// HC-SR04 Ultrasonic Sensor Example


#define ECHO 4
#define TRIG 3


const int pins[] = {9, 10, 11, 12,13};



void setup() {
  Serial.begin(115200);
  pinMode (TRIG, OUTPUT);
  pinMode(ECHO, INPUT);
}

void loop() {
  // Start a new measurement:
  digitalWrite(TRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG, LOW);

  // Read the result:
  int duration = pulseIn(ECHO, HIGH);
  Serial.print("Distance in CM: ");
  Serial.println(duration / 58);
  Serial.print("Distance in inches: ");
  Serial.println(duration / 148);

  delay(1000);
}





/*

  {


  #define ECHO_PIN 2
  #define TRIG_PIN 3

  Serial.begin(115200);
  pinMode(LED_BUILTIN, OUTPUT );

  }
  float readDistanceCM() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);
  return duration * 0.034 / 2;
  }

  void loop() {
  float distance = readDistanceCM();

  bool isNearby = distance < 100;
  digitalWrite(LED_BUILTIN, isNearby);

  Serial.print("Measured distance: ");
  Serial.println(readDistanceCM());

  delay(100) ;}
 **/