Displaying contrast of LCD via Arduino

This is a very simple Arduino program which detects the contrast on your LCD and display which configuration is perfect and which is not. I think the code is self explainable but if there is any confusion please do ask.

I used

• A potentiometer (Trimpot – 10K)
• Arduino Uno
• 16×2 LCD Display(4 bit mode)

replace “LiquidCrystal.h” with <LiquidCrystal.h>

// include the library code:
#include "LiquidCrystal.h" 
 int pin=A5;
 int value=0;
// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(2, 4, 8, 9, 10, 11);

void setup() {
  Serial.begin(9600);

  // set up the LCD's number of columns and rows: 
  lcd.begin(16, 2);

  // Tell Arduino to treat A5 pin as INPUT
  pinMode(pin,INPUT);

}

void loop() {
  value= analogRead(pin);

  // set the cursor to column 3, line 0
  // (note: line 1 is the first row, since counting begins with 0):
  lcd.setCursor(3, 0);
  lcd.print("Namaste");

  // set the cursor to column 0, line 1 
  lcd.setCursor(0, 1);

  // Potentiometer Range
  if(value>=250){
  Serial.println("It's too bright");
  lcd.print("It's too bright");
  }
  else if(value>=210 && value<250)
   {   
    Serial.println("A little bright");   
    lcd.print("A little bright");   
   }   
   else if (value>=90 && value<210)
   {
    Serial.println("Perfect! :)");   
    lcd.print("Perfect! :)");
   }
   else if(value>42 && value<90)
   {
    Serial.println("It's Okay :|");
    lcd.print("It's Okay :|");
   }
   else if(value<42)
   {
     Serial.println("Too Dark :(");
     lcd.print("Too Dark :(");
   }
//Print value on serial monitor 
   Serial.println(value);
// delay of 500 milli seconds
  delay(500);
//clear LCD screen
  lcd.clear();
}