#define SOUND_SPEED 0.034
#define TIMEOUT 30000 

const int trigPinL = 33;
const int echoPinL = 32;

const int trigPinR = 15;
const int echoPinR = 18;  

long durationL, durationR;
float distanceCmL, distanceCmR;

void setup() {
  Serial.begin(115200); 
  pinMode(trigPinL, OUTPUT);
  pinMode(echoPinL, INPUT);

  pinMode(trigPinR, OUTPUT);
  pinMode(echoPinR, INPUT);
}

void loop() {
 
  digitalWrite(trigPinL, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPinL, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPinL, LOW);

  durationL = pulseIn(echoPinL, HIGH, TIMEOUT);
  distanceCmL = (durationL > 0) ? (durationL * SOUND_SPEED / 2) : -1;  

  delay(50);

  digitalWrite(trigPinR, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPinR, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPinR, LOW);

  durationR = pulseIn(echoPinR, HIGH, TIMEOUT);
  distanceCmR = (durationR > 0) ? (durationR * SOUND_SPEED / 2) : -1;

  Serial.println("Distance (cm):");
  Serial.print("Right: ");
  Serial.println(distanceCmR);
  Serial.print("Left: ");
  Serial.println(distanceCmL);

  delay(500);
}