Arduino program to interface a PIR (Passive Infrared) sensor

Arduino to interface a PIR (Passive Infrared) sensor . A PIR sensor detects motion by measuring changes in infrared levels emitted by surrounding objects.

Components Needed:

Arduino board (e.g., Uno)
PIR sensor module
Breadboard and jumper wires

Circuit Connection:

Connect the VCC pin of the PIR sensor to the 5V pin of the Arduino.
Connect the GND pin of the PIR sensor to the GND pin of the Arduino.
Connect the OUT pin of the PIR sensor to digital pin 2 of the Arduino.

Solution

void setup() {
  Serial.begin(9600);
  pinMode(2, INPUT);
  pinMode(13, OUTPUT);
}
void loop() {
  int sensorValue = digitalRead(2);
  Serial.println(sensorValue);
  if (sensorValue == HIGH) {
    digitalWrite(13, HIGH);
  } else {
    digitalWrite(13, LOW);
  }
  delay(100);
}

Output

pinMode(pirSensorPin, INPUT);: Configures the pin connected to the PIR sensor as an input.

digitalRead(pirSensorPin);: Reads the value from the PIR sensor. It returns HIGH if motion is detected and LOW if no motion is detected.

Serial.println(sensorValue);: Prints the sensor value to the Serial Monitor.

digitalWrite(ledPin, HIGH);: Turns on the built-in LED when motion is detected.

digitalWrite(ledPin, LOW);: Turns off the built-in LED when no motion is detected.

Programming Examples

Arduino program to interface a PIR (Passive Infrared) sensor