#define echo 2
#define trig 3



void setup() {
  pinMode(echo, INPUT);
  pinMode(trig, OUTPUT);
  for(int i=4; i<= 13; i++){
    pinMode(i , OUTPUT);
  }
  Serial.begin(9600);

}

void loop() {
  digitalWrite(trig, LOW);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);
  delayMicroseconds(2);
  int temps= pulseIn(echo, HIGH);
  int distance= (temps/2) * 0.0343 ;
  Serial.print("la distance est: ");
  Serial.println(distance);
  int n= map(distance, 2, 400, 4, 13 );
  for(int i=4; i<= n; i++){
    digitalWrite(i, HIGH);
    delay(200);
    digitalWrite(i, LOW);
  }
  
  
}