On the software end, the Arduino code is pretty simple, with only less than 50 lines and basic functions used. ... (LDR). The LDR continuously monitors the intensity of light in the room.

First of all, remove the LDR used in the setup, and extend +5-V and A0 connections as depicted in the hardware layout shown below. Also, replace the 10K resistor with a 47K to 100K one ... Arduino ...