PIR-sensor

👁️ PIR Motion Sensor Module
📖 Product Description

The PIR (Passive Infrared) Sensor detects infrared radiation changes emitted by moving objects, typically humans or animals.

It is a passive sensor (doesn’t emit IR, only senses it) and outputs a digital HIGH/LOW signal when motion is detected.

Commonly used in:

Motion-activated lights

Home security alarms

Smart home automation

Robotics (object detection)

Energy-saving systems

The module is easy to interface with microcontrollers like Arduino, ESP32, STM32, and Raspberry Pi.

✨ Key Features

✅ Detects human/animal movement
✅ Passive infrared (no emission)
✅ Adjustable sensitivity
✅ Adjustable time delay for output
✅ Digital output (HIGH = motion detected)
✅ Low power consumption (~50 µA idle)
✅ Operating voltage: 5V DC (typical)
✅ Compact and lightweight

📊 Technical Specifications
Parameter Typical Value
Operating Voltage 3.3 – 5V DC
Output Type Digital (HIGH/LOW)
Detection Range 3 – 7 meters (typical)
Detection Angle 110° – 120°
Output Duration Adjustable: 0.5 – 5 seconds (some modules: 5 – 200s)
Trigger Motion detected → HIGH
Current ~50 µA idle / 10 mA active
Operating Temperature −15°C to +70°C
📍 Pin Configuration (Common 3-pin module)
Pin Function
VCC 3.3V – 5V power supply
GND Ground
OUT Digital signal output (HIGH = motion detected)

Some advanced modules include sensitivity and time adjustment potentiometers:

SENS → adjust detection distance

TIME → adjust output HIGH duration

🔌 Basic Wiring (Arduino Example)
PIR Pin Arduino Pin
VCC 5V
GND GND
OUT Digital pin (e.g., D2)
Example Code Snippet
int pirPin = 2;
int ledPin = 13;

void setup() {
pinMode(pirPin, INPUT);
pinMode(ledPin, OUTPUT);
Serial.begin(9600);
}

void loop() {
int motion = digitalRead(pirPin);
if (motion == HIGH) {
digitalWrite(ledPin, HIGH);
Serial.println("Motion detected!");
} else {
digitalWrite(ledPin, LOW);
}
}

🔧 Practical Notes

Warm-up time: ~30 seconds after power-on

Detection is PIR only: doesn’t detect stationary objects

Adjust angle and distance using module potentiometers

Avoid placing near heat sources (sunlight, heaters)

📦 Applications

Perfect for:

🏠 Home security
💡 Automatic lighting
🤖 Robotics motion sensing
🏢 Office energy-saving systems
🎯 Smart automation triggers

⭐ Quick Summary

👉 Type: Passive Infrared Motion Sensor
👉 Voltage: 3.3–5V DC
👉 Output: Digital HIGH on motion
👉 Range: 3–7 meters
👉 Angle: 110°
👉 Interface: Arduino / Microcontroller compatible