/* Utilisation du capteur Ultrason HC-SR04 */

// définition des broches utilisées
int trigA = 7;
int echoA = 6;

int trigB = 7;
int echoB = 5;
long timeAB;
long timeBA;
long C;
long V;
long speedofsoundmps = 340;

void setup()
{
  pinMode(trigA, OUTPUT);
  digitalWrite(trigA, LOW);
  pinMode(echoA, INPUT);
  
  pinMode(trigB, OUTPUT);
  digitalWrite(trigB, LOW);
  pinMode(echoB, INPUT);
  Serial.begin(9600);
}

void loop()
{
  digitalWrite(trigA, LOW);
  delayMicroseconds(2);
  digitalWrite(trigA, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigA, LOW);
  timeAB = pulseIn(echoB, HIGH);
  //timeAB = timeAB-40;
  //Serial.println("Temps AB : ");
  //Serial.println(timeAB);

  delay(100);

  digitalWrite(trigB, LOW);
  delayMicroseconds(2);
  digitalWrite(trigB, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigB, LOW);
  timeBA = pulseIn(echoA, HIGH);
  //timeBA = timeBA-40;
  //Serial.println("Temps BA : ");
  //Serial.println(timeBA);


  C = (0.45/2)*((1e6/timeAB)+(1e6/timeBA));
  V = (0.45/2)*((1e6/timeAB)-(1e6/timeBA));
  //Serial.println("Vitesse c : ");
  //Serial.println(C); 
  //Serial.println() ;
  Serial.println("Vitesse du vent V : ");
  Serial.println(V);
  Serial.println();
  //Serial.println();
  //Serial.println();
  delay(1000);
}