#include "DMXSerial.h"
int PWM = 9;   // PMX analogWrit pin No.
int startCh = 1; // DMX start address

void setup(){
  DMXSerial.init(DMXReceiver);
  pinMode(13, OUTPUT);
}

void loop(){
  unsigned long lastPacket = DMXSerial.noDataSince();

  if (lastPacket < 5000) {
    byte dmx[4];
    for (int i = 0; i < 4; i++)
      dmx[i] = DMXSerial.read(startCh + i);

    analogWrite(PWM, dmx[0]);
  }
}