Smart Dustbin  Arduino

In this project, I will show you How to Make a Smart Dustbin using Arduino,
where the lid of the dustbin will automatically open when you approach with trash. 
The other important components used to make this Smart Dustbin are an Ultrasonic Sensor and 
Servo Motor.

Arduino UNO 
Ultrasonic Sensor Module  
 Servo Motor  
Connecting Wires 
5V Power Supply  

Code
 Servo servo;   
int trigPin = 5;   
int echoPin = 6; 
int servoPin = 7;
int led= 10;
long duration, dist, average; 
long aver[3];   //array for average


void setup() {     
    Serial.begin(9600);
    servo.attach(servoPin); 
    pinMode(trigPin, OUTPUT); 
    pinMode(echoPin, INPUT); 
    servo.write(0);         //close cap on power on
    delay(100);
    servo.detach();
}

void measure() { 
 digitalWrite(10,HIGH);
digitalWrite(trigPin, LOW);
delayMicroseconds(5);
digitalWrite(trigPin, HIGH);
delayMicroseconds(15);
digitalWrite(trigPin, LOW);
pinMode(echoPin, INPUT);
duration = pulseIn(echoPin, HIGH);
dist = (duration/2) / 29.1;    //obtain distance
}
void loop() {
  for (int i=0;i<=2;i++) {   //average distance
    measure();             
   aver[i]=dist;           
    delay(10);              //delay between measurements
  }
 dist=(aver[0]+aver[1]+aver[2])/3;   

if ( dist<50 ) {
//Change distance as per your need
 servo.attach(servoPin);
  delay(1);
 servo.write(0); 
 delay(3000);     
 servo.write(150);   
 delay(1000);
 servo.detach();     
}
Serial.print(dist);
}