#define trigPin 11
#define echoPin 12
#define SOUND_SPEED 0.034


long duration;
float distanceCm;

void setup() {
  // put your setup code here, to run once

  Serial.begin(115200);
  Serial.println("Hello, ESP32-S2!");
  pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
  pinMode(echoPin, INPUT); // Sets the echoPin as an Input
}

void loop() {
  // put your main code here, to run repeatedly:
     // Clears the trigPin

  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  // Sets the trigPin on HIGH state for 10 micro seconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  // Reads the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin, HIGH);
  
  // Calculate the distance
  distanceCm = duration * SOUND_SPEED/2;

  // Prints the distance in the Serial Monitor
  Serial.print("Distance (cm): ");
  Serial.println(distanceCm);

  
  delay(5000);

  delay(10); // this speeds up the simulatio
}