DutyCycle.h

typedef struct{
    byte pin;
    volatile short timeHigh;
    volatile short timeLow;
    volatile long lastFalling;
    volatile long lastRising;
    
    void dutyCycleUpdate(){
      switch(digitalRead(this->pin)){
        case HIGH:
          this->lastRising = micros();
          this->timeLow = this->lastRising - this->lastFalling;
          break;
        case LOW:
          this->lastFalling = micros();
          this->timeLow = this->lastFalling - this->lastRising;
          break;
      }
    }

    byte checkDutyCycle(){
      return map(this->timeHigh, 0, this->timeLow + this->timeHigh, 0, 255);
    }
    
} DutyCycle;