int pinR = 3;
int pinG = 5;
int pinB = 6;
int pinTRIG = 8;
int pinECHO = A0;

void setup() {
  // put your setup code here, to run once:
pinMode(pinTRIG, OUTPUT);
pinMode(pinECHO, INPUT);
pinMode(pinR, OUTPUT);
pinMode(pinG, OUTPUT);
pinMode(pinB, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(pinTRIG, LOW);
digitalWrite(pinTRIG, HIGH);
int value = pulseIn(pinECHO, HIGH);
digitalWrite(pinR, HIGH);
digitalWrite(pinG, LOW);
digitalWrite(pinB, LOW);
delay(value);
digitalWrite(pinR, LOW);
digitalWrite(pinG, HIGH);
digitalWrite(pinB, LOW);
delay(value);
digitalWrite(pinR, LOW);
digitalWrite(pinG, LOW);
digitalWrite(pinB, HIGH);
delay(value);
}