In my previous article I looked at the options of using a PIR sensor in Arduino projects and I came to the conclusion that the best option is to use a commercially available module.
However, when the requirement is to detect movement really close to the sensor, we can use a bare PIR element to detect the movement up-close.
As a proof of concept for this, I've created this hand washing timer prototype circuit with a NeoPixel LED ring that lights up in a rainbow pattern whenever we wave in front of the PIR element.
For more details on the project, make sure to also check the Instructable for it.
To learn more about PIR sensors, please check my previous video.
Tools and materials needed for the project: