#define trigPin 9

void setup() {
  // put your setup code here, to run once:

pinMode(9,OUTPUT);
pinMode(8,INPUT);
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:

long distance, duration;

digitalWrite(9,LOW);
delayMicroseconds(2);
digitalWrite(9, HIGH);
delayMicroseconds(10);
digitalWrite(9, LOW);

duration = pulseIn(8,HIGH);
distance = (duration/2) /29.1;

if (distance <=10) {
Serial.print(distance);
Serial.println("cm");
Serial.println("Bin is open");

} else {

Serial.print(distance);
Serial.println("cm");
Serial.println("Bin is closed");

}

delay(1000);

}