The World Well being Group (WHO) recommends that everybody ought to rub their fingers with cleaning soap for a minimum of 20 seconds earlier than washing with water to stop transmission of the novel Corona virus, which is once more on rise, along with social distancing. The 20-second interval will be checked with wristwatches and the stopwatches on cellphones, however these will not be handy to make use of whereas washing fingers. This proposed circuit rings a buzzer for 20 seconds and switches on an LED for audio in addition to visible indication (for these with listening to points).
The writer’s prototype is proven in Fig. 1.
![Remote Controlled Corona Protection Bell Fig. 1: Author’s prototype on a breadboard](/wp-content/uploads/2023/02/Remote-Controlled-Corona-Protection-Bell.jpg)
Obtain PCB and Element Format PDFs: click on right here
This venture will probably be printed in a number of weeks. If you wish to entry it now, consult with Electronics For You’s January 2023 Situation–print or ezine version.