A PIR (Passive Infrared) sensor is an electronic sensor that measures infrared light radiating from objects in its field of view. It can be used as a PIR based motion detector. All objects with a temperature above absolute zero emit heat energy in the form of radiation. This radiation isn't visible to human eyes because it radiates at IR wavelengths. The passive IR sensor do not generate or radiate any energy for detection purposes, instead it works entirely by detecting the energy given off by other objects.
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| Working formula of PIR |
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| PIR sensor |
Making a Motion Detector using PIR
To make a motion detector using PIR we are going to need the following instruments-
1. 9V battery
2. PIR sensor
3. Breadboard
4. Jumper wires both male to male and male to female
5. LED
6. 7805 IC
[ N.B:If 5V is given to the PIR input then 7805 IC is not required. Because 7805 IC is used to convert the 9V battery input into 5V.]
The 7805 IC is the first to put in the breadboard. Then jumper wires are used to short the ground. The shorted ground is used for PIR ground and LED ground. The output of the IC is to be connected with the vcc of PIR sensor. Now the PIR out is connected with the LED positive. Then the battery is to be inserted to the circuit and the battery positive is to be connected to the 7805 IC in and the battery negative to the IC ground. That's all, now, if motion is occurred by any object emitting IR within the range of PIR sensor the light will glow up and it will work as a motion detector.
Here is a video that will help to make a motion detector using PIR sensor-
"How to Make a Motion Detector using PIR Sensor"
Here are some pictures how the circuit is made and connection are done and the LED is glowing due to motion. Watch the video for detailed working process of how to make this motion sensor.
Thank you.
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| Circuit diagram |
Here is a video that will help to make a motion detector using PIR sensor-
"How to Make a Motion Detector using PIR Sensor"
 |
| Circuit on breadboard |
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| PIR sensor sensing motion and LED glowing |
Here are some pictures how the circuit is made and connection are done and the LED is glowing due to motion. Watch the video for detailed working process of how to make this motion sensor.
Thank you.
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