/*
Program for handling the serial programming
This version uses standard serial library
*/

#include <DHTStable.h>

#define relayPin 0 // Connected to the third pin, just next to power and to button

#define DHTPIN 4  // DHT sensor pin
#define DHTTYPE DHT22   // DHT 22  (AM2302)

#define RELAY_ON 1      // Define relay on pin state
#define RELAY_OFF 0     // Define relay off pin state


const char node = '1'; // network address

const int ledPin = 1; // the number of the LED pin (default 1)

int incomingByte;

int state = LOW;

// Initialize the humidity and temperature variables
DHTStable DHT; // initialize the DHT library
int temperature;
int humidity;
int intchk;

unsigned long lastTime = 0;

void setup() {

  // Turn relay off and set pinMode Output
  digitalWrite(relayPin, RELAY_OFF);      // initialise the relay to off
  pinMode(relayPin, OUTPUT);   
  Serial.swap(1);
  Serial.begin(9600);
  
  pinMode(ledPin, OUTPUT);
 
  pinMode(DHTPIN, INPUT);
 
  digitalWrite(ledPin,LOW);
  // Read initial humn and temp values
   // temp = DHT.getTemperature();
   // hum = DHT.getHumidity();

}

void loop() {
  //delay(2000);
  //intchk = DHT.read22(DHTPIN);
   //temperature  = DHT.getTemperature();
  //humidity = DHT.getHumidity();
 if (Serial.available() > 0) {
    incomingByte = Serial.read();


/* Command reference for UI_Node1
 *  1: Return node is alive message.
 *  a: Turn off led
 *  A: Turn On led
 *  h: return humidity value
 *  t: return temperature value
 *  r: turn relay off
 * R: turn relay off
*/

switch(incomingByte)
{

#ifdef DEBUG
    case '1':  
      Serial.print("Node ");
      Serial.flush();
      Serial.print(node);
      Serial.flush();
      Serial.println(" is alive.");
      Serial.flush(); 
      break;
#endif   
     
    case 'a':
      digitalWrite(ledPin,LOW);
#ifdef DEBUG
      Serial.println("Led off");
      Serial.flush();
#endif
          break;
    
    case 'A':
    digitalWrite(ledPin,HIGH);
    
#ifdef DEBUG
   Serial.println("Led on");
    Serial.flush();
#endif
    break;
    
    case 'R':
    digitalWrite(relayPin, RELAY_ON);
#ifdef DEBUG    
    Serial.println("Relay on");
    Serial.flush();
#endif
    break;
    
    case 'r':
    digitalWrite(relayPin, RELAY_OFF);
#ifdef DEBUG
    Serial.println("Relay off");
    Serial.flush();
#endif
    break;
    
    case 't':
    intchk = DHT.read22(DHTPIN);
    delay(3000);
    temperature  = DHT.getTemperature();
    Serial.print("Temperature: ");
    Serial.println(temperature);
    Serial.flush();
    break;

    case 'h':
    intchk = DHT.read22(DHTPIN);
    delay(3000);
    humidity  = DHT.getHumidity();
    Serial.print("Humidity: ");
    Serial.println(humidity);
    Serial.flush();
    break;
    
    // status query


 #ifdef DEBUG

    case 's':
  switch (intchk)
    {
    case DHTLIB_OK:
        Serial.println("Read Status OK");
        Serial.flush();
        break;
    case DHTLIB_ERROR_CHECKSUM:
        Serial.println("Checksum error");
        Serial.flush();
        break;
    case DHTLIB_ERROR_TIMEOUT:
        Serial.println("Time out error");
        Serial.flush();
        break;
    default:
        Serial.println("Unknown error");
        Serial.flush();
        break;
         
    }
    
    break;
 #endif  
    default:
     break;
      }
   }

}