Arduino laser security trip wire for my vehicle

Projects Programming
16

So im not sure why but this code isn't working with mysetup.

I have the signal pin from the PIR sensor conneted to pin8 and the relay signal wire connected to pin7.
The relay and PIR sensor are wired to 5v and Gnd.

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