// Define LED pins
const int greenLedPin = 7;
const int yellowLedPin = 6;
const int redLedPin = 5;
 
// Define blink intervals (in milliseconds)
const long greenBlinkInterval = 200;  // 0.2 seconds
const long yellowBlinkInterval = 500; // 0.5 seconds
const long redBlinkInterval = 1000;   // 1 second
 
void setup() {
  // Initialize LED pins as output
  pinMode(greenLedPin, OUTPUT);
  pinMode(yellowLedPin, OUTPUT);
  pinMode(redLedPin, OUTPUT);
 
  Serial.begin(115200);
  Serial.println("Unitask LED Blink Demo");
}
 
void loop() {
  // --- Green LED Blink ---
  digitalWrite(greenLedPin, HIGH);
  Serial.println("Green LED ON");
  delay(greenBlinkInterval);
  digitalWrite(greenLedPin, LOW);
  Serial.println("Green LED OFF");
  delay(greenBlinkInterval);
 
  // --- Yellow LED Blink ---
  digitalWrite(yellowLedPin, HIGH);
  Serial.println("Yellow LED ON");
  delay(yellowBlinkInterval);
  digitalWrite(yellowLedPin, LOW);
  Serial.println("Yellow LED OFF");
  delay(yellowBlinkInterval);
 
  // --- Red LED Blink ---
  digitalWrite(redLedPin, HIGH);
  Serial.println("Red LED ON");
  delay(redBlinkInterval);
  digitalWrite(redLedPin, LOW);
  Serial.println("Red LED OFF");
  delay(redBlinkInterval);
}