/* Outside transmitter
 *  
 * 
 * 
 * Send data via RF 433MHz to receiver
 * 
 * CONNECTIONS
 * RF 433MHz: VCC -> 5V
              GND -> GND
              Data -> D12
 * Si7021:     VCC -> 5V
              GND -> GND
              SCL -> SCL
              SDA -> SDA
 
 */




#include <VirtualWire.h>
#include <Wire.h>
#include "SPI.h"   // Is it really neaded for BMP280 SPI?
#include "Adafruit_Si7021.h"





#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x3F,20,4);  // Replace 0x3F with your LCD's address
#include <Wire.h> 
#include <SPI.h>
#include <VirtualWire.h>

#include "RTClib.h"

RTC_DS3231 rtc;

#include "Adafruit_Si7021.h"

Adafruit_Si7021 sensor = Adafruit_Si7021();

//Constants
const int buttonPin = 5;   // for connection: https://www.arduino.cc/en/Tutorial/StateChangeDetection  
const int led = 13; //pin for LED     
const int LightResistor = A3;
const int minReading = 0;   // min value for light resistor
const int maxReading = 700;    // max value for light resistor

byte address = 0x00;    // for the potentiometer
int CS= 10;

char daysOfTheWeek[7][12] = {"Sun", "Mon", "Tue", "Wed", "Thur", "Fri", "Sat"};

//Variables
int buttonState1 = 0;
int buttonState2 = 0;
int flag = 1;
int Light = 0;
float tempIn = 0;
float humidIn = 0;
float heatindexIn = 0;
int16_t humidity_ = 0;     
int16_t temp_ = 0;
int16_t heat_index_ = 0;
float humidityOut = 0;
float tempOut = 0;
float heatindexOut = 0;
float tempInMax = 10;
float tempInMin = 50;
float tempOutMax = -20;
float tempOutMin = 50;
float humidInMax = -20;
float humidInMin = 100;
float humidityOutMax = -20;
float humidityOutMin = 100;
char MsgReceived[21];   // an array to store the data that need to be sent

// For state change:
// Variables will change:
int buttonPushCounter = 0;   // counter for the number of button presses
int buttonState = 0;         // current state of the button
int lastButtonState = 0;     // previous state of the button


void setup() {

  Serial.begin(9600);
   if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    while (1);
  }

  if (rtc.lostPower()) {
    Serial.println("RTC lost power, lets set the time!");
    // This line sets the RTC with an explicit date & time, for example to set
    // January 21, 2014 at 3am you would call:
   // rtc.adjust(DateTime(2016, 12, 8, 20, 20, 0));
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__))); // sets the RTC to the date & time this sketch was compiled
}
  
  
  lcd.init();                      // initialize the lcd 
  lcd.backlight();
  lcd.setBacklight(200);  // 0-255 http://playground.arduino.cc/Code/LCDAPI

  sensor.begin();   //Si7021
  
  //Input or output?
  pinMode(led, OUTPUT);      
  pinMode(buttonPin, INPUT); 

  pinMode (CS, OUTPUT);   // For the potentiometer
  SPI.begin();

// VirtualWire 
  // Bits per sec
  vw_setup(2000);
  // set pin for connect receiver module 
  vw_set_rx_pin(11);  
  // Start the receiver PLL running
  vw_rx_start(); 

}

void loop(){

  DateTime now = rtc.now();

   // RECEIVE VALUES from RF

  uint8_t buf[VW_MAX_MESSAGE_LEN];
  uint8_t buflen = VW_MAX_MESSAGE_LEN;
  //Taking the data from Outside
  if (vw_get_message(buf, &buflen)) 
  {
    digitalWrite(led, HIGH);
    delay(1000);
    digitalWrite(led, LOW);
    int i;
    // Message with a good checksum received, dump it. 
    for (i = 0; i < buflen; i++)
    {            
      // Fill Msg Char array with corresponding 
      // chars from buffer.   
      MsgReceived[i] = char(buf[i]);
   
    }
 
  
     sscanf(MsgReceived, "%d,%d",&humidity_, &temp_); // Converts a string to an array, %d: integer value

for (i = 0; i < buflen; i++)
{
  Serial.print(MsgReceived[i]);
}
  // Calculate Max/Mix outside values
  if (tempOutMax < tempOut) tempOutMax = tempOut;
  if (now.hour() == 0 & 0 <= now.minute() <= 5)  tempOutMax = -20;
  if (humidityOutMax < humidityOut) humidityOutMax = humidityOut;
  if (now.hour() == 0 & 0 <= now.minute() <= 5)  humidityOutMax = -20;
  if (tempOutMin > (float)temp_ / 100.0) tempOutMin = (float)temp_ / 100.0;
  if (now.hour() == 0 & 0 <= now.minute() <= 5)  tempOutMin = 50;
  if (humidityOutMin > (float)humidity_ / 100.0) humidityOutMin = (float)humidity_ / 100.0;
  if (now.hour() == 0 & 0 <= now.minute() <= 5)  humidityOutMin = 100;
  
  // Convert outside values to decimals
  humidityOut = (float)humidity_ / 100.0;
  tempOut = (float)temp_ / 100.0;
  heatindexOut = (float)heat_index_ / 100.0;

  }

 // Take Si7021 Readings
  float lasttemp = tempIn;
  tempIn = sensor.readTemperature();
  humidIn = sensor.readHumidity();

 // Calculate MAX/MIN Values for the day


  // Calculate Max/Mix outside values
  if (tempInMax < tempIn) tempInMax = tempIn;
  if (humidInMax < humidIn) humidInMax = humidIn;
  if (tempInMin > tempIn) tempInMin = tempIn;
  if (humidInMin > humidIn) humidInMin = humidIn;
 
  Serial.println(tempOutMax); 
  Serial.println(humidityOutMax);

  Serial.println(tempOutMin); 
  Serial.println(humidityOutMin);

  // Button State Change see: https://www.arduino.cc/en/Tutorial/StateChangeDetection
  buttonState = digitalRead(buttonPin);

  // compare the buttonState to its previous state
  if (buttonState != lastButtonState) {
    // if the state has changed, increment the counter
    if (buttonState == HIGH) {
      // if the current state is HIGH then the button
      // wend from off to on:
      flag++;
      lcd.init();
      if (flag == 4) {
    flag = 1;
    Serial.println(flag);
  }
     
    } else {
      // if the current state is LOW then the button
      // wend from on to off:
      Serial.println("No button press");
    }
    // Delay a little bit to avoid bouncing
    delay(50);
  }
  // save the current state as the last state,
  //for next time through the loop
  lastButtonState = buttonState;

  
  // LCD Menu choice
  
  switch (flag) {
  case 1:
  menu1(tempIn, humidIn, tempOut, humidityOut);
  break;  
  case 2:
  menu2(tempInMax, tempInMin, humidInMax, humidInMin);
  break;
  case 3:
  menu3 (tempOutMax, tempOutMin, humidityOutMax, humidityOutMin);
  break;
    }
 

  // Re-initialise LCD every 3 minutes to avoid strange time numbers
  unsigned long startTime = 0;
  unsigned long interval = 180000;    //3 mins
}

void menu1(float tIn, float hIn, float tOut, float hOut) { 
  DateTime now = rtc.now();
  lcd.setCursor(0,0);
  lcd.print(daysOfTheWeek[now.dayOfTheWeek()]); 
  lcd.setCursor(4,0);
  lcd.print(now.day(), DEC);
  lcd.print('/');
  lcd.print(now.month(), DEC);
  lcd.print('/');
  lcd.print(now.year(), DEC);    
  if (now.hour()<10) {
    lcd.setCursor(15,0);
    lcd.print("0");
    lcd.setCursor(16,0);
    lcd.print(now.hour(), DEC);
  }
  if (now.hour()>=10) {
    lcd.setCursor(15,0);
    lcd.print(now.hour(), DEC);
  }    
  lcd.setCursor(17,0);
  lcd.print(':');
  if (now.minute()<10) {
    lcd.setCursor(18,0);
    lcd.print("0");
    lcd.setCursor(19,0);
    lcd.print(now.minute(), DEC);
  }
  if (now.minute()>=10) {
    lcd.setCursor(18,0);
    lcd.print(now.minute(), DEC);
  }    
  lcd.setCursor(6,1);
  lcd.print("TEMP   HUMI");
  lcd.setCursor(0,2);
  lcd.print("IN :");
  lcd.setCursor(0,3);
  lcd.print("OUT:");
  lcd.setCursor(10,2);
  lcd.print("C");
  lcd.setCursor(10,3);
  lcd.print("C");
  lcd.setCursor(17,2);
  lcd.print("%");
  lcd.setCursor(17,3);
  lcd.print("%");
  lcd.setCursor(5,2);
  lcd.print(tIn,2);     // two decimal places
  lcd.setCursor(12,2);
  lcd.print(hIn,2);
  lcd.setCursor(5,3);
  lcd.print(tOut);
  lcd.setCursor(12,3);
  lcd.print(hOut);
  return(tIn,hIn,tOut,hOut);
  delay(3000);
}

void menu2(float tInMax, float tInMin, float hInMax, float hInMin) { 
  DateTime now = rtc.now();
  lcd.setCursor(0,0);
  lcd.print(daysOfTheWeek[now.dayOfTheWeek()]); 
  lcd.setCursor(4,0);
  lcd.print(now.day(), DEC);
  lcd.print('/');
  lcd.print(now.month(), DEC);
  lcd.print('/');
  lcd.print(now.year(), DEC);    
  //lcd.setCursor(15,0);
  //lcd.print(now.hour(), DEC);
  if (now.hour()<10) {
    lcd.setCursor(15,0);
    lcd.print("0");
    lcd.setCursor(16,0);
    lcd.print(now.hour(), DEC);
  }
  if (now.hour()>=10) {
    lcd.setCursor(15,0);
    lcd.print(now.hour(), DEC);
  }    
  lcd.setCursor(17,0);
  lcd.print(':');
  if (now.minute()<10) {
    lcd.setCursor(18,0);
    lcd.print("0");
    lcd.setCursor(19,0);
    lcd.print(now.minute(), DEC);
  }
  if (now.minute()>=10) {
    lcd.setCursor(18,0);
    lcd.print(now.minute(), DEC);
  }    
  lcd.setCursor(1,1);
  lcd.print("ROOM  MAX    MIN");
  lcd.setCursor(0,2);
  lcd.print("Temp: ");
  lcd.setCursor(0,3);
  lcd.print("Humi: ");
  lcd.setCursor(6,2);
  lcd.print(tInMax,2);
  lcd.setCursor(13,2);
  lcd.print(tInMin,2);
  lcd.setCursor(6,3);
  lcd.print(hInMax,2);
  lcd.setCursor(13,3);
  lcd.print(hInMin,2);
  return (tInMax,tInMin,hInMax,hInMin);
  delay(3000);
}

void menu3 (float tOutMax, float tOutMin, float hOutMax, float hOutMin){
DateTime now = rtc.now(); 
  lcd.setCursor(0,0);
  lcd.print(daysOfTheWeek[now.dayOfTheWeek()]); 
  lcd.setCursor(4,0);
  lcd.print(now.day(), DEC);
  lcd.print('/');
  lcd.print(now.month(), DEC);
  lcd.print('/');
  lcd.print(now.year(), DEC);    
  if (now.hour()<10) {
    lcd.setCursor(15,0);
    lcd.print("0");
    lcd.setCursor(16,0);
    lcd.print(now.hour(), DEC);
  }
  if (now.hour()>=10) {
    lcd.setCursor(15,0);
    lcd.print(now.hour(), DEC);
  }    
  lcd.setCursor(17,0);
  lcd.print(':');
  if (now.minute()<10) {
    lcd.setCursor(18,0);
    lcd.print("0");
    lcd.setCursor(19,0);
    lcd.print(now.minute(), DEC);
  }
  if (now.minute()>=10) {
    lcd.setCursor(18,0);
    lcd.print(now.minute(), DEC);
  }    
  lcd.setCursor(1,1);
  lcd.print("OUT   MAX    MIN");
  lcd.setCursor(0,2);
  lcd.print("Temp: ");
  lcd.setCursor(0,3);
  lcd.print("Humi: ");
  lcd.setCursor(6,2);
  lcd.print(tOutMax,2);
  lcd.setCursor(13,2);
  lcd.print(tOutMin,2);
  lcd.setCursor(6,3);
  lcd.print(hOutMax,2);
  lcd.setCursor(13,3);
  lcd.print(hOutMin,2);
  return (tOutMax,tOutMin,hOutMax,hOutMin);
  delay(3000); 
}

void MaxValue (float Value, float MaxValue) {
  DateTime now = rtc.now();
    if (Value>MaxValue) MaxValue = Value;

 if (now.hour() == 0 & now.minute() == 0)  MaxValue = -20;
 return (Value, MaxValue);
}

void MinValue (float Value, float MinValue) {
  DateTime now = rtc.now();
   if (Value<MinValue) MinValue == Value;
 if (now.hour() == 0 & now.minute() == 0)  MinValue = 100;
 return (Value, MinValue);
}