#define trigPin1 3
#define echoPin1 2

#define trigPin2 4
#define echoPin2 5

#define trigPin3 7
#define echoPin3 8

long duration, distance, RightSensor,BackSensor,FrontSensor,LeftSensor;

void setup()
{
Serial.begin (9600);
pinMode(trigPin1, OUTPUT);
pinMode(echoPin1, INPUT);
pinMode(trigPin2, OUTPUT);
pinMode(echoPin2, INPUT);
pinMode(trigPin3, OUTPUT);
pinMode(echoPin3, INPUT);
}

void loop() {
SonarSensor(trigPin1, echoPin1);
RightSensor = distance;
SonarSensor(trigPin2, echoPin2);
LeftSensor = distance;
SonarSensor(trigPin3, echoPin3);
FrontSensor = distance;

 /*

*/
if (LeftSensor < 130 ||  FrontSensor < 130 || RightSensor < 130)
{
  Serial.print(LeftSensor);
  Serial.print(" - ");
  Serial.print(FrontSensor);
  Serial.print(" - ");
  Serial.println(RightSensor);
  Serial.println("hit");
}

}

void SonarSensor(int trigPin,int echoPin)
{
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
distance = (duration/2) / 29.1;

}