How to make Digital Stopwatch using Arduino and push buttons

 

What is a Digital Stopwatch?

A digital stopwatch can be a circuit displaying the actual time in minutes, hours and seconds or a circuit displaying the number of clock pulses.

A stopwatch is used to measure the time interval of an event. It is a kind of watch that stands out for the accuracy and precision with which it can measure the time of an event. It works by pressing a start button and then stopping it. It is also known as a chronometer and is used to measure fractions of time, usually short and accurately. Basically there are two types of stopwatch, Digital stopwatch, and Analog stopwatch.

 

How a stopwatch works

The operation of a stopwatch is to accurately count the time of an event. The timers are easy to use, to start the count you must press a start button. Once the event is over, time stops on the stop button.

The time covered by the recorded event will be displayed on the face of the wristwatch, as well as other common data, such as time and date. You can restart the stopwatch to count another event or event. There are wristwatches that have a chronometer, but there are also models that can be hung on the neck or carried in the pocket.

You all have a Stopwatch at your home.

Have you ever wondered to make a Stopwatch at home using some Electronics components?

If yes, You are in the right blog page.

In this Blog I'll tell you How you can make a Digital Stopwatch using Arduino at home..
Just read the whole blog.

 

 

 

Follow the steps to make this Digital Stopwatch at home.

Or else you can watch the video from below.

This Stopwatch uses 3 push buttons to Start, Stop and Reset the timer.

Timer is shown on the 16 x 2 LCD display. The programming has to be uploaded in the Arduino Uno.

 

 

 

 

 

If you want to buy components, here is my Amazon India Affiliate links.

Parts List :

1. Arduino Uno : https://amzn.to/3JH9OJi

 

2. LCD Display : https://amzn.to/3MESuas

 

3. Jumper Wires : https://amzn.to/34smHIo

 

4. Breadboard : https://amzn.to/3vUFRC6

 

5. LEDs : https://amzn.to/3uAzaUT

Steps to be followed to make this Stopwatch

1. Take Breadboard and place LCD display on it.

 

2. Connect 10k pot on breadboard.

 

3. Connect 3 push buttons on the breadboard.

 

4. Connect red and green led on breadboard.

 

5. Connect Buzzer.

 

6. Do connections from Circuit diagram.

 

7. Upload Arduino code.

That's all..

Your Stopwatch is completed.

Circuit Diagram

 

 

 

 Just Copy the Arduino code and paste it in Arduino IDE.

 

#include <LiquidCrystal.h> //Libraries

LiquidCrystal lcd(2, 3, 4, 5, 6, 7); //Arduino pins to lcd

#define bt_start  A0

#define bt_stop   A1

#define bt_reset  A2

#define G_led 8 

#define R_led 9 

#define buzzer 13

int hh=0, mm=0, ss=0, ms=0; 

bool timerStart = false;

void setup() { // put your setup code here, to run once 

pinMode(bt_start, INPUT_PULLUP);

pinMode(bt_stop,  INPUT_PULLUP);

pinMode(bt_reset, INPUT_PULLUP);

pinMode(R_led,OUTPUT); // declare Red LED as output

pinMode(G_led,OUTPUT); // declare Green LED as output

pinMode(buzzer,OUTPUT); // declare Buzzer as output 

lcd.begin(16, 2); // Configura lcd numero columnas y filas

lcd.clear();

lcd.setCursor (0,0);

lcd.print("  Welcome  To  ");

lcd.setCursor (0,1);

lcd.print("   Stopwatch   ");

delay(2000);

lcd.clear();

 

 noInterrupts();         // disable all interrupts

 TCCR1A = 0;             // set entire TCCR1A register to 0  //set timer1 interrupt at 1kHz  // 1 ms

 TCCR1B = 0;             // same for TCCR1B

 TCNT1  = 0;             // set timer count for 1khz increments

 OCR1A = 1999;           // = (16*10^6) / (1000*8) - 1

 //had to use 16 bit timer1 for this bc 1999>255, but could switch to timers 0 or 2 with larger prescaler

 // turn on CTC mode

 TCCR1B |= (1 << WGM12); // Set CS11 bit for 8 prescaler

 TCCR1B |= (1 << CS11);  // enable timer compare interrupt

 TIMSK1 |= (1 << OCIE1A);

 interrupts();           // enable

}

void loop() {

if(digitalRead (bt_start) == 0){ 

digitalWrite(buzzer, HIGH);   

timerStart = true; // Start stopwatch 

delay(100);

}

if(digitalRead (bt_stop) == 0){ 

digitalWrite(buzzer, HIGH);   

timerStart = false; // Stop stopwatch 

delay(100);

}

if(digitalRead (bt_reset) == 0){ 

digitalWrite(buzzer, HIGH);   

ms=0, ss=0, mm=0, hh=0; // Reset stopwatch 

delay(100);

}

lcd.setCursor (0,0);

lcd.print("   Stopwatch   ");

lcd.setCursor (2,1);

lcd.print((hh/10)%10);

lcd.print(hh%10);

lcd.print(":");

lcd.print((mm/10)%10);

lcd.print(mm%10);

lcd.print(":");

lcd.print((ss/10)%10);

lcd.print(ss%10);

lcd.print(":");

lcd.print((ms/100)%10);

lcd.print((ms/10)%10);

lcd.print(ms%10);

if(timerStart==true){

digitalWrite(G_led, HIGH); // Turn LED on.  

digitalWrite(R_led, LOW);  // Turn LED off.

}else{

digitalWrite(G_led, LOW); // Turn LED off.   

digitalWrite(R_led, HIGH);  // Turn LED on. 

}

  

digitalWrite(buzzer, LOW);

}

ISR(TIMER1_COMPA_vect){   

if(timerStart == true){ms=ms+1;

if(ms>999){ms=0;ss=ss+1;

if(ss>59){ss=0; mm=mm+1;}

if(mm>59){mm=0; hh=hh+1;}

  }  

 }

}

 

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