// Potentiometer is connected to A0
#include <LiquidCrystal_I2C.h>
   int LEDpins[] = {3, 8, 13};
   int Blue = LEDpins[0];
   int Green = LEDpins[1];
   int Red = LEDpins[2];
#define I2C_ADDR    0x27
#define LCD_COLUMNS 16
#define LCD_LINES   2
LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

void setup() 
{
   lcd.init();
//lcd.backlight();
lcd.backlight(); // turn on backlight of lcd
 // put your setup code here, to run once:
  Serial.begin(9600); // Initialize serial communication
  for(int x=0; x<3; x++)
  { // open for loop

  pinMode(LEDpins[x], OUTPUT);


  }// close for loop
}

void loop() 
{
  // put your main code here, to run repeatedly:
  int sensorValue = analogRead(A0); // Read the analog value from pin A0
  double voltage = sensorValue* (double)5/1023;
  //voltage = sensorValue* (double)5/1023;
  
  Serial.print("Potentiometer Value: ");
  Serial.println(voltage);
  Serial.print("corresponding Digital value: ");
  Serial.println(sensorValue); // Print the value to the serial monitor
  lcd.setCursor(0, 0); //cell,row
  lcd.print("Input= ");
  lcd.print(voltage);
  lcd.setCursor(0, 1); //cell,row
  lcd.print("                        ");
  lcd.setCursor(0, 1); //cell,row
  lcd.print("digital= ");
  lcd.print(sensorValue);

  
  delay(500); // Wait for 500 milliseconds
  
  
  
  if( voltage < 1.5)
  { 
    digitalWrite(Blue, HIGH);
    digitalWrite(Green, LOW);
    digitalWrite(Red, LOW);

  }
  else if( (voltage >= 1.5) && (voltage <= 4))
  {
    digitalWrite(Green, HIGH);
    digitalWrite(Blue, LOW);
    digitalWrite(Red, LOW);
  }
  else 
  {
    digitalWrite(Red, HIGH);
    digitalWrite(Green, LOW);
    digitalWrite(Blue, LOW);
  }
  /*else
  {
    digitalWrite(Red, LOW);
    digitalWrite(Green, LOW);
    digitalWrite(Blue, LOW);
  }*/

  
  
}