The circuit schematic and breadboard. ... Solder 2 long wires to the LDR and put it to the light. When someone is turning on the light the Piezo will start immediately to beep. Advertisement. 1 ...

The amount of light reaching the LDR from the LED decreases as the pipe is bent, and with a simple divider circuit a voltage can be read by an Arduino. ... but using another LED as the light sensor.

The analog output (OUT) of the circuit can be connected to any analog input of the Arduino, for example A1. Although it is very simple to fabricate the add-on hardware using TEMT6000 on a very small ...