void setup() {
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(outA, OUTPUT);
  digitalWrite(outA, LOW);
  pinMode(outB, OUTPUT);
  digitalWrite(outB, LOW);
 pinMode(outC, OUTPUT);
 digitalWrite(outC,LOW);
 Serial.begin(9600);
  }
void loop() {
  time_Measurement();
  distance=(float)duration*(0.0343)/2;
        //calculate the one way distance travelled by the pulse
Serial.println(distance);
alarm_condition();
}
void time_Measurement()
{       //function to measure the time taken by the pulse to return back
digitalWrite(trig,LOW);
delayMicroseconds(2);
digitalWrite(trig,HIGH);
delayMicroseconds(10);
digitalWrite(trig,LOW);
duration=pulseIn(echo,HIGH);
}
void alarm_condition()
{    //function to execute the output commands based on the sensor
INPUT
if(distance<=intruderDistance)
{
  digitalWrite(outA,HIGH);
  digitalWrite(outB,LOW);
  analogWrite(outC,200);
  else
  {
    digitalWrite(outA,LOW);
    digitalWrite(outB,HIGH);
    analogWrite(outC,0);
  }
}