#include <LiquidCrystal.h> 

int sensorPinA0 = A0;    						// select the input pin A0 for the potentiometer
int sensorValueA0 = 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:
  sensorValueA0 = analogRead(sensorPinA0);      // Reads the voltage on the corresponding pin and converts it into a digital value.
												// which is stored in the variable "sensorValueA0".
 
  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(sensorValueA0);						// It is written on the screen indicated between quotes.
  delay(1000);									// Wait 1 second.	
  
  lcd.setCursor(8,1);							// Place the cursor at column 8, row 1.
  lcd.print("    "); 							// Clear LCD screen begining on the (3,1) position.
    
  }