Our schematic consists on 3 elements which are: Photoresistor (LDR), Piezo Buzzer, 1 – 10 kΩ. The LDR can be connected any way you want because doesn’t have polarity. For resistance you can use from 1 ...

Below is the schematic — nothing but a very simple microcontroller-based circuit with just a handful of electronic components. As shown ... (LDR) mounted to the top side with epoxy ... /* -Unique Fox ...