const int trigPin = 5;
const int echoPin = 18;
const int trigPin1 = 21;
const int echoPin1 = 22;
#define SOUND_SPEED 0.034
#define CM_TO_INCH 0.393701

long duration;
long duration1;
float distance;
float distance1;
float distanceCm;
float distanceCm1;
float distanceInch;
float distanceInch1;

void setup() {
  Serial.begin(115200); 
  pinMode(trigPin, OUTPUT); 
  pinMode(echoPin, INPUT); 
  pinMode(trigPin1, OUTPUT);
  pinMode(echoPin1, INPUT);
}

void loop() {
  
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
   digitalWrite(trigPin, LOW);
  digitalWrite(trigPin1, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin1, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin1, LOW);
 
  duration = pulseIn(echoPin, HIGH);
  duration1 = pulseIn(echoPin1, HIGH);
 
  distanceCm = duration * SOUND_SPEED/2;
  distanceCm1 = duration1 * SOUND_SPEED/2;
  distanceInch = distanceCm * CM_TO_INCH;
  distanceInch1 = distanceCm1 * CM_TO_INCH;
 
  Serial.print("Distance (cm): ");
  Serial.println(distanceCm);
  Serial.print("Distance (inch): ");
  Serial.println(distanceInch);
  Serial.print("Distance1 (cm): ");
  Serial.println(distanceCm1);
  Serial.print("Distance1 (inch): ");
  Serial.println(distanceInch1);
  delay(100);
}