//DHT 22
#include "DHT.h"
#define DHTPIN 12
#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
float temperature;
float humidity;
DHT dht(DHTPIN, DHTTYPE);

unsigned long currentMillis;
unsigned long previousMillisDHT22 = 0;
const unsigned long periodDHT22 = 2500;
unsigned long previousMillisRelay = 0;   //previousmillis=0

unsigned long relayOffTime = 2000;          //onTime
unsigned long relayOnTime =1000;            //offTime

int setTemp=30;
int setHum=60;

int offTime=30;
int onTime=1;
//int offTimeMin=0;
//int onTimeMin=0;
int offTimeRelay=0;
int onTimeRelay=0;
int intervalRelay = relayOnTime; //int interval=onTime


#include <LiquidCrystal.h>

LiquidCrystal lcd(2, 3, 4, 5, 6, 7); //Arduino pins to lcd pins (RS,E,D4,D5,D6,D7)

//Counters to change positions of pages and sub-menus

int page_counter=1 ;       //To move beetwen pages
int subpage_counter=0;    //To move submenu 1 RGB
int subpage2_counter=0;   //To move submenu 2 Led


//-------Pins-----//
int up = 8;               //Up/Yes button 
int sel = 14;             //Select button
int down = 10;           //Down/No button

int relay = 13;            //relay

//---------Storage states of buttons for debounce function-----//
boolean current_up = LOW;          
boolean last_up=LOW;            
boolean current_sel = LOW;
boolean last_sel = LOW;
boolean last_down = LOW;
boolean current_down = LOW;

//--------Relay states-----------//
boolean relay_state = true;   //boolean led state=true



//Custom return char
byte back[8] = {
  0b00100,
  0b01000,
  0b11111,
  0b01001,
  0b00101,
  0b00001,
  0b00001,
  0b11111
};

//Custom arrow char
byte arrow[8] = {
  0b01000,
  0b00100,
  0b00010,
  0b11111,
  0b00010,
  0b00100,
  0b01000,
  0b00000
};

void setup() {
  // Declare pin modes
  pinMode(relay, OUTPUT);
   
  lcd.begin(16,2);
  lcd.print("System "); 
  lcd.setCursor(1, 1);
  lcd.print("    loading...");
  lcd.blink();
  delay(1000);
  lcd.noBlink();
  lcd.clear();
  lcd.createChar(1, back);
  lcd.createChar(2, arrow);
  dht.begin();  
}


   //---- De-bouncing function for all buttons----//
boolean debounce(boolean last, int pin){
       boolean current = digitalRead(pin);
       if (last != current){
       delay(20);
       current = digitalRead(pin);
       }
      return current;
}


void loop() {

  currentMillis = millis();
  if (currentMillis - previousMillisDHT22 >= periodDHT22) {
    temperature = dht.readTemperature();
    humidity = dht.readHumidity();
    previousMillisDHT22 = currentMillis;
  }

  // Check if any reads failed and exit early (to try again).
  if (isnan(temperature) || isnan(humidity)) {
    lcd.println(F("Failed to read from DHT sensor!"));
    return;
  }

current_up = debounce(last_up, up);         //Debounce for Up button
current_sel = debounce(last_sel, sel);      //Debounce for Select  button
current_down = debounce(last_down, down);   //Debounce for Down button

//----Page counter function to move pages----//

if(subpage_counter==0 && subpage2_counter==0){                 // up/down buttons enabled if subcounters are 0,Disabled if 1,2..etc to work on submenus
  
//Page Up
    if (last_up== LOW && current_up == HIGH){ //Up button pressed
      lcd.clear();                            //Clear lcd if page is changed to print new one
      if(page_counter <4){              //Page counter never higher than 3(total of pages)
      page_counter= page_counter +1;   //Page up
      
      }
      else{
      page_counter= 1;                 //If higher than 3 (last page) stay on page 3(change to 1 if you want to rotate)
      }
  
}
 
last_up = current_up;                 //Save up button last state 

//Page Down
    if (last_down== LOW && current_down == HIGH){//Down button pressed
      lcd.clear();                       //Clear lcd if page is changed to print new one
      if(page_counter >1){              //Page counter never lower than 1 (total of pages)
      page_counter= page_counter -1;   //Page down
      
      }
      else{
      page_counter= 4;                 //If lower than 1(first page) stay on page 1(change to 3 if you want to rotate)
      }
  }
    
    last_down = current_down;         //Save down button last state
}

//------- Switch function to write and show what you want---// 
  switch (page_counter) {
   
    case 1:{     //Design of home page 1
      lcd.setCursor(0, 0);
      lcd.print("Hum.: ");
      lcd.print(humidity,1);
      lcd.print(" ");
      lcd.setCursor(13,0); 
      lcd.print("%");
      lcd.setCursor(0,1);
      lcd.print("Temp.:");
      lcd.print(temperature,1);
      lcd.print(" ");
      lcd.setCursor(12,1);
      lcd.print(char(223)); lcd.print("C");

    }//case1 end
    break;

    case 2: { //Design of page 2 RGB control
      const unsigned long periodset1 = 2000;
   //Static objects 
     lcd.setCursor(4,0); 
     lcd.print("Settings");
     lcd.setCursor(1,1);
     lcd.print("Hu<");
     lcd.setCursor(9,1);
     lcd.print("Te>");
     lcd.setCursor(15,1);
     lcd.write(byte(1));     //Return custom char
      
     //FUNCTIONS
     
     // Sub counter control
     if (last_sel== LOW && current_sel == HIGH){ //select button pressed
      if(subpage_counter <3){                    // subpage counter never higher than 4 (total of items)
     subpage_counter ++;                         //subcounter to move beetwen submenu
     }
     else{                                       //If subpage higher than 4 (total of items) return to first item
      subpage_counter=1;
     }
     }
     last_sel=current_sel;                      //Save last state of select button
     
     //First item control(subpage_counter =1) red led
     if(subpage_counter==1){
     lcd.setCursor(14,1);
     lcd.print(" ");                           //Delete last arrow position              
     lcd.setCursor(0,1);
     lcd.write(byte(2));

     if (last_up== LOW && current_up == HIGH){  //Up, red led on
     setHum=setHum+5;
     }
     last_up=current_up;
     
     if(last_down== LOW && current_down == HIGH){//Down, red led off
     setHum=setHum-5;
     }
     last_down=current_down;
     }

     if (setHum<0){
         setHum=100;
      }
     if (setHum>100){
       setHum=0;
     }
      if (setHum<10&&setHum>=0) {      
       lcd.setCursor(5,1);
      lcd.print("  ");
      }
      if (setHum>100||setHum<100&&setHum>10){
          lcd.setCursor(6,1);
          lcd.print(" ");
      }
        
     lcd.setCursor(4,1);
     lcd.print(setHum);
     lcd.print(" ");
     
      

     //Second item control (subpage_counter=2) green led
     if(subpage_counter==2){
     lcd.setCursor(0,1);
     lcd.print(" ");                           //Delete last arrow position                    
     lcd.setCursor(8,1);                      //Place the arrow
     lcd.write(byte(2));   

     if (last_up== LOW && current_up == HIGH){ 
    // green_state=HIGH;
     setTemp=++setTemp;
     }
     last_up=current_up;
     
     if(last_down== LOW && current_down == HIGH){
    // green_state=LOW; 
     setTemp=--setTemp;
     }
     last_down=current_down;
     }

    if (setTemp<4){
      setTemp=40;
    }
    if (setTemp>40){
      setTemp=4; 
    }
    if (setTemp<10){
      lcd.setCursor(13,1);
      lcd.print(" ");
     }
   }
     lcd.setCursor(12,1);
     lcd.print(setTemp); 

     //Fourth item control (subpage_counter=4) Back
     if(subpage_counter==3){
     lcd.setCursor(8,1);
     lcd.print(" ");                           //Delete last arrow position                    
     lcd.setCursor(14,1);                      //Place the arrow
     lcd.write(byte(2));                      
     if (last_up== LOW && current_up == HIGH){ //Yes button pressed
     lcd.setCursor(14,1);
     lcd.print(" ");                            //Delete arrow 
     subpage_counter=0;                         //if sub page 0, exit sub menu, up/down pages enabled
     }
     last_up=current_up;
     
     if(last_down== LOW && current_down == HIGH){//No button pressed
     subpage_counter=1;                          //Stay on sub menu, return to R
     }
     last_down=current_down;
     }
    //case2 end
    break;

    case 3: {   //Page 3
     lcd.setCursor(0,0);
     lcd.print("Set op.time:");
     lcd.setCursor(1,1);
     lcd.print("On:");
     lcd.setCursor(8,1);
     lcd.print("Off:");     
     lcd.setCursor(15,1);
     lcd.write(byte(1));     //Return custom char   

    // Sub counter control
     if (last_sel== LOW && current_sel == HIGH){ //select button pressed
      if(subpage_counter <3){                    // subpage counter never higher than 4 (total of items)
     subpage_counter ++;                         //subcounter to move beetwen submenu
     }
     else{                                       //If subpage higher than 4 (total of items) return to first item
      subpage_counter=1;
     }
     }
     last_sel=current_sel;                      //Save last state of select button
     
     //First item control(subpage_counter =1) red led
     if(subpage_counter==1){
     lcd.setCursor(14,1);
     lcd.print(" ");                           //Delete last arrow position              
     lcd.setCursor(0,1);
     lcd.write(byte(2));

  
     if (last_up== LOW && current_up == HIGH){  //Up, red led on
     onTime=++onTime;
     }
     last_up=current_up;
     
     
     if(last_down== LOW && current_down == HIGH){//Down, red led off
     onTime=--onTime;
     
     }
     last_down=current_down;
     }
        
      if (onTime>60 ){
      onTime=60;
    }
    if (onTime<0 ){
      onTime=0;
    }
    if (onTime<10 ){
      lcd.setCursor(5,1);
      lcd.print(" ");
    }
    lcd.setCursor(4,1);
    lcd.print(onTime); 



    //Second item control(subpage_counter =2)
     if(subpage_counter==2){
     lcd.setCursor(0,1);
     lcd.print(" ");                           //Delete last arrow position              
     lcd.setCursor(7,1);
     lcd.write(byte(2));

     if (last_up== LOW && current_up == HIGH){  //Up, red led on
     offTime=++offTime;
     //lcd.setCursor(12,1);
     //lcd.print(offTime);
     }
     last_up=current_up;
     
     if(last_down== LOW && current_down == HIGH){//Down, red led off
     offTime=--offTime;
     
     }
     last_down=current_down;
     
     if (offTime>180 ){
      offTime=180;
     }
     
    }
     if (offTime<0 ){
      offTime=0;
    }
    if (offTime<10 ){
      lcd.setCursor(13,1);
      lcd.print(" ");
    }
     lcd.setCursor(12,1);
    lcd.print(offTime); 
    
    //Third item control (subpage_counter=3) Back
     if(subpage_counter==3){
     lcd.setCursor(7,1);
     lcd.print(" ");                           //Delete last arrow position                    
     lcd.setCursor(14,1);                      //Place the arrow
     lcd.write(byte(2));  

     if (last_up== LOW && current_up == HIGH){ //Yes button pressed
     lcd.setCursor(14,1);
     lcd.print(" ");                            //Delete arrow 
     subpage_counter=0;                         //if sub page 0, exit sub menu, up/down pages enabled
     }
     last_up=current_up;
     
     if(last_down== LOW && current_down == HIGH){//No button pressed
     subpage_counter=0;                          //Stay on sub menu, return to R
     }
     last_down=current_down;
     }     
     
    }//case3 end
    break;

    case 4: {
      lcd.home();
      lcd.setCursor(1,0);
      lcd.print("Manual control");
      lcd.setCursor(1,1);
      lcd.print("Relay:");
      lcd.setCursor(15,1);
     lcd.write(byte(1));     //Return custom char   

    // Sub counter control
     if (last_sel== LOW && current_sel == HIGH){ //select button pressed
      if(subpage_counter <3){                    // subpage counter never higher than 4 (total of items)
     subpage_counter ++;                         //subcounter to move beetwen submenu
     }
     else{                                       //If subpage higher than 4 (total of items) return to first item
      subpage_counter=1;
     }
     }
     last_sel=current_sel;                      //Save last state of select button
     
     //First item control(subpage_counter =1) red led
     if(subpage_counter==1){
     lcd.setCursor(14,1);
     lcd.print(" ");                           //Delete last arrow position              
     lcd.setCursor(0,1);
     lcd.write(byte(2));

    
    if (last_up== LOW && current_up == HIGH){  //Up, red led on
     relay_state=HIGH;
     }
     last_up=current_up;
       
     if(last_down== LOW && current_down == HIGH){//Down, red led off
     relay_state=LOW;
     }
     last_down=current_down;
     
     if (relay_state==HIGH){
      lcd.setCursor(7,1);
     lcd.print("ON "); 
    }
    if (relay_state==LOW){
      lcd.setCursor(7,1);
     lcd.print("OFF"); 
    }
   
     
    }

    


       if(subpage_counter==2){
     lcd.setCursor(0,1);
     lcd.print(" ");                           //Delete last arrow position                    
     lcd.setCursor(14,1);                      //Place the arrow
     lcd.write(byte(2));  

     if (last_up== LOW && current_up == HIGH){ //Yes button pressed
     lcd.setCursor(14,1);
     lcd.print(" ");                            //Delete arrow 
     subpage_counter=0;                         //if sub page 0, exit sub menu, up/down pages enabled
     }
     last_up=current_up;
     
     if(last_down== LOW && current_down == HIGH){//No button pressed
     subpage_counter=0;                          //Stay on sub menu, return to R
     }
     last_down=current_down;
     }
     
     }//case 4 end
    break;
  }//switch end

 // Realy timing

  digitalWrite(relay, relay_state);
  
  if (setHum>humidity && setTemp<temperature){
      
   // Compare to previous capture to see if enough time has passed
   if ((unsigned long)(currentMillis - previousMillisRelay) >= intervalRelay) {
      // Change wait interval, based on current LED state
      if (relay_state) {
         // LED is currently on, set time to stay off
         intervalRelay = relayOffTime;
      } else {
         // LED is currently off, set time to stay on
         intervalRelay = relayOnTime;
      }
      // Toggle the LED's state, Fancy, eh!?
      relay_state = !(relay_state);

      // Save the current time to compare "later"
      previousMillisRelay = currentMillis;
   }
  } //end of relay timing
   
}//loop end