#define TRIGGER 3
#define ECHO 2
uint16_t cm_cal;
uint8_t r_led=13;
uint8_t g_led=12;
uint8_t b_led=11;
void setup() {
  Serial.begin(9600);
  pinMode(TRIGGER, OUTPUT);
  pinMode(ECHO, INPUT);
  pinMode(r_led,OUTPUT);
  pinMode(g_led,OUTPUT);
  pinMode(b_led,OUTPUT);
}
void loop() {
  digitalWrite(TRIGGER, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIGGER, LOW);
  uint16_t duration = pulseIn(ECHO, HIGH);
  cm_cal=duration/58;
  Serial.println(cm_cal);
  analogWrite(r_led,00);
  analogWrite(g_led,00);
  analogWrite(b_led,00);
  delay(1000);
  if(cm_cal>100)
  {
    analogWrite(r_led,255);
    delay(100);
    analogWrite(r_led,0);
    delay(500);
    Serial.println("1");
  }
  if(cm_cal<100 && cm_cal>=50)
  {
    analogWrite(g_led,255);
    delay(100);
    analogWrite(g_led,0);
    delay(500);
    Serial.println("0");
  }
  if(cm_cal<50)
  {
    analogWrite(b_led,255);
    delay(100);
    analogWrite(b_led,0);
    delay(500);
    Serial.println("3");
  }
}