PPM-Signal erklärung

#define chanel_number 8  //Channels Anzahl

#define default_ppm_value 1500 //Anfangswerte der Channels

#define PPM_FrLen 22500  //set the PPM frame length in microseconds (1ms = 1000µs)

#define PPM_PulseLen 300  //set the pulse length

#define onState 0  //set polarity of the pulses: 1 is positive, 0 is negative

#define sigPin 31  //set PPM signal output pin on the arduino

#define off 0 // Wert für den PPM Channel wenn er aus ist

#define on 2000 // Wert für den PPM Channel wenn er an ist

 cli();

  TCCR1A = 0; // set entire TCCR1 register to 0

  TCCR1B = 0;

  OCR1A = 100;  // compare match register, change this

  TCCR1B |= (1 << WGM12);  // turn on CTC mode

  TCCR1B |= (1 << CS11);  // 8 prescaler: 0,5 microseconds at 16mhz

  TIMSK1 |= (1 << OCIE1A); // enable timer compare interrupt

  sei();

ISR(TIMER1_COMPA_vect) { //leave this alone

  static boolean state = true;

  TCNT1 = 0;

  if (state) { //start pulse

    digitalWrite(sigPin, onState);

    OCR1A = PPM_PulseLen * 2 ;

    state = false;

  }

  else { //end pulse and calculate when to start the next pulse

    static byte cur_chan_numb;

    static unsigned int calc_rest;

    digitalWrite(sigPin, !onState);

    state = true;

    if (cur_chan_numb >= chanel_number) {

      cur_chan_numb = 0;

      calc_rest = calc_rest + PPM_PulseLen;

      OCR1A = (PPM_FrLen - calc_rest)*2;

      calc_rest = 0;

    }

    else {

      OCR1A = (ppm[cur_chan_numb]- PPM_PulseLen)*2;

      calc_rest = calc_rest + ppm[cur_chan_numb];

      cur_chan_numb++;

    }

  }

}