lights.ino

class Blinker {
  public:
    Blinker(int pin, float periodSeconds, float onSeconds = 0.5, float delayUntilStart = 0.0) {
      this->pin = pin;
      period = periodSeconds * 1000;
      onTime = onSeconds * 1000;
      offset = delayUntilStart * 1000;
      nextOn = millis() + offset;
      pinMode(pin, OUTPUT);
    }

    void poll() {
      if (millis() > nextOn) {
        digitalWrite(pin, HIGH);
        nextOn = nextOn + period;
      } else if (millis() + period - onTime > nextOn) {
        digitalWrite(pin, LOW);
      }
    }

  private:
    unsigned long period, onTime, offset;
    unsigned long nextOn;
    int pin;
};

Blinker *lightOne;
Blinker *lightTwo;

void setup() {
  lightOne = new Blinker(10, 15, 0.5);
  lightTwo = new Blinker(11, 20, 0.5);
}

void loop() {
  lightOne->poll();
  lightTwo->poll();
}