PIR Motion Sensor for Arduino code example

Example: pir motion sensor arduino code

/* * PIR sensor tester */ int ledPin = 13;                // choose the pin for the LEDint inputPin = 2;               // choose the input pin (for PIR sensor)int pirState = LOW;             // we start, assuming no motion detectedint val = 0;                    // variable for reading the pin status void setup() {  pinMode(ledPin, OUTPUT);      // declare LED as output  pinMode(inputPin, INPUT);     // declare sensor as input   Serial.begin(9600);} void loop(){  val = digitalRead(inputPin);  // read input value  if (val == HIGH) {            // check if the input is HIGH    digitalWrite(ledPin, HIGH);  // turn LED ON    if (pirState == LOW) {      // we have just turned on      Serial.println("Motion detected!");      // We only want to print on the output change, not state      pirState = HIGH;    }  } else {    digitalWrite(ledPin, LOW); // turn LED OFF    if (pirState == HIGH){      // we have just turned of      Serial.println("Motion ended!");      // We only want to print on the output change, not state      pirState = LOW;    }  }}