lpodkalicki/attiny-tm1637-library/blob/master/docs/TM1637_V2.4_EN.pdf
 */

#include <avr/io.h>
#include <util/delay.h>
#include "tm1637.h"

#define	TM1637_DIO_HIGH()		(PORTB |= _BV(TM1637_DIO_PIN))
#define	TM1637_DIO_LOW()		(PORTB &= ~_BV(TM1637_DIO_PIN))
#define	TM1637_DIO_OUTPUT()		(DDRB |= _BV(TM1637_DIO_PIN))
#define	TM1637_DIO_INPUT()		(DDRB &= ~_BV(TM1637_DIO_PIN))
#define	TM1637_DIO_READ() 		(((PINB & _BV(TM1637_DIO_PIN)) > 0) ? 1 : 0)
#define	TM1637_CLK_HIGH()		(PORTB |= _BV(TM1637_CLK_PIN))
#define	TM1637_CLK_LOW()		(PORTB &= ~_BV(TM1637_CLK_PIN))

#define	TM1637_FLAG_ENABLED		(1 << 0)
#define	TM1637_FLAG_SHOWCOLON		(1 << 1)


static void TM1637_configure(void);
static void TM1637_cmd(uint8_t value);
static void TM1637_start(void);
static void TM1637_stop(void);
static uint8_t TM1637_write_byte(uint8_t value);

static const uint8_t _digit2segments[] =
{
	0x3F, // 0
	0x06, // 1
	0x5B, // 2
	0x4F, // 3
	0x66, // 4
	0x6D, // 5
	0x7D, // 6
	0x07, // 7
	0x7F, // 8
	0x6F  // 9
};

static uint8_t _brightness = TM1637_DEFAULT_BRIGHTNESS;
static uint8_t _digit = 0xff;
static uint8_t _flags = 0x00;

void
TM1637_init(void)
{

	DDRB |= (_BV(TM1637_DIO_PIN)|_BV(TM1637_CLK_PIN));
	PORTB &= ~(_BV(TM1637_DIO_PIN)|_BV(TM1637_CLK_PIN));
	_flags |= TM1637_FLAG_ENABLED;
	TM1637_clear();
}

void
TM1637_display_digit(const uint8_t addr, const uint8_t digit)
{
	uint8_t segments = digit < 10 ? _digit2segments[digit] : 0x00;

	if (addr == TM1637_SET_ADR_01H) {
		_digit = digit;
		if (_flags & TM1637_FLAG_SHOWCOLON) {
			segments |= 0x80;
		}
	}

	TM1637_display_segments(addr, segments);
}

void
TM1637_display_segments(const uint8_t addr, const uint8_t segments)
{

	TM1637_cmd(TM1637_CMD_SET_DATA | TM1637_SET_DATA_F_ADDR);
	TM1637_start();
	TM1637_write_byte(TM1637_CMD_SET_ADDR | addr);
	TM1637_write_byte(segments);
	TM1637_stop();	
	TM1637_configure();	
}

void
TM1637_display_colon(bool value)
{

	if (value) {
		_flags |= TM1637_FLAG_SHOWCOLON;
	} else {
		_flags &= ~TM1637_FLAG_SHOWCOLON;
	}
	TM1637_display_digit(TM1637_SET_ADR_01H, _digit);
}

void
TM1637_clear(void)
{	

	TM1637_display_colon(false);
	TM1637_display_segments(TM1637_SET_ADR_00H, 0x00);
	TM1637_display_segments(TM1637_SET_ADR_01H, 0x00);
	TM1637_display_segments(TM1637_SET_ADR_02H, 0x00);
	TM1637_display_segments(TM1637_SET_ADR_03H, 0x00);
}

void
TM1637_set_brightness(const uint8_t brightness)
{

	_brightness = brightness & 0x07;
	TM1637_configure();
}

void
TM1637_enable(bool value)
{

	if (value) {
		_flags |= TM1637_FLAG_ENABLED;
	} else {
		_flags &= ~TM1637_FLAG_ENABLED;
	}
	TM1637_configure();
}

void
TM1637_configure(void)
{
	uint8_t cmd;

	cmd = TM1637_CMD_SET_DSIPLAY;
	cmd |= _brightness;
	if (_flags & TM1637_FLAG_ENABLED) {
		cmd |= TM1637_SET_DISPLAY_ON;
	}

	TM1637_cmd(cmd);
}

void
TM1637_cmd(uint8_t value)
{

	TM1637_start();
	TM1637_write_byte(value);
	TM1637_stop();
}

void
TM1637_start(void)
{

	TM1637_DIO_HIGH();
	TM1637_CLK_HIGH();
	_delay_us(TM1637_DELAY_US);
	TM1637_DIO_LOW();
}

void
TM1637_stop(void)
{

	TM1637_CLK_LOW();
	_delay_us(TM1637_DELAY_US);

	TM1637_DIO_LOW();
	_delay_us(TM1637_DELAY_US);

	TM1637_CLK_HIGH();
	_delay_us(TM1637_DELAY_US);

	TM1637_DIO_HIGH();
}

uint8_t
TM1637_write_byte(uint8_t value)
{
	uint8_t i, ack;

	for (i = 0; i < 8; ++i, value >>= 1) {
		TM1637_CLK_LOW();
		_delay_us(TM1637_DELAY_US);

		if (value & 0x01) {
			TM1637_DIO_HIGH();
		} else {
			TM1637_DIO_LOW();
		}

		TM1637_CLK_HIGH();
		_delay_us(TM1637_DELAY_US);
	}

	TM1637_CLK_LOW();
	TM1637_DIO_INPUT();
	TM1637_DIO_HIGH();
	_delay_us(TM1637_DELAY_US);

	ack = TM1637_DIO_READ();
	if (ack) {
		TM1637_DIO_OUTPUT();
		TM1637_DIO_LOW();
	}
	_delay_us(TM1637_DELAY_US);

	TM1637_CLK_HIGH();
	_delay_us(TM1637_DELAY_US);

	TM1637_CLK_LOW();
	_delay_us(TM1637_DELAY_US);

	TM1637_DIO_OUTPUT();

	return ack;
}

Credits

Tauno Erik

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Stopwatch with ATtiny13 and TM1637 LED Module

Things used in this project

Hardware components

Software apps and online services

Story

Circuit

Code

Demo

Code

TM1637_Timer.ino

tm1637.h

tm1637.c

Credits

Tauno Erik

Comments

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Stopwatch with ATtiny13 and TM1637 LED Module

Stopwatch with ATtiny13 and TM1637 LED Module

Things used in this project

Hardware components

Software apps and online services

Story

Circuit

Code

Demo

Code

TM1637_Timer.ino

tm1637.h

tm1637.c

Credits

Tauno Erik

Comments

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