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/*
  Analog input, analog output, serial output
 
 Reads an analog input pin, maps the result to a range from 0 to 255
 and uses the result to set the pulsewidth modulation (PWM) of an output pin.
 Also prints the results to the serial monitor.
 
 The circuit:
 * potentiometer connected to analog pin 0.
   Center pin of the potentiometer goes to the analog pin.
   side pins of the potentiometer go to +5V and ground
 * LED connected from digital pin 9 to ground
 
 created 29 Dec. 2008
 by Tom Igoe

 Fruktansvärt modifierad av Andreas Grehn
 
 */

// These constants won't change.  They're used to give names
// to the pins used:
const int analogInPin = 0;  // Analog input pin that the potentiometer is attached to
const int analogOutPin = 9; // Analog output pin that the LED is attached to

const int redPin = 10;
const int greenPin = 11;
const int relayPin = 4;
const int relayLed = 5;

const float toHot = 27.5;      //Starttemperatur för fläkten
const float coldEnuf = 27.3;      //När denna nås stänger fläkten av

int sensorValue = 0;        // value read from the sensor
int sensorSampleCount = 50;
float sensorSamplesTotal = 0;

float sensorMVolt = 0;
float temperatureC = 0;

float bitVoltValue = 0;

boolean relayStatus = 0;

int incomingByte = 0;	// for incoming serial data

float tempMax = 0;
float tempMin = 999;
long int fanStarts = 0;

boolean on = 1;

void setup() {
  // initialize serial communications at 9600 bps:
  //analogReference(INTERNAL);
  Serial.begin(9600); 
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);  
  pinMode(relayPin, OUTPUT); 
  pinMode(relayLed, OUTPUT); 
}

void loop() {
  if (on) {
    for (int i=0; i < sensorSampleCount; i++) {
      //dessa tre rader behövs för att få korrekta värden från den interna 1.1v referensen
      //Varför har jag ingen aning om
      //Stulna från http://code.google.com/p/tinkerit/wiki/SecretVoltmeter
      ADMUX = _BV(REFS0) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
      delay(2); // Wait for Vref to settle
      ADCSRA |= _BV(ADSC); // Convert

      bitVoltValue = 1100.0/analogRead(14);
      delay(10);
      /*
      Serial.print(" 1.1V = ");
      Serial.print(bitVoltValue, DEC);
      */
      sensorValue = analogRead(analogInPin);
      delay(10);
      sensorSamplesTotal += (sensorValue*bitVoltValue); 
      //Serial.print(sensorSamplesTotal, DEC);
      //Serial.print("<-total current->");
      //Serial.println(sensorValue);
    }
    sensorValue = sensorSamplesTotal/sensorSampleCount;
    sensorSamplesTotal = 0;
    
    //sensorMVolt = sensorValue*4.9814; 
    sensorMVolt = sensorValue; 
    temperatureC = (sensorMVolt/10.0) - 273.1;
    
    /*
    Serial.print(" Sensor Nu = " );                       
    Serial.print(sensorValue);     
    Serial.print(" MVolt = ");
    Serial.print(sensorMVolt);
    */
    
    if (temperatureC < tempMin) { tempMin = temperatureC; }
    if (temperatureC > tempMax) { tempMax = temperatureC; }

    Serial.print("Temp current:");
    Serial.print(temperatureC);
    Serial.print(" max:");
    Serial.print(tempMax);
    Serial.print(" min:");
    Serial.print(tempMin);
    Serial.print(". Fanstarts:");
    Serial.println(fanStarts);
    

  // wait 10 milliseconds before the next loop
  // for the analog-to-digital converter to settle
  // after the last reading
    //delay(10);
    
    digitalWrite(redPin, LOW);
    digitalWrite(greenPin, HIGH);
    
    if (temperatureC >= toHot) {
      relayOn();
    }
    else if (temperatureC <= coldEnuf) {
      relayOff();
    }
  }
  else {
    analogWrite(analogOutPin, 0);  
    digitalWrite(greenPin, LOW);
    digitalWrite(redPin, HIGH);
    relayOff();
  }
  
  // send data only when you receive data:
  if (Serial.available() > 0) {
    // read the incoming byte:
    incomingByte = Serial.read();
      
    // say what you got:
    Serial.print("I received: ");
    Serial.println(incomingByte, DEC);
    if (incomingByte == 49) {
      //en etta "1"
      on = 1; 
      Serial.println("Turning on");
    }
    else if (incomingByte == 48) {
      //en tvåa "2"
      on = 0;
      Serial.println("Shutting down");
    }
    else if (incomingByte == 114) {
      //ett r "r"
      relaySwitch();
    }
  }
  
}

void relayOn() {
  if (relayStatus == false) {
    fanStarts++;
    relayStatus = true;
    digitalWrite(relayPin, HIGH);
    digitalWrite(relayLed, HIGH);
    //Serial.println("Relay turned ON");
  }
}

void relayOff() {
  if (relayStatus == true) {
    relayStatus = false;
    digitalWrite(relayPin, LOW);
    digitalWrite(relayLed, LOW);
    //Serial.println("Relay turned OFF");
  }
}

void relaySwitch() {
  if (relayStatus) {
    relayOff();
  } else {
    relayOn();
  }
}