If you want to build a device that is used to detect sense motion and almost always used to detect whether a human has moved in or out of the sensors range. Then this Sensor is needed for you. you can buy this sensor from bot3dprint.com at a reasonable price

The PIR Motion Sensor Detector Module HC SR501 allows you to sense motion. It is almost always used to detect the motion of a human body within the sensor’s range. It is often referred to using “PIR”, “Pyroelectric”, “Passive Infrared” and “IR Motion” sensors.

Circuit Diagram of PIR Sensor With Arduino:

 Features :

1. Infrared Sensor with Control Circuit Board
2. The Sensitivity and Holding Time are adjustable.
3. Blockade time: 2.5s (Default)
4. Sensitive Setting: Turn to Right, Distance Increases (About 7M); Turn to Left, Distance Reduce (About 3M)
5. Time Setting: Turn to Right, Time Increases (About 200S); Turn to Left, Time Reduce (About 5S).

Package Includes :