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Arduino Stopwatch Project

by Nikodem Bartnik

Here is a project that will help you build your own Arduino stopwatch using the Arduino Board and a few other components. After working on this basic Arduino countdown timer, a user suggested adding few more functionality to it, which is why we are coming back with this other timer with a short list of additions: You can set the time without having to change the code and it actually let you know when it reaches zero.

Arduino stopwatch

Here is what we need:

Arduino Stopwatch Project
  • 1 x Arduino Uno board
  • 1 x LCD with I2C converter
  • 1 x Buzzer
  • 1 x Potentiometer
  • Jumper wires
  • 1 x Breadboard

Here is schematic:

Arduino Stopwatch Project
Arduino Stopwatch Project
Arduino Stopwatch Project
Arduino Stopwatch Project

When you are done with the connections, you can upload the following program into the board.

This is what the user can do: Set the time between 1 and 120 minutes. After specifying the time, it waits for 5 seconds and starts counting down. When the time is up, it beeps a few times. As simple as that.

Here is a sample of my Arduino stopwatch at work.

Hope it helped. Catch you on the next project.

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