int led_Redin = 5; //red


int trigPin = 9;
int echoPin = 10;
long duration;
int distance;

void setup() {
  // put your setup code here, to run once:
 
  pinMode(5, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(trigPin,LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);

    duration = pulseIn(echoPin, HIGH);
  distance = (0.034*duration)/2;

    if (distance >= 100) {
    
        digitalWrite(5, HIGH);
        delay(5000);
        digitalWrite(5, LOW);

    }
      else{
     digitalWrite(5, LOW);
  
      }
}