// Pins
const int TRIG_PIN = 7;
const int ECHO_PIN = 8;

const unsigned int MAX_DIST = 200;

void setup() {

  pinMode(TRIG_PIN, OUTPUT);
  digitalWrite(TRIG_PIN, LOW);

  pinMode(ECHO_PIN, INPUT);

  Serial.begin(9600);
}

void loop() {

  int distance;

  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  while ( digitalRead(ECHO_PIN) == 1);
  distance = random(0,180);
  if ( distance <100 )
  {
    Serial.println("distance: ");
    Serial.print(distance);
    Serial.println("\t Object is NEAR, Buzzer: ON");
    
  }
   else 
   {
     Serial.println("distance: ");
     Serial.print(distance);
     Serial.println("\t Object Not Found, Buzzer: OFF");
  }
  delay(700);
}