/**********************************************************************************************************
*
* Title			    : DMX Switch pack with 2 relays and dipswitch for addressing
* Version		    : 1.0 
* Last updated	: 08-02-2013
* Target		    : ATmega328 @ 16Mhz.
* Author        : Guillaume A. Galenkamp
*
***********************************************************************************************************/
#include <DMXSerial.h> // library: http://www.mathertel.de/Arduino/DMXSerial.aspx 

#define led               4   // RxD led connected to Arduino pin 4
#define relay1            3   // Relay 1 connected to Arduino pin 3
#define relay2            2   // Relay 2 connected to Arduino pin 2
#define dipSwitch9        5   // Dipswitch 9 connected to Arduino pin 5

byte valueCH1; // Buffer CH1
byte valueCH2; // Buffer CH2

int dipPins[] = {9, 8, 7, 6, 5, 4, 3, 2};  // DIP switch pins
int startAddress;
int i,j;

void setup() {
  pinMode(led_PIN, OUTPUT);             // Set digital pin as output for the DMX OK led
  pinMode(relay1_PIN, OUTPUT);          // Set digital pin as output for relay 1
  pinMode(relay2_PIN, OUTPUT);          // Set digital pin as output for relay 2
  for (int i=0; i <= 7; i++) {          // Configures the digital pins to behave as an input (Arduino pins 4~13)
    pinMode(dipPins[i], INPUT);
  }
  DMXSerial.init(DMXReceiver);          // Set to DMX Receiver
} 

// Create address from DIP Switch 
int address(){
  for(i=0; i<=7; i++){
    j = (j << 1) | digitalRead(dipPins[i]);  // read the input pin
  }
  return j; //return address
} 

void readAddress() { 
  startAddress = dipswitch(), DEC;  // Read the 8 bit start addres 
  dip9_State = digitalRead(dipSwitch9);  // Add the other 256 later
  if (dip9_State == HIGH) { 
    startAddress = startAddress + 256;
  } else {
    startAddress = startAddress + 0;
  }  
  if (startAddress == 0) {  // If dipswitches are off, set start address to 1
    startAddress ++;
  }
  startAddress = constrain(startAddress, 0, 511); // contrain it to 511 ch. because of 2ch. input
}

// The infinite loop
void loop() {
  readAddress(); // Read the start address
  // Output 1
  if (valueCH1 >= 127) {  // DMX value (50%) at which relays switches on (0..255)
    digitalWrite(relay1, HIGH);
  } else {
    digitalWrite(relay1, LOW);
  }
  // Output 2
  if (valueCH2 >= 127) {
    digitalWrite(relay2, HIGH);
  } else {
    digitalWrite(relay2, LOW);
  }

  // Calculate how long no data backet was received
  unsigned long lastPacket = DMXSerial.noDataSince();
  // turn data led on when packets are received
  if (lastPacket < 1000) {
    digitalWrite(led, HIGH);
  } else {
    // Turn off data led, when no data was received after 1 second.
    digitalWrite(led, LOW); 
  }
} // End of loop