Introduction
Have you seen in some cool places, the lights get turns ON when you walk or just take a step at that place. These places use motion detection sensors. One of the most extensive and inexpensive sensors for this purpose is the PIR motion detection sensor. It’s a low-powered Passive infrared sensor generally used in security devices and for automatic lighting systems. It gives notification about the movement, but not the give information about who moved. It is sometimes also called Passive infrared detectors, which is abbreviated as PID. In this tutorial, we are going to “PIR Motion Detector Circuit”.
Hardware Required
| S.no | Component | Value | Qty |
|---|---|---|---|
| 1. | PIR Sensor | – | 1 |
| 2. | Relay | 5V | 1 |
| 3. | NPN Transistor | BC547 | 1 |
| 4. | Diode | 1N4007 | 1 |
| 5. | Resistor | 1KΩ | 1 |
| 6. | AC Bulb | – | 1 |
| 7. | Battery | 9V | 1 |
| 8. | 2-Pin Connector | – | 2 |
Circuit Diagram
Working Explanation
In this PIR Motion Detector Circuit, we are using the PIR sensor having three terminals, Vcc, Gnd, and output. The sensor requires very few components to connect with. The sensor provides the output when detects any motion. When it detects any motion, it gives the signal to the transistor connected in a circuit, working as a switch. The collector terminal is connected with the relay. The other end of the Relay is connected to the positive supply. The electric bulb is connected with a normally open terminal of the relay. So, the Relay turns on then the common pin makes a connection with the normally open pin and then the bulb starts to glow.
Application and Uses
- In automation circuits.
- In security circuits
- Moreover, for security purpose
- further, in the home automation systems
- Alson intruder alarm circuits.
- Intand-alone alarm circuits, etc.
