#define ECHOPIN 9        // Pin to receive echo pulse 
#define TRIGPIN 10        // Pin to send trigger pulse
float distance=0;

#define ECHOPIN_1 7        // Pin to receive echo pulse 
#define TRIGPIN_1 8        // Pin to send trigger pulse
float distance_1=0;

#define ECHOPIN_2 6      // Pin to receive echo pulse 
#define TRIGPIN_2 5        // Pin to send trigger pulse
float distance_2=0;


int Mubarak (){
  // Start Ranging -Generating a trigger of 10us burst 
  digitalWrite(TRIGPIN, LOW); 
  delayMicroseconds(2); 
  digitalWrite(TRIGPIN, HIGH); 
  delayMicroseconds(10); 
  digitalWrite(TRIGPIN, LOW);
  // Distance Calculation
  distance = pulseIn(ECHOPIN, HIGH); 
  distance= distance/58; 
/* The speed of sound is 340 m/s or 29 us per cm.The Ultrasonic burst travels out & back.So to find the distance of object we divide by 58  */
  Serial.print(distance); 
  Serial.println(" cm");
  delay(200);


}

int Mubarak_1 (){
  // Start Ranging -Generating a trigger of 10us burst 
  digitalWrite(TRIGPIN_1, LOW); 
  delayMicroseconds(2); 
  digitalWrite(TRIGPIN_1, HIGH); 
  delayMicroseconds(10); 
  digitalWrite(TRIGPIN_1, LOW);
  // Distance Calculation
  distance_1 = pulseIn(ECHOPIN_1, HIGH); 
  distance_1= distance_1/58; 
/* The speed of sound is 340 m/s or 29 us per cm.The Ultrasonic burst travels out & back.So to find the distance of object we divide by 58  */
  Serial.print(distance_1); 
  Serial.println(" cm");
  delay(200);


}
int Mubarak_2 (){
  // Start Ranging -Generating a trigger of 10us burst 
  digitalWrite(TRIGPIN_2, LOW); 
  delayMicroseconds(2); 
  digitalWrite(TRIGPIN_2, HIGH); 
  delayMicroseconds(10); 
  digitalWrite(TRIGPIN_2, LOW);
  // Distance Calculation
  distance_2 = pulseIn(ECHOPIN_2, HIGH); 
  distance_2= distance_2/58; 
/* The speed of sound is 340 m/s or 29 us per cm.The Ultrasonic burst travels out & back.So to find the distance of object we divide by 58  */
  Serial.print(distance_2); 
  Serial.println(" cm");
  delay(200);


}

void setup() 
{ 
  Serial.begin(9600);
  pinMode(ECHOPIN, INPUT);
  pinMode(TRIGPIN, OUTPUT); 

   pinMode(ECHOPIN_1, INPUT);
  pinMode(TRIGPIN_1, OUTPUT); 

     pinMode(ECHOPIN_2, INPUT);
  pinMode(TRIGPIN_2, OUTPUT);
}
void loop() 
{ 
Mubarak ();
Mubarak_1 ();
Mubarak_2 ();
}