Automatic Energy Saving System using Micro controller - IR Sensors , Relays combination

Automatic room light control using IR Sensors, AT89C51 controller , 16*2 LCD, 5V DC Relays. Persons counting system used by IR sensors connected with IO pins. It generates High to Low pulse. Entry count displayed on 16*2 LCD with 1st line, Exit count detected by another IR sensor displayed on 2nd line and total count displayed with second line middle position. Electrical loads connected with Relays. if more than 3 persons inside two loads ON.