Credits DonutStudioTimer.h - Arduino library for creating a timer with the millis ()-function. Created by Donut Studio, January 30, 2024. Released into the public domain.

Before we dive into the intricacies of how our Arduino Pomodoro Timer functions, let's take a quick look at the components you'll need: Ardui no Nano: The brain of our timer, handling the programming.

Also, this module focuses on how to time events using Arduino’s built-in function millis (). It is designed to be used with a pre-built ramp that can be provided if used in a classroom environment.

Droplet and StackAR, developed by MIT’s Media Lab, allow users to set timers or program an Arduino using light-based communication. By pressing the tool against a screen, flashes of light can ...

[Scott-28] recently sent in a particularly well-documented project that turned an antique rotary phone into a digital kitchen timer using an internal Arduino.

You could put the Arduino in deep sleep, if you wanted to and that LED will still blink. With a little work, you could probably adapt this idea to any number of circuits out of the 555 playbook ...