int led_R = 8;

int led_G = 9;
int led_B = 10;

void setup() {  
pinMode(led_R,OUTPUT)
pinMode(led_G, OUTPUT)
pinMode(led_B, OUTPUT)
}

void loop() {
 digitalRead(led_R,1)
digitalRead(led_G,0)
digitalRead(led_B,0)
delay(1000);

digitalRead(led_R,0)
digitalRead(led_G,1)
digitalRead(led_B,0)
delay(1000);

digitalRead(led_R 0)
digitalRead(led_G 0)
digitalRead(led_B,1)
delay(1000);
}