int LED = 3;
int PIR = 2;

void setup() {

// initialize digital pin 3 as an output for LED

pinMode(LED, OUTPUT);

//initialize digital pin 2 as input for PIR

pinMode(PIR, INPUT);

//initialization time for PIR sensor to warm up

//blink LED to show that something is happening

for(int i = 0; i < 10; i++) {

digitalWrite(LED, LOW);

delay(3000);

digitalWrite(LED, HIGH);

delay(3000);

}

}

void loop() {

//read PIR sensor, if High light LED for 5 seconds

//if low, check again

if(digitalRead(PIR) == HIGH) {

digitalWrite(LED, HIGH);

delay(5000);

} else {

digitalWrite(LED, LOW);

}

}