//-------------------------------------- LCD --------------------------------------
// include the library code:
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
// initialize the library by associating any needed LCD interface pin
// with the arduino pin number it is connected to
// Initialize the library with the I2C address (usually 0x27 or 0x3F)
LiquidCrystal_I2C lcd(0x27, 20, 4);  // 20 columns and 4 rows
//-------------------------------------- VOLTAGE SENSORS --------------------------------------
const int Solar_Sen_Pin = A0;
const int Grid_Sen_Pin = A1;
const int Battery_Sen_Pin = A2;
int Solar_Val;
int Grid_Val;
int Battery_Val;
float Solar_Volts;
float Grid_Volts;
float Battery_Volts;
//-------------------------------------- RELAYS --------------------------------------
const int Relay_Solar = 23;
const int Relay_Grid = 25;
const int Relay_Gnd = 27;
const int Relay_Battery = 29;
const int Relay_BatteryN = 31;
const int Relay_High = 33;
const int Relay_Normal = 35;
const int Relay_Low = 37;
//-------------------------------------- BUTTONS --------------------------------------
const int Button_PH = 2;
const int Button_B40 = 3;
int  ButtonState_PH;
int  ButtonState_B40;
//-------------------------------------- BLUETOOTH --------------------------------------
char Blue_Val = 0;                //Variable for storing Incoming_value
void setup()
{
  Serial.begin(9600); // Initialize serial communications
//-------------------------------------- LCD --------------------------------------
  lcd.init();     // Initialize the LCD
  lcd.backlight(); // Turn on the backlight
  lcd.clear();    // Clear the LCD
  // set the cursor position:
  lcd.setCursor(0,0);
  // Print a message to the LCD.
  lcd.print("SMART HYBRID");
  // set the cursor position:
  lcd.setCursor(0,1);
  // Print a message to the LCD.
  lcd.print("ENERGY MANAGEMENT");
  // set the cursor position:
  lcd.setCursor(0,2);
  // Print a message to the LCD.
  lcd.print("SYSTEM USING");
  // set the cursor position:
  lcd.setCursor(0,3);
  // Print a message to the LCD.
  lcd.print("ARDUINO");
  delay(5000);
  lcd.clear();
  lcd.setCursor(0,0);
  // Print a message to the LCD.
  lcd.print("DESIGNED BY:");
  lcd.setCursor(0,1);
  // Print a message to the LCD.
  lcd.print("NIKHIL TP");
  // set the cursor position:
  lcd.setCursor(0,2);
  // Print a message to the LCD.
  lcd.print("AND");
  // set the cursor position:
  lcd.setCursor(0,3);
  // Print a message to the LCD.
  lcd.print("VISHNU PAVITHRAN K");
  delay(5000);
  lcd.clear(); 
//-------------------------------------- VOLTAGE SENSORS --------------------------------------
  pinMode(Solar_Sen_Pin,INPUT);
  pinMode(Grid_Sen_Pin,INPUT);
  pinMode(Battery_Sen_Pin,INPUT);
  //-------------------------------------- RELAYS --------------------------------------
  pinMode(Relay_Solar,OUTPUT);
  pinMode(Relay_Grid,OUTPUT);
  pinMode(Relay_Gnd,OUTPUT);
  pinMode(Relay_Battery,OUTPUT);
  pinMode(Relay_BatteryN,OUTPUT);
  pinMode(Relay_High,OUTPUT);
  pinMode(Relay_Normal,OUTPUT);
  pinMode(Relay_Low,OUTPUT);
  //initially Turn Off the Relays
  digitalWrite(Relay_Solar, LOW);
  digitalWrite(Relay_Grid, LOW);
  digitalWrite(Relay_Gnd, LOW);
  digitalWrite(Relay_Battery, LOW);
  digitalWrite(Relay_BatteryN, LOW);
  digitalWrite(Relay_High, LOW);
  digitalWrite(Relay_Normal, LOW);
  digitalWrite(Relay_Low, LOW);
//-------------------------------------- BUTTONS --------------------------------------
  pinMode(Button_PH,INPUT_PULLUP);
  pinMode(Button_B40,INPUT_PULLUP);
//-------------------------------------- BLUETOOTH --------------------------------------
  Serial1.begin(9600); 
}
void loop() 
{
//-------------------------------------- BLUETOOTH --------------------------------------
  if(Serial1.available() > 0)  
  {
    Blue_Val = Serial1.read();      //Read the incoming data and store it into variable Incoming_value
    Serial.println(Blue_Val);        //Print Value of Incoming_value in Serial monitor
  }
//-------------------------------------- VOLTAGE SENSORS --------------------------------------
//--------------- Solar Voltage --------------
  // read the input on analog pin:
  Solar_Val = analogRead(Solar_Sen_Pin);
  // Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V):
  Solar_Volts = (Solar_Val * 5.0) / 1023.0;
  // print out the value you read:
  Serial.print("Solar_Volts = ");
  Serial.print(Solar_Volts);
//  lcd.setCursor(0,0);
//  // Print a message to the LCD.
//  lcd.print("Solar = ");
//  lcd.print(Solar_Volts);
//  lcd.print("V        ");
//--------------- Grid Voltage --------------
  // read the input on analog pin:
  Grid_Val = analogRead(Grid_Sen_Pin);
  // Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V):
  Grid_Volts = (Grid_Val * 5.0) / 1023.0;
  // print out the value you read:
  Serial.print("    Grid_Volts = ");
  Serial.print(Grid_Volts);
//  lcd.setCursor(0,3);
//  // Print a message to the LCD.
//  lcd.print("Grid = ");
//  lcd.print(Grid_Volts);
//  lcd.print("V        ");
//--------------- Battery Voltage --------------
  // read the input on analog pin:
  Battery_Val = analogRead(Battery_Sen_Pin);
  // Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V):
  Battery_Volts = (Battery_Val * 5.0) / 1023.0;
  // print out the value you read:
  Serial.print("    Battery_Volts = ");
  Serial.println(Battery_Volts);
//  lcd.setCursor(0,2);
//  // Print a message to the LCD.
//  lcd.print("Battery = ");
//  lcd.print(Battery_Volts);
//  lcd.print("V        ");
//-------------------------------------- BUTTONS --------------------------------------
  // read the state of the pushbutton value:
  ButtonState_PH = digitalRead(Button_PH);
  ButtonState_B40 = digitalRead(Button_B40);
//-------------------------------------- CONDITIONS --------------------------------------
//------------------------------------------------------------------
//---------------- SOLAR ON, GRID ON, BATTERY ON -------------------
//------------------------------------------------------------------
  if(Solar_Volts >= 2 && Grid_Volts >= 2 && Battery_Volts >= 2)
  {
    lcd.setCursor(0,0);
    lcd.print("SYSTEM: SOLAR         "); 
    lcd.setCursor(0,1);
    lcd.print("S: ON G: ON B: ON      ");
    lcd.setCursor(0,2);
    lcd.print("                              ");   
    //OFF The Grid and Battery System
    digitalWrite(Relay_Grid, LOW);
    digitalWrite(Relay_Battery, LOW);
    digitalWrite(Relay_BatteryN, LOW);
    //ON The Solar System
    digitalWrite(Relay_Solar, HIGH);
    digitalWrite(Relay_Gnd, HIGH); 
    if(Blue_Val == '1')
    {
      digitalWrite(Relay_High, HIGH);
    }
    else if(Blue_Val == '2')
    {
      digitalWrite(Relay_Normal, HIGH);
    }
    else if(Blue_Val == '3')
    {
      digitalWrite(Relay_Low, HIGH);
    }
    else if(Blue_Val == '9')
    {
      digitalWrite(Relay_High, HIGH);
      digitalWrite(Relay_Normal, HIGH);
      digitalWrite(Relay_Low, HIGH);
    }
    else if(Blue_Val == 'I')
    {
      digitalWrite(Relay_High, LOW);
      digitalWrite(Relay_Normal, LOW);
      digitalWrite(Relay_Low, LOW);
    }
    else
    {
      digitalWrite(Relay_High, HIGH);
      digitalWrite(Relay_Normal, HIGH);
      digitalWrite(Relay_Low, HIGH);
    }
  }
//------------------------------------------------------------------
//---------------- SOLAR ON, GRID ON, BATTERY OFF -------------------
//------------------------------------------------------------------
  if(Solar_Volts >= 2 && Grid_Volts >= 2 && Battery_Volts < 2)
  {
    lcd.setCursor(0,0);
    lcd.print("SYSTEM: SOLAR         ");
    lcd.setCursor(0,1);
    lcd.print("S: ON G: ON B: OFF      ");
    lcd.setCursor(0,2);
    lcd.print("                              ");
    //OFF The Grid and Battery System
    digitalWrite(Relay_Grid, LOW);
    digitalWrite(Relay_Battery, LOW);
    digitalWrite(Relay_BatteryN, LOW);
    //ON The Solar System
    digitalWrite(Relay_Solar, HIGH);
    digitalWrite(Relay_Gnd, HIGH);
    if(Blue_Val == '1')
    {
      digitalWrite(Relay_High, HIGH);
    }
    else if(Blue_Val == '2')
    {
      digitalWrite(Relay_Normal, HIGH);
    }
    else if(Blue_Val == '3')
    {
      digitalWrite(Relay_Low, HIGH);
    }
    else if(Blue_Val == '9')
    {
      digitalWrite(Relay_High, HIGH);
      digitalWrite(Relay_Normal, HIGH);
      digitalWrite(Relay_Low, HIGH);
    }
    else if(Blue_Val == 'I')
    {
      digitalWrite(Relay_High, LOW);
      digitalWrite(Relay_Normal, LOW);
      digitalWrite(Relay_Low, LOW);
    }
    else
    {
      digitalWrite(Relay_High, HIGH);
      digitalWrite(Relay_Normal, HIGH);
      digitalWrite(Relay_Low, HIGH);
    }
  }
//------------------------------------------------------------------
//---------------- SOLAR OFF, GRID ON, BATTERY ON -------------------
//------------------------------------------------------------------
  if(Solar_Volts < 2 && Grid_Volts >= 2 && Battery_Volts >= 2)
  {
    lcd.setCursor(0,0);
    lcd.print("SYSTEM: GRID           ");
    lcd.setCursor(0,1);
    lcd.print("S: OFF G: ON B: ON      ");
    //OFF The Solar and Battery System
    digitalWrite(Relay_Solar, LOW);
    digitalWrite(Relay_Battery, LOW);
    digitalWrite(Relay_BatteryN, LOW);
    //ON The Grid System
    digitalWrite(Relay_Grid, HIGH);
    digitalWrite(Relay_Gnd, HIGH);
  if(ButtonState_PH == 1)
  {
    lcd.setCursor(0,2);
    lcd.print("Peak Hours: NO        ");
    if(Blue_Val == '1')
    {
      digitalWrite(Relay_High, HIGH);
    }
    else if(Blue_Val == '2')
    {
      digitalWrite(Relay_Normal, HIGH);
    }
    else if(Blue_Val == '3')
    {
      digitalWrite(Relay_Low, HIGH);
    }
    else if(Blue_Val == '9')
    {
      digitalWrite(Relay_High, HIGH);
      digitalWrite(Relay_Normal, HIGH);
      digitalWrite(Relay_Low, HIGH);
    }
    else if(Blue_Val == 'I')
    {
      digitalWrite(Relay_High, LOW);
      digitalWrite(Relay_Normal, LOW);
      digitalWrite(Relay_Low, LOW);
    }
    else
    {
      digitalWrite(Relay_High, HIGH);
      digitalWrite(Relay_Normal, HIGH);
      digitalWrite(Relay_Low, HIGH);
    }
  }
  if(ButtonState_PH == 0)
  {
    lcd.setCursor(0,2);
    lcd.print("Peak Hours: YES        ");
    if(Blue_Val == '3')
    {
      digitalWrite(Relay_Low, HIGH);
    }
    else if(Blue_Val == '2')
    {
      digitalWrite(Relay_Normal, HIGH);
    }
    else if(Blue_Val == '9')
    {
      digitalWrite(Relay_Low, HIGH);
      digitalWrite(Relay_Normal, HIGH);
    }
    else if(Blue_Val == 'I')
    {
      digitalWrite(Relay_High, LOW);
      digitalWrite(Relay_Normal, LOW);
      digitalWrite(Relay_Low, LOW);
    }
    else
    {
      digitalWrite(Relay_Low, HIGH);
      digitalWrite(Relay_Normal, HIGH);
      digitalWrite(Relay_High, LOW);
    }
  }
  }
//------------------------------------------------------------------
//---------------- SOLAR OFF, GRID ON, BATTERY OFF -------------------
//------------------------------------------------------------------
  if(Solar_Volts < 2 && Grid_Volts >= 2 && Battery_Volts < 2)
  {
    lcd.setCursor(0,0);
    lcd.print("SYSTEM: GRID           ");
    lcd.setCursor(0,1);
    lcd.print("S: OFF G: ON B: OFF      ");
    //OFF The Solar and Battery System
    digitalWrite(Relay_Solar, LOW);
    digitalWrite(Relay_Battery, LOW);
    digitalWrite(Relay_BatteryN, LOW);
    //ON The Grid System
    digitalWrite(Relay_Grid, HIGH);
    digitalWrite(Relay_Gnd, HIGH);
  if(ButtonState_PH == 1)
  {
    lcd.setCursor(0,2);
    lcd.print("Peak Hours: NO        ");
    if(Blue_Val == '1')
    {
      digitalWrite(Relay_High, HIGH);
    }
    else if(Blue_Val == '2')
    {
      digitalWrite(Relay_Normal, HIGH);
    }
    else if(Blue_Val == '3')
    {
      digitalWrite(Relay_Low, HIGH);
    }
    else if(Blue_Val == '9')
    {
      digitalWrite(Relay_High, HIGH);
      digitalWrite(Relay_Normal, HIGH);
      digitalWrite(Relay_Low, HIGH);
    }
    else if(Blue_Val == 'I')
    {
      digitalWrite(Relay_High, LOW);
      digitalWrite(Relay_Normal, LOW);
      digitalWrite(Relay_Low, LOW);
    }
    else
    {
      digitalWrite(Relay_High, HIGH);
      digitalWrite(Relay_Normal, HIGH);
      digitalWrite(Relay_Low, HIGH);
    }
  }
  if(ButtonState_PH == 0)
  {
    lcd.setCursor(0,2);
    lcd.print("Peak Hours: YES        ");
    if(Blue_Val == '3')
    {
      digitalWrite(Relay_Low, HIGH);
    }
    else if(Blue_Val == '2')
    {
      digitalWrite(Relay_Normal, HIGH);
    }
    else if(Blue_Val == '9')
    {
      digitalWrite(Relay_Low, HIGH);
      digitalWrite(Relay_Normal, HIGH);
    }
    else if(Blue_Val == 'I')
    {
      digitalWrite(Relay_High, LOW);
      digitalWrite(Relay_Normal, LOW);
      digitalWrite(Relay_Low, LOW);
    }
    else
    {
      digitalWrite(Relay_Low, HIGH);
      digitalWrite(Relay_Normal, HIGH);
      digitalWrite(Relay_High, LOW);
    }
  }
  }
//------------------------------------------------------------------
//---------------- SOLAR OFF, GRID OFF, BATTERY ON -------------------
//------------------------------------------------------------------
  if(Solar_Volts < 2 && Grid_Volts < 2 && Battery_Volts >= 2)
  {
    lcd.setCursor(0,0);
    lcd.print("SYSTEM: BATTERY           ");
    lcd.setCursor(0,1);
    lcd.print("S: OFF G: OFF B: ON      ");
    //OFF The Solar and Grid System
    digitalWrite(Relay_Solar, LOW);
    digitalWrite(Relay_Grid, LOW);
    digitalWrite(Relay_Gnd, LOW);
    //ON The Battery System
    digitalWrite(Relay_Battery, HIGH);
    digitalWrite(Relay_BatteryN, HIGH);
    if(ButtonState_B40 == 0)
    {
      lcd.setCursor(0,2);
      lcd.print("BATTERY > 40%       ");
      if(Blue_Val == '3')
      {
        digitalWrite(Relay_Low, HIGH);
      }
      else if(Blue_Val == '2')
      {
        digitalWrite(Relay_Normal, HIGH);
      }
      else if(Blue_Val == '9')
      {
        digitalWrite(Relay_Low, HIGH);
        digitalWrite(Relay_Normal, HIGH);
      }
      else if(Blue_Val == 'I')
      {
        digitalWrite(Relay_High, LOW);
        digitalWrite(Relay_Normal, LOW);
        digitalWrite(Relay_Low, LOW);
      }
      else
      {
        digitalWrite(Relay_Low, HIGH);
        digitalWrite(Relay_Normal, HIGH);
        digitalWrite(Relay_High, LOW);
      }
    }
    if(ButtonState_B40 == 1)
    {
      lcd.setCursor(0,2);
      lcd.print("BATTERY < 40%       ");
      if(Blue_Val == '3')
      {
        digitalWrite(Relay_Low, HIGH);
      }   
      else if(Blue_Val == '9')
      {
        digitalWrite(Relay_Low, HIGH);
      }
      else if(Blue_Val == 'I')
      {
        digitalWrite(Relay_High, LOW);
        digitalWrite(Relay_Normal, LOW);
        digitalWrite(Relay_Low, LOW);
      }
      else
      {
        digitalWrite(Relay_Low, HIGH);
        digitalWrite(Relay_Normal, LOW);
        digitalWrite(Relay_High, LOW);
      }
    }
  }
//------------------------------------------------------------------
//---------------- SOLAR ON, GRID OFF, BATTERY ON -------------------
//------------------------------------------------------------------
  if(Solar_Volts >= 2 && Grid_Volts < 2 && Battery_Volts >= 2)
  {
    lcd.setCursor(0,0);
    lcd.print("SYSTEM: SOLAR           ");
    lcd.setCursor(0,1);
    lcd.print("S: ON G: OFF B: ON      ");
    lcd.setCursor(0,2);
    lcd.print("                              ");
    //OFF The Grid and Battery System
    digitalWrite(Relay_Grid, LOW);
    digitalWrite(Relay_Battery, LOW);
    digitalWrite(Relay_BatteryN, LOW);
    //ON The Solar System
    digitalWrite(Relay_Solar, HIGH);
    digitalWrite(Relay_Gnd, HIGH);
    if(Blue_Val == '1')
    {
      digitalWrite(Relay_High, HIGH);
    }
    else if(Blue_Val == '2')
    {
      digitalWrite(Relay_Normal, HIGH);
    }
    else if(Blue_Val == '3')
    {
      digitalWrite(Relay_Low, HIGH);
    }
    else if(Blue_Val == '9')
    {
      digitalWrite(Relay_High, HIGH);
      digitalWrite(Relay_Normal, HIGH);
      digitalWrite(Relay_Low, HIGH);
    }
    else if(Blue_Val == 'I')
    {
      digitalWrite(Relay_High, LOW);
      digitalWrite(Relay_Normal, LOW);
      digitalWrite(Relay_Low, LOW);
    }
    else
    {
      digitalWrite(Relay_High, HIGH);
      digitalWrite(Relay_Normal, HIGH);
      digitalWrite(Relay_Low, HIGH);
    }
  }
//------------------------------------------------------------------
//---------------- SOLAR ON, GRID OFF, BATTERY OFF -------------------
//------------------------------------------------------------------
  if(Solar_Volts >= 2 && Grid_Volts < 2 && Battery_Volts < 2)
  {
    lcd.setCursor(0,0);
    lcd.print("SYSTEM: SOLAR           ");
    lcd.setCursor(0,1);
    lcd.print("S: ON G: OFF B: OFF      ");
    lcd.setCursor(0,2);
    lcd.print("                              ");
    //OFF The Grid and Battery System
    digitalWrite(Relay_Grid, LOW);
    digitalWrite(Relay_Battery, LOW);
    digitalWrite(Relay_BatteryN, LOW);
    //ON The Solar System
    digitalWrite(Relay_Solar, HIGH);
    digitalWrite(Relay_Gnd, HIGH);
    if(Blue_Val == '1')
    {
      digitalWrite(Relay_High, HIGH);
    }
    else if(Blue_Val == '2')
    {
      digitalWrite(Relay_Normal, HIGH);
    }
    else if(Blue_Val == '3')
    {
      digitalWrite(Relay_Low, HIGH);
    }
    else if(Blue_Val == '9')
    {
      digitalWrite(Relay_High, HIGH);
      digitalWrite(Relay_Normal, HIGH);
      digitalWrite(Relay_Low, HIGH);
    }
    else if(Blue_Val == 'I')
    {
      digitalWrite(Relay_High, LOW);
      digitalWrite(Relay_Normal, LOW);
      digitalWrite(Relay_Low, LOW);
    }
    else
    {
      digitalWrite(Relay_High, HIGH);
      digitalWrite(Relay_Normal, HIGH);
      digitalWrite(Relay_Low, HIGH);
    }
  }
//------------------------------------------------------------------
//---------------- SOLAR OFF, GRID OFF, BATTERY OFF -------------------
//------------------------------------------------------------------
  if(Solar_Volts < 2 && Grid_Volts < 2 && Battery_Volts < 2)
  {
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("NO SOURCE AVAILABLE             ");
  }
}