#define TRIG_PIN  23 //input
#define ECHO_PIN  22 //output

void setup() {
  // put your setup code here, to run once:
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  Serial.begin(115200);
  // Serial.println("Hello, ESP32!");
}

float readDistance(){
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);
  float distance = duration * 0.034 / 2;
  return distance;
}
void loop() {
  // put your main code here, to run repeatedly:
  float distance = readDistance();

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

  delay(100);
  

}

//single quote - single character