Hello friends! Today, we will install the PIR Sensor Library for Proteus and build a motion-detection demonstration with Arduino. We will first understand the sensor's output, then install the library, connect the circuit and write a program that reports when a motion event starts and ends. The original PIR model uses a TestPin to represent motion in the simulation. That input lets us exercise the receiving circuit without trying to reproduce a person walking through an infrared detection pattern. It is a simulation control, not an extra connection found on a typical three-pin PIR module. We will also improve the timing explanation. A sensor output going LOW and an application declaring an area inactive are different events. Our Arduino example waits for five continuous seconds of LOW befo ...