#include <OneWire.h>
#include <DallasTemperature.h>
#include <RunningMedian.h>
#include <RCSwitch.h>

// Data wire is conntec to the Arduino digital pin 4
#define ONE_WIRE_BUS 4

// Setup a oneWire instance to communicate with any OneWire devices
OneWire oneWire(ONE_WIRE_BUS);

// Pass our oneWire reference to Dallas Temperature sensor 
DallasTemperature sensors(&oneWire);

RunningMedian samples = RunningMedian(100);

// Get starting time
unsigned long previousTime1;
unsigned long previousTime2;
unsigned long currentMillis;
const unsigned long periodShort = 1000;
const unsigned long periodLong = 5000;
float previousMedianTemp;
float currentMedianTemp;
float DeltaMedianTemp;
float ChangeT;
int DeltaMillis;

// LED Setup
#define LED_PIN 12

// RC 433 Setup
RCSwitch RCsender = RCSwitch();


void setup(void){
  // Start serial communication for debugging purposes
  Serial.begin(9600);
  // Start up the library
  sensors.begin();

  // Set intial timers
  previousTime1 = millis();  //initial start time
  previousTime2 = millis();  //initial start time
  
  //LED Setup
  pinMode(LED_PIN, OUTPUT);
  digitalWrite(LED_PIN, LOW);

  // RC Setup (https://daniel-ziegler.com/arduino/mikrocontroller/2017/06/16/Funksteckdose-arduino/)
  RCsender.enableTransmit(3);  // An Pin 3
  RCsender.setProtocol(1);
  RCsender.setPulseLength(187);

  //Get starting temperature
  sensors.requestTemperatures(); 
  previousMedianTemp = sensors.getTempCByIndex(0);

}

void loop(void){ 
  sensors.requestTemperatures(); 

  samples.add(sensors.getTempCByIndex(0));
  currentMedianTemp = samples.getMedian();

  currentMillis = millis();


  if(currentMillis - previousTime1 >= periodShort){
    Serial.print("Celsius temperature: ");
    // Why "byIndex"? You can have more than one IC on the same bus. 0 refers to the first IC on the wire
    Serial.print(sensors.getTempCByIndex(0));
    Serial.print(" / ");
    Serial.println(currentMedianTemp); 
    previousTime1 = millis();

  }

  DeltaMillis = currentMillis - previousTime2;

  if(DeltaMillis >= periodLong){
    // Calculate difference in T between this and previous LONG period
    DeltaMedianTemp = currentMedianTemp-previousMedianTemp;

     // Calculate change in T between this and previous LONG period in °C per min
    ChangeT = (DeltaMedianTemp/(DeltaMillis/1000)*60);

    // Print output
    Serial.print(" - time: ");
    Serial.println(DeltaMillis);
    Serial.print(" - Median Temp: ");
    Serial.println(currentMedianTemp);
    Serial.print(" - Temp-diff: ");
    Serial.println(DeltaMedianTemp);
    Serial.print(" - Temp-change: ");
    Serial.println(ChangeT);
    previousMedianTemp = currentMedianTemp;
    previousTime2 = millis();

    // Control LEDs
    if(ChangeT<=20 & currentMedianTemp<=30){
      digitalWrite(LED_PIN, HIGH);
      RCsender.sendTriState("FFF0FFF10001");
    }
    else{
      digitalWrite(LED_PIN, LOW);
      RCsender.sendTriState("FFF0FFF100010");

    }
  }
  //delay(50);

}