Arduino laser security trip wire for my vehicle

Projects Programming
17

Try it with this mod, the LED should light when the sensor trips:

/*     Arduini PIR Motion Sensor Tutorial
 *     
 *  by Dejan Nedelkovski, www.HowToMechatronics.com
 * 
 */
int pirSensor = 8;
int relayInput = 7;
int LED = 13;
void setup() {
  pinMode(pirSensor, INPUT);
  pinMode(relayInput, OUTPUT);
  pinMode(LED,OUTPUT);
}
void loop() {
  int sensorValue = digitalRead(pirSensor);
  if (sensorValue == 1) {
    digitalWrite(relayInput, LOW); // The Relay Input works Inversly
  }
 digitalWrite(LED,sensorValue);
}