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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:

  • 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:

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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