Soda Can Alarm

#include <Servo.h> //include the servo library

#define trig 6 // we used pin 6 for the trig pin, and pi
#define echo 5   


int x = 17; // (in cm), measure how long the distance between object and ultrasonic sensor 
int distance;  // variable to save the distance you get from getdistance function



Servo myservo;

void setup(){
  pinMode(trig, OUTPUT); // setup trig and echo 
  pinMode(echo, INPUT);
  myservo.attach(9); // attack servo to pin number 9
  Serial.begin(9600);// begin serial monitor
}


void loop(){
    distance = getdistance(); // get the distance from function
    Serial.print("Distance:"); // print Distance 
    Serial.println(distance); // print on the same line as distance
                              // it put the value of the distance in cm
  
   if(distance <= x){          // if distance less than equal to x
      myservo.write(180); // turn servo 180 degree
      delay(1000);        // delay 1 second
      myservo.write(0);   // turn servo back to it's original position
      delay(1000);        // delay 1 second
    }
    else if(distance >= x){  // if distance more than equal to x
                          // do nothing
    }
    delay(50); // delay loops for 50 second
}
    

float getdistance(){ // function to get distance from sensor

  unsigned long duration; 
  float calculatedDistance; // add duration and calculatedDistance as variable
 
  digitalWrite(trig, LOW); // send signal to object
  delayMicroseconds(10);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);


  duration = pulseIn(echo, HIGH); // receive the signal
  calculatedDistance = duration*0.034/2;
  // from send to receive signal we get the time and 
  // put the equation s = v*t (v= 0.034 the speed of sound)
  // divided by two in order to get the real distance 
  return calculatedDistance; // return the distance to loop
  
}