The code for the project is self-explanatory and easy for beginners to understand, too. You'll be working with analog readings from the input (photoresistor) and an Arduino library for the output ...

* function: if you place the photoresistor in a dark environment, the buzzer will beep sharply; if you shine a flashlight on the photoresistor, the buzzer beeping will slow down.

With just a handful of basic components, this project is a great one for beginners to sink their teeth into. The tester is based around a photoresistor ... OLED screen. An Arduino naturally ...