This guide will show two ways to build a hand washing timer. Bored of singing "Happy Birthday"? This countdown timer will help you scrub your hands with soap for a full 20 seconds with confidence, as outlined by the US Centers For Disease Control and Prevention handwashing guidelines.

Plus, there's no need to touch the timer, in order keep it clean.

Two different version of the project here -- one in MakeCode for Circuit Playground Express, the other in CircuitPython for the CLUE. Use a loud sound, such as a clap or snap to activate the CPX timer, or a wave of a hand to start the CLUE.

This is a great beginner project to show how to make a real product with a few 'blocks' of code!

Parts

A Black woman's manicured hand holds a round microcontroller with lit up LEDs.
Circuit Playground Express is the next step towards a perfect introduction to electronics and programming. We've taken the original Circuit Playground Classic and...
$24.95
In Stock
Top down view of a clear acrylic Adafruit Circuit Playground Express or Bluefruit Enclosure.
We've got nice cases for many of our beloved boards, but the Circuit Playground Express and
Out of Stock
Animated GIF showing CLUE board  displaying data from the many on-board sensors.
Do you feel like you just don't have a CLUE? Well, we can help with that - get a CLUE here at Adafruit by picking up this sensor-packed development board. We wanted to build some...
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USB cable - USB A to Micro-B - 3 foot long
This here is your standard A to micro-B USB cable, for USB 1.1 or 2.0. Perfect for connecting a PC to your Metro, Feather, Raspberry Pi or other dev-board or...
$2.95
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This guide was first published on Apr 01, 2020. It was last updated on Mar 19, 2024.

This page (Overview) was last updated on Mar 08, 2024.

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