#include <LiquidCrystal.h> 

int buttonPinA0 = A0;    			// select the input pin A0 for the buttons
int buttonValueA0 = 0;  			// variable to store the value coming from the sensor, Pin A0

LiquidCrystal lcd(8, 9, 4, 5, 6, 7);            // Pinout, RS=8, E=9, DB4=4, DB5=5, DB6=6, DB7=7
int numRows = 2;				// Number of rows of the LCD
int numCols = 16;				// Number of Columns of the LCD
 
void setup()					// We write the initial configuration of our program.
{

  lcd.begin(numRows, numCols);			// Allocates or initializes the number of rows and columns of the LCD.
  lcd.clear();					// Clean the LCD screen
  lcd.setCursor(0,0);				// Place the cursor at column 0, row 0.
  lcd.print("*    Arduino   *");		// Write on the screen that is indicated between quotes.
  lcd.setCursor(0,1);				// Place the cursor at column 0, row 1.
  lcd.print("*   Professor  *"); 		// Write on the screen that is indicated between quotes.
 
  delay(2000);					// Wait 2 seconds.
  
  lcd.clear();  				// Clean the LCD screen
  lcd.setCursor(0,0);				// Place the cursor at column 0, row 0.
  lcd.print("*  LCD Shield  *");		// Write on the screen that is indicated between quotes.
  lcd.setCursor(0,1);				// Place the cursor at column 0, row 1.
  lcd.print("*  and KeyPad  *"); 		// Write on the screen that is indicated between quotes.
 
  delay(3000);					// Wait 3 seconds.
  lcd.clear();  				// Clean the LCD screen

}
 
void loop()
{
  						// Read the value from the sensor:
  buttonValueA0 = analogRead(buttonPinA0);      // Reads the voltage on the corresponding pin and converts it into a digital value.
  						// which is stored in the variable "buttonValueA0".
 
  lcd.setCursor(3,0);				// Place the cursor at column 3, row 0.
  lcd.print("A0  value:"); 		        // Write on the screen that is indicated between quotes.

  lcd.setCursor(4,1);				// Place the cursor at column 4, row 1.
  lcd.print("A0: ");             		// Write on the screen that is indicated between quotes.  
  
  lcd.setCursor(8,1);				// Place the cursor at column 8, row 1.
  lcd.print(buttonValueA0);			// It is written on the screen indicated between quotes.
  delay(500);					// Wait 0.5 seconds.	
  
  lcd.setCursor(8,1);				// Place the cursor at column 8, row 1.
  lcd.print("    "); 				// Clear LCD screen begining on the (8,1) position.
  
  
  }