int ir = 2;
int led = 3;


void setup(){
  Serial.begin(9600);
  pinMode(ir,INPUT);
  pinMode(led, OUTPUT);
}



void loop(){
int sensorstate = digitalRead(ir);
if (sensorstate == 1 ){
Serial.println("sensor on ");
digitalWrite(led, LOW);

}
if (sensorstate == 0){
Serial.println("sensor off");
digitalWrite(led, HIGH);
delay(1000);
}
}