int red=10;
int green=9;
int blue=8;
void setup() {
  pinMode(red, OUTPUT);
  pinMode(green, OUTPUT);
  pinMode(blue, OUTPUT);
}

void loop() {
 analogWrite(red, 255);
 analogWrite(green, 0);
 analogWrite(blue, 0);
 delay(1000);
 analogWrite(red, 0);
 analogWrite(green, 255);
 analogWrite(blue, 0);
 delay(1000);
 analogWrite(red, 0);
 analogWrite(green, 0);
 analogWrite(blue, 255);
 delay(1000);
}