int echoPin = 22;
int trigPin = 23;

void setup() {
  Serial.begin(115200);
  pinMode(echoPin, INPUT);
  pinMode(trigPin, OUTPUT);
}

void loop() {
  delay(100);

  digitalWrite(trigPin, HIGH);
  digitalWrite(trigPin, LOW);

  Serial.println(map(pulseIn(echoPin, HIGH), 117, 23526, 2, 400));
}