#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 20, 4);

#define ADCPIN A0
#define ADCPIN A3
#define ADCPIN A5

int source1;
int source2;
int source3;
float voltage;
float bat_vol;
char data[10];
float bat_per;


void setup()
{
  pinMode(2, OUTPUT);
  pinMode(19, OUTPUT);
  pinMode(18, OUTPUT);
  pinMode(5, OUTPUT);
  lcd.begin(20, 4);


  Serial.begin(115200);
}
void loop()
{

  source1 = analogRead(A0);
  source2 = analogRead(A3);
  source3 = analogRead(A5);

  voltage = source3 * 3.3 / 4095;
  bat_vol = voltage * 12.012 / 3.3;
  bat_per = bat_vol * 100 / 12.012;


  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Supply :");


  if (source1 > 0)
  {
    if (source1 >= source2 && source2 >= source3)
    {

      lcd.setCursor(9, 0);
      lcd.print("Solar ");
      digitalWrite(19, HIGH);
      digitalWrite(18, LOW);
      digitalWrite(5, LOW);
    }

    if (source1 >= source3 && source3 >= source2)
    {
      lcd.setCursor(9, 0);
      lcd.print("Solar ");
      digitalWrite(19, HIGH);
      digitalWrite(18, LOW);
      digitalWrite(5, LOW);
    }

  }



  if (source2 > 0)
  {

    if (source2 > source1 && source1 >= source3)
    {

      lcd.setCursor(9, 0);
      lcd.print("Main ");
      digitalWrite(19, LOW);
      digitalWrite(18, HIGH);
      digitalWrite(5, LOW);
    }

    if (source2 >= source3 && source3 > source1)
    {

      lcd.setCursor(9, 0);
      lcd.print("Main  ");
      digitalWrite(19, LOW);
      digitalWrite(18, HIGH);
      digitalWrite(5, LOW);
    }

  }



  if (source3 > 0)
  {

    if (source3 > source1 && source1 >= source2)
    {
      lcd.setCursor(9, 0);

      lcd.print("Battery    ");
        digitalWrite(19, LOW);
      digitalWrite(18, LOW);
      digitalWrite(5, HIGH);
    }

    if (source3 > source2 && source2 > source1)
    {

      lcd.setCursor(9, 0);
      lcd.print("Battery    ");
        digitalWrite(19, LOW);
      digitalWrite(18, LOW);
      digitalWrite(5, HIGH);
    }

  }

  if (source1 == 0 && source2 == 0 && source3 == 0)
  {
    lcd.setCursor(9, 0);
    lcd.print("No Supply");
      digitalWrite(19, LOW);
      digitalWrite(18, LOW);
      digitalWrite(5, LOW);
  }

  lcd.setCursor(0, 1);
  lcd.print("Battery   :");


  if (bat_per >= 90)
  {
    digitalWrite(2, LOW);
    lcd.print("Full");
  }

  if (bat_per < 90)
  {
    digitalWrite(2, HIGH);
    lcd.print("Charging");
    digitalWrite(5, LOW);
  }
   lcd.setCursor(11, 2);
   lcd.print(bat_per);
   lcd.print("%");

}