const int trigPin = 8;
const int echoPin = 9;
const int led=13;
const int buzzer=7;
void setup() {
  Serial.begin(9600);
  Serial.print("Distance:\n");
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(led, OUTPUT);
  pinMode(buzzer, OUTPUT);
}

void loop() {
  long duration, distance;
  digitalWrite(buzzer, LOW);
  delayMicroseconds(2);
  digitalWrite(led, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 / 2;
  if(distance > 350)
  {
      digitalWrite(led, HIGH);
      digitalWrite(buzzer, HIGH);

  }
  Serial.print(distance);
  Serial.print("cm\n");
  delay(1000);  
}