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No Touch Hand Washing Countdown Timer

A simple 20 second no touch countdown timer using and Arduino UNO, an HC-SR04 Ultrasonic sensor and a 7 segment display.

paul-mccabePaul McCabe
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  • Components 5
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  • paul-mccabePaul McCabe

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  • HandWashingTimer
  • UltraSonic Sensor Code
  • 7 Segment Display Code
completed project
hardware
Hand Washing timer COVID-19 corona Virus hands free timer

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COVID-19 Response Project List

A project list for all projects that have to do with the COVID-19 (Coronavirus) pandemic.

This project was created on 03/22/2020 and last updated 2 years ago.

Description

The CDC recommends we wash our hands for at least 20 seconds due to the current COVID-19 pandemic. This is a simple no touch 20 second count down timer that you can use while washing your hands. The 20 count down starts when you wave your hand near the ultrasonic sensor.

Details

Files

handWashingTimer.ino

Arduino Sketch

ino - 6.40 kB - 03/22/2020 at 00:49

Download

Components

  • 1 × 1 each -Arduino UNO
  • 1 × 1 each - 4 Digit 7 Segment Display SMA420564
  • 1 × 1 each - UltraSonic Sensor HC-SR04
  • 1 × 4 each - 220 Ohm resistor
  • 1 × USB Battery

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