class Blinker {
private:
    int ledPin;
    unsigned long onTime;
    unsigned long offTime;
    unsigned long lastChange;
    bool isOn;

public:
    Blinker(int pin, unsigned long on, unsigned long off)
        : ledPin(pin), onTime(on), offTime(off), lastChange(0), isOn(false) {
        pinMode(ledPin, OUTPUT);
    }

    void update() {
        unsigned long currentMillis = millis();
        unsigned long interval = isOn ? onTime : offTime;

        if (currentMillis - lastChange >= interval) {
            isOn = !isOn;
            digitalWrite(ledPin, isOn ? HIGH : LOW);
            lastChange = currentMillis;
        }
    }
};

Blinker led1(3, 100, 200); 
Blinker led2(4, 400, 400); 
Blinker led3(5, 200, 600);

void setup() {
}

void loop() {
    led1.update();
    led2.update();
    led3.update();
}