Arduino Stopwatch

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About: If it moves and it isn't supposed to move, Duct Tape it. If it doesn't move and its supposed to move, WD40 it. Hack with Sugru. Conor is a participant in the Amazon Services LLC Associates Program, an affi...

Intro: Arduino Stopwatch

This Instructable will show you how to make a stop watch out of an Arduino.

Step 1: What You Will Need

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You Will Need:

- 1x Arduino Uno:

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- 1x LCD Keypad Shield:

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- 1x USB A - B Connector Cable:

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Step 2: Slot the LCD Display Onto the Arduino

This step is very simple just slot the LCD display onto the Arduino.

Step 3: Connect and Install the Program

Just connect your Arduino to The Computer and install the program.

Update - Please use the Modified Stopwatch Program.

Step 4: Run Your Stopwatch

Now just run your stopwatch.

5 People Made This Project!

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37 Discussions

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randim19

16 days ago on Introduction

I made it thank you, Would you allow me to make a video on YouTube of this working?

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AslamM3

1 year ago

thank you very much

WhatsApp Image 2017-05-20 at 11.10.05 PM.jpeg
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Elac.

3 years ago on Introduction

Very cool idea and a great starting point, thanks!!!

I did a bit of rewrite to make it more accurate and display the time as it progresses plus other tweaks :

/*

Standalone Arduino StopWatch

By Conor M - 11/05/15

Modified by Elac - 12/05/15

*/

// call the necessary libraries
#include <SPI.h>
#include <LiquidCrystal.h>
// these are the pins used on the shield for this sketch
LiquidCrystal lcd(8, 13, 9, 4, 5, 6, 7);
// variables used on more than 1 function need to be declared here
unsigned long start, finished, elapsed;
boolean r = false;
// Variables for button debounce time
long lastButtonPressTime = 0; // the last time the button was pressed
long debounceDelay = 50; // the debounce time; keep this as low as possible

void setup()
{
lcd.begin(16, 2); // inicialize the lcd (16 chars, 2 lines)

// a little introduction :)
lcd.setCursor(4, 0); // set the cursor to first character on line 1 - NOT needed (it sets automatically on lcd.begin()
lcd.print("Arduino");
lcd.setCursor(3, 1); // set the cursor to 4th character on line 2
lcd.print("StopWatch");
delay(2000); // wait 2 seconds
lcd.clear(); // clear the display
lcd.print("Press select for");
lcd.setCursor(2, 1); // set the cursor to 3rd character on line 2
lcd.print("Start & Stop");
}

void loop()
{
CheckStartStop();
DisplayResult();
}

void CheckStartStop()
{
int x = analogRead (0); // assign 'x' to the Arduino's AnalogueInputs (Shield's buttons)
if (x < 800 && x > 600 ) // if the button is SELECT
{
if ((millis() - lastButtonPressTime) > debounceDelay)
{

if (r == false)
{
lcd.clear();
lcd.setCursor(2, 0); // needed
lcd.print("Elapsed Time");
start = millis(); // saves start time to calculate the elapsed time
}
else if (r == true)
{
lcd.setCursor(2, 0); // needed
lcd.print(" Final Time ");
}
r = !r;
}
lastButtonPressTime = millis();
}
}

void DisplayResult()
{
if (r == true)
{
finished = millis(); // saves stop time to calculate the elapsed time
// declare variables
float h, m, s, ms;
unsigned long over;

// MATH time!!!
elapsed = finished - start;

h = int(elapsed / 3600000);
over = elapsed % 3600000;
m = int(over / 60000);
over = over % 60000;
s = int(over / 1000);
ms = over % 1000;
// display the results
lcd.setCursor(0, 1);
lcd.print(h, 0); // display variable 'h' - the 0 after it is the number of algorithms after a comma (ex: lcd.print(h, 2); would print 0,00
lcd.print("h "); // and the letter 'h' after it
lcd.print(m, 0);
lcd.print("m ");
lcd.print(s, 0);
lcd.print("s ");
if (h < 10)
{
lcd.print(ms, 0);
lcd.print("ms ");
}
}
}

1 reply
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wobblybob808Elac.

Reply 1 year ago

Elac,

I only want to count time while the button or another input is present , how would I go about this?

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heavypetal

1 year ago

I'm struggling to get external buttons to work - I want to add a start and stop but keep getting stuck! Anybody done this with the modified code? :)

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bennyleo

1 year ago

Welcome to join the group :)

https://www.facebook.com/groups/305526369783769/

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jagdeep010

2 years ago

how to install the program I don't see anything on my computer after connecting the arduino to it. do we need some software like matlab or something?

1 reply
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Conor Mjagdeep010

Reply 2 years ago

Make sure you have downloaded the arduino software from https://www.arduino.cc/en/Main/Software

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amans149

2 years ago

I want a coding I want to connect ir sensor to micro servo so that if something pass from front of ir sensor servo rotates at a 90 degree angle and returns to its initial position. I have a ARDUINO UNO for the purpose.... Can anybody do coding for this..PLZ PLZ PLZ THANK YOU... HOPE U REPLY...

please reply here --http://arduino.stackexchange.com/questions/28666/coding-for-connect-servo-with-ir-sensor-to-ardiuino

2 replies
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Conor Mamans149

Reply 2 years ago

The code is there for you to use

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Conor Mamans149

Reply 2 years ago

Check out one of my other instructables, how to make an arduino web server, it uses a servo, hope it helps

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R Jordan Kreindler

2 years ago

Outstanding. I am using it and am happy to say it works without problem.

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musi mumu

2 years ago

can somebody give me a version for measuring and displaying seconds,miliseconds and microseconds all on 3 digits each . If yes thanks in advance and contact me at mmedocean@gmail.com

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Avangura

2 years ago

on the line elapsed = finished - start I am getting an error 'start' was not declared in this scope.

Any ideas?

1 reply