int led_R = 11;
int led_G = 6;
int led_B = 2;



void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(led_R, OUTPUT);
  pinMode(led_G, OUTPUT);
  pinMode(led_B, OUTPUT);
   }

// the loop function runs over and over again forever
void loop() {
  digitalWrite(led_R, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(500);                       // wait for a second
  digitalWrite(led_G, HIGH);    // turn the LED off by making the voltage LOW
  delay(500);    
  digitalWrite(led_B, HIGH);    // turn the LED off by making the voltage LOW
  delay(500); 
  digitalWrite(led_R, LOW);   // turn the LED on (HIGH is the voltage level)
  delay(500);                       // wait for a second
  digitalWrite(led_G, LOW);    // turn the LED off by making the voltage LOW
  delay(500);   
  digitalWrite(led_B, LOW);    // turn the LED off by making the voltage LOW
  delay(500); 
  
  
  
                     // wait for a second
}