// HC-SR04
int trig = 3;
int echo = 2;
long duration = 0;
int cm = 0;
int inch = 0;

int B=11; int G=12; int R=13;

int led[4] ={LOW , 11 ,12 ,13};

void setup() {
  
  for (int i =11 ;i<14 ;i++){
    pinMode(led[i], OUTPUT);
  }
}

void loop() {
  for(int i=11;i<14;i++){
    digitalWrite(i, HIGH);
    delay(10);};
}