#define echoPin A0
#define trigPin A1
#define LED1Pin 2
#define LED2Pin 3

int distance_FULL_BIN = 15;
long duration, distance;

void setup() {
  Serial.begin(9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(LED1Pin, OUTPUT);
  pinMode(LED2Pin, OUTPUT);
  digitalWrite(LED1Pin, 0);
  digitalWrite(LED2Pin, 1);
}


void loop() {
  ultrasonic();
}//end of Loop

void ultrasonic () {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 / 2;
  Serial.println(distance);
  delay(10);
  if (distance > distance_FULL_BIN) {
    digitalWrite(LED1Pin, 0);
    digitalWrite(LED2Pin, 1);
  }
  else {
    digitalWrite(LED1Pin, 1);
    digitalWrite(LED2Pin, 0);
  }
}