#define SOUND_SPEED 0.034

int ledRed = 32;
int ledOrange1 = 33;
int ledOrange2 = 25;
int ledGreen1 = 26;
int ledGreen2 = 27;
int ledGreen3 = 14;
const int trigPin = 5;
const int echoPin = 18;

long duration;
float distanceCm;


void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
  pinMode(echoPin, INPUT); // Sets the echoPin as an Input

  pinMode(ledRed, OUTPUT);
  pinMode(ledOrange1, OUTPUT);
  pinMode(ledOrange2, OUTPUT);
  pinMode(ledGreen1, OUTPUT);
  pinMode(ledGreen2, OUTPUT);
  pinMode(ledGreen3, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
 delay(10); // this speeds up the simulation
 
 // 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;
  
  switch (int(distanceCm)) {
    case 0 ... 10:
      digitalWrite(ledRed, HIGH);
      digitalWrite(ledOrange1, LOW);
      digitalWrite(ledOrange2, LOW);
      digitalWrite(ledGreen1, LOW);
      digitalWrite(ledGreen2, LOW);
      digitalWrite(ledGreen3, LOW);
      // Prints the distance in the Serial Monitor
      Serial.print("Distance (cm): ");
      Serial.println(distanceCm);
      break;

    case 11 ... 20:
      digitalWrite(ledRed, LOW);
      digitalWrite(ledOrange1, HIGH);
      digitalWrite(ledOrange2, LOW);
      digitalWrite(ledGreen1, LOW);
      digitalWrite(ledGreen2, LOW);
      digitalWrite(ledGreen3, LOW);
      // Prints the distance in the Serial Monitor
      Serial.print("Distance (cm): ");
      Serial.println(distanceCm);
      break;

    case 21 ... 30:
      digitalWrite(ledRed, LOW);
      digitalWrite(ledOrange1, LOW);
      digitalWrite(ledOrange2, HIGH);
      digitalWrite(ledGreen1, LOW);
      digitalWrite(ledGreen2, LOW);
      digitalWrite(ledGreen3, LOW);
      // Prints the distance in the Serial Monitor
      Serial.print("Distance (cm): ");
      Serial.println(distanceCm);
      break;

    case 31 ... 40:
      digitalWrite(ledRed, LOW);
      digitalWrite(ledOrange1, LOW);
      digitalWrite(ledOrange2, LOW);
      digitalWrite(ledGreen1, HIGH);
      digitalWrite(ledGreen2, LOW);
      digitalWrite(ledGreen3, LOW);
      // Prints the distance in the Serial Monitor
      Serial.print("Distance (cm): ");
      Serial.println(distanceCm);
      break;

    case 41 ... 50:
      digitalWrite(ledRed, LOW);
      digitalWrite(ledOrange1, LOW);
      digitalWrite(ledOrange2, LOW);
      digitalWrite(ledGreen1, HIGH);
      digitalWrite(ledGreen2, HIGH);
      digitalWrite(ledGreen3, LOW);
      // Prints the distance in the Serial Monitor
      Serial.print("Distance (cm): ");
      Serial.println(distanceCm);
      break;

    case 51 ... 80:
      digitalWrite(ledRed, LOW);
      digitalWrite(ledOrange1, LOW);
      digitalWrite(ledOrange2, LOW);
      digitalWrite(ledGreen1, LOW);
      digitalWrite(ledGreen2, HIGH);
      digitalWrite(ledGreen3, HIGH);
      // Prints the distance in the Serial Monitor
      Serial.print("Distance (cm): ");
      Serial.println(distanceCm);
      break;
    case 81 ... 400:
      digitalWrite(ledRed, LOW);
      digitalWrite(ledOrange1, LOW);
      digitalWrite(ledOrange2, LOW);
      digitalWrite(ledGreen1, HIGH);
      digitalWrite(ledGreen2, HIGH);
      digitalWrite(ledGreen3, HIGH);
      // Prints the distance in the Serial Monitor
      Serial.print("Distance (cm): ");
      Serial.println(distanceCm);
  
      break;

    default:
      digitalWrite(ledRed, LOW);
      digitalWrite(ledOrange1, LOW);
      digitalWrite(ledOrange2, LOW);
      digitalWrite(ledGreen1, LOW);
      digitalWrite(ledGreen2, LOW);
      digitalWrite(ledGreen3, LOW);
      // Prints the distance in the Serial Monitor
      Serial.print("Distance (cm): ");
      Serial.println(distanceCm);
      break;
  }


  
  delay(100);

}