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.

void setup() {
  // Initialize the Serial Monitor at a baud rate of 9600
  Serial.begin(9600);
  
  // Set the PIR sensor pin as input
  pinMode(2, INPUT);

  // Set the built-in LED pin as output
  pinMode(13, OUTPUT);
}

void loop() {
  // Read the value from the PIR sensor
  int sensorValue = digitalRead(2);
  
  // Print the sensor value to the Serial Monitor
  Serial.println(sensorValue);

  // If motion is detected, turn on the LED
  if (sensorValue == HIGH) {
    digitalWrite(13, HIGH);
  } else {
    digitalWrite(13, LOW);
  }
  
  // Add a small delay to avoid overwhelming the Serial Monitor
  delay(100);
}

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.