const uint8_t TRIG_PIN = 2;
const uint8_t ECHO_PIN = 3;

void setup() {
  Serial.begin(115200);

  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT_PULLUP);
}

int convertToCentimeters(int duration) {
  return (duration / 58);
}

int convertToInch(int duration) {
  return (duration / 148);
}

void loop() {
  // 新たな測定を開始
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  // 測定結果を取得
  int duration = pulseIn(ECHO_PIN, HIGH);

  Serial.print("現在の距離: ");
  Serial.print(convertToCentimeters(duration));
  Serial.print("[cm] / ");
  Serial.print(convertToInch(duration));
  Serial.println("[in]");

  delay(1000);
}