RGB LED

const int ledA0 = A0;  // LED on pin A0
const int led9 = 9;    // LED on pin 9
const int led8 = 8;    // LED on pin 8

void setup() {
  // Set the LED pins as OUTPUT
  pinMode(ledA0, OUTPUT);
  pinMode(led9, OUTPUT);
  pinMode(led8, OUTPUT);
}

void loop() {
  // Turn on LED at A0 and turn off others
  digitalWrite(ledA0, HIGH);
  digitalWrite(led9, LOW);
  digitalWrite(led8, LOW);
  delay(1000);  // Wait 1 second

  // Turn on LED at 9 and turn off others
  digitalWrite(ledA0, LOW);
  digitalWrite(led9, HIGH);
  digitalWrite(led8, LOW);
  delay(1000);  // Wait 1 second

  // Turn on LED at 8 and turn off others
  digitalWrite(ledA0, LOW);
  digitalWrite(led9, LOW);
  digitalWrite(led8, HIGH);
  delay(1000);  // Wait 1 second
}