UNIQUE FEATURES OF PIR MOTION SENSORS

1. UNIQUE FEATURES • OF • PIR MOTION SENSORS

2. introduction They use built-in amplifier to detect motion The IR module is specifically used to detect IR radiation (body heat) from the human body They can also detect other things that generate IR radiation

3. Internal components A built-in amplifier to convert IR radiation to voltage A comparator for converting output to digital form A stabilized power supply unit to supply power to the circuit A quad-type pyroelectric element to detect movement within its range

4. Detection of movement The quad-type pyroelectric element has 4 similar receptors The sensor can pick up even the smallest movements within the receptor’s range This makes PIR motion sensors more accurate and effective

5. Working principles IR motion sensors detect radiation instead of emitting them Then the comparator’s output increases and lights up the LED The inverting input becomes low when the sensor detects IR radiation 3 different resistors in the IC transfer current to all internal components

6. Types of ir sensors IR sensors are of different types depending on their usage Temperature sensors detect temperature Ultrasonic sensors can measure distance between two points PIR sensors are used for home/commercial security

7. Focusing mechanism in ir sensors PIR motion sensors use The main task of lenses/mirrors is to focus light onto the sensor Mirrors have slightly more range than lenses LENS MIRROR OR

8. HOW TO avoid false detections Avoid installing PIR motion detectors near HVAC vents that blow cold/hot air Install them high up on the wall to avoid being triggered by toddlers and pets Avoid placing them on the wall directly facing the window

9. Thank you