AIM:  Automatic Room Lights using Arduino and PIR Sensor. Objective:   We will be able to: Understand the working of PIR Sensor Understand the interfacing of PIR with arduino and Relay Develop real time program to Automatically control Room Lights Requirement : PC with internet, Arduino board, breadboard, PIR Sensor, Relay, LED, Jumper Wires  Theory: PIR Sensor: A PIR sensor is an electronic sensor used in motion detectors such as automatically triggered lighting devices and protection systems that measure devices emitting infrared light in their field of view. Each body with a temperature above zero releases heat energy, which is in the form of radiation. PIR sensors detect infrared radiation that is reflected or released from the target instead of measuring or sensing heat. If the sensor detects an animal, insect, or a