/*
 * GrowBox
 *
 */

#define READ_ANALOG A
#define SET_DIGITAL D
#define TURN_LIGHT_ON 1
#define TURN_LIGHT_OFF 2
#define TURN_HEATER_ON 3
#define TURN_HEATER_OFF 4
#define TURN_EXHAUST_FAN_ON 5
#define TURN_EXHAUST_FAN_OFF 6
#define TURN_WATER_PUMP_ON 7
#define TURN_WATER_PUMP_OFF 8

#define PIN_LIGHTS 13         // SSR connected to digital pin 13
#define PIN_EXHAUST_FAN 12     // SSR connected to digital pin 12
#define PIN_WATER_PUMP 11      // SSR connected to digital pin 11
#define PIN_HEATER 10         // SSR connected to digital pin 10

int incomingByte = 0;	    // for incoming serial data
char serInString[11];

// DS18S20 Temperature chip i/o
OneWire ds(10);  // on pin 10
int HighByte, LowByte, TReading, SignBit, Tc_100, Tf_100, Whole, Fract;

void setup()
{
  Serial.begin(9600);

  // Power control
  pinMode(PIN_LIGHTS, OUTPUT);        // sets the digital pin as output
  pinMode(PIN_EXHAUST_FAN, OUTPUT);    // sets the digital pin as output
  pinMode(PIN_WATER_PUMP, OUTPUT);     // sets the digital pin as output
  pinMode(PIN_HEATER, OUTPUT);        // sets the digital pin as output
}

void loop()
{

  readSerialString(serInString);

  if (serInString[0] != 0) 
  {
    switch(serInString[0])
    {
    case READ_ANALOG:
      Serial.println(analogRead(serInString[0]));           
    case SET_DIGITAL:
      
    case TURN_LIGHT_ON:
      digitalWrite(PIN_LIGHTS, HIGH);   // Turn Lights On
    case TURN_LIGHT_OFF:
      digitalWrite(PIN_LIGHTS, LOW);   // Turn Lights Off
    case TURN_HEATER_ON:
      digitalWrite(PIN_HEATER, HIGH);   // Turn Heater On
    case TURN_HEATER_OFF:
      digitalWrite(PIN_HEATER, LOW);   // Turn Heater Off        
    case TURN_EXHAUST_FAN_ON:
      digitalWrite(PIN_EXHAUST_FAN, HIGH);   // Turn Exhaust Fan On
    case TURN_EXHAUST_FAN_OFF:
      digitalWrite(PIN_EXHAUST_FAN, LOW);   // Turn Exhaust Fan Off   
    case TURN_WATER_PUMP_ON:
      digitalWrite(PIN_WATER_PUMP, HIGH);   // Turn Water Pump On
    case TURN_WATER_PUMP_OFF:
      digitalWrite(PIN_WATER_PUMP, LOW);   // Turn Water Pump Off   
    }
    
    for (int i=0; i <= 3; i++)
    {
      serInString[i]=0;
    }

  }

  delay(5000);                  // waits for a second
}

//read a string from the serial and store it in an array
//you must supply the array variable
void readSerialString (char *strArray) {
  int i = 0;
  if(Serial.available()) 
  {    
    while (Serial.available())
    {            
      strArray[i] = Serial.read();
      i++;
    }
  }      
}

//utility function to know wither an array is empty or not
boolean isStringEmpty(char *strArray) 
{
  if (strArray[0] == 0) 
  {
    return true;
  } 
  else 
  {
    return false;
  }
}

void readOneWireTemp() {
  byte i;
  byte present = 0;
  byte data[12];
  byte addr[8];

  if ( !ds.search(addr)) {
    Serial.print("No more addresses.\n");
    ds.reset_search();
    return;
  }

  Serial.print("R=");
  for( i = 0; i < 8; i++) {
    Serial.print(addr[i], HEX);
    Serial.print(" ");
  }

  if ( OneWire::crc8( addr, 7) != addr[7]) {
    Serial.print("CRC is not valid!\n");
    return;
  }

  if ( addr[0] != 0x10) {
    Serial.print("Device is not a DS18S20 family device.\n");
    return;
  }

  ds.reset();
  ds.select(addr);
  ds.write(0x44,1);         // start conversion, with parasite power on at the end

  delay(1000);     // maybe 750ms is enough, maybe not
  // we might do a ds.depower() here, but the reset will take care of it.

  present = ds.reset();
  ds.select(addr);    
  ds.write(0xBE);         // Read Scratchpad

  Serial.print("P=");
  Serial.print(present,HEX);
  Serial.print(" ");
  for ( i = 0; i < 9; i++) {           // we need 9 bytes
    data[i] = ds.read();
    Serial.print(data[i], HEX);
    Serial.print(" ");
  }
  Serial.print(" CRC=");
  Serial.print( OneWire::crc8( data, 8), HEX);
  Serial.println();

  LowByte = data[0];
  HighByte = data[1];
  TReading = (HighByte << 8) + LowByte;
  SignBit = TReading & 0x8000;  // test most sig bit
  if (SignBit) // negative
  {
    TReading = (TReading ^ 0xffff) + 1; // 2's comp
  }
  Tc_100 = (6 * TReading) + TReading / 4;    // multiply by (100 * 0.0625) or 6.25
  Tf_100 = (Tc_100 * 9/5) + 32;  // Convert to F

  Whole = Tf_100 / 100;  // separate off the whole and fractional portions
  Fract = Tf_100 % 100;

  if (SignBit) // If its negative
  {
    Serial.print("-");
  }
  Serial.print(Whole);
  Serial.print(".");
  if (Fract < 10)
  {
    Serial.print("0");
  }
  Serial.print(Fract);
  Serial.print("\n");
}