#define Red 12
#define Green 11
#define Blue 10

void setup() {
  pinMode(Red, OUTPUT);
  pinMode(Green, OUTPUT);
  pinMode(Blue, OUTPUT);
}
void loop() {
 digitalWrite(Red,1);
 delay(1000);
 digitalWrite(Red,0);
 digitalWrite(Green,1);
 delay(1000);
 digitalWrite(Green,0);
 digitalWrite(Blue,1);
 delay(1000);
 digitalWrite(Blue,0);
}