In this guide we'll go through the steps to create an hourglass style timer with your Circuit Playground.
An hourglass is an ancient timing device used to measure a fixed amount of time. It contains two chambers separated by a thin neck that allows sand to pass from one chamber to the other very slowly. The overall size and amount of sand determines the amount of time. Once all the sand has emptied into one side, the hourglass is simply inverted to start counting time again.
Here, we'll use the NeoPixels on the Circuit Playground to represent the grains of sand in an hourglass, having them "disappear" one at a time by turning them off. We can even have the hourglass "reset" by turning the Circuit Playground over. We'll build this up one step at a time and walk through each one.
This project uses the sensors already included on the Circuit Playground. The only additional items needed are batteries for power and a holder for the batteries.
If you are new to the Circuit Playground, you may want to first read these overview guides.
This project will use the Arduino IDE. Make sure you have added the board support for the Circuit Playground as well as installed the Circuit Playground library. MUST DO BOTH. This is covered in the guides linked above.