#include <LiquidCrystal.h> 
const int rs = 13, en = 12, d4 = 11, d5 = 10, d6 = 9, d7 = 8; 
LiquidCrystal lcd(rs, en, d4, d5, d6, d7); 
char key2;

void setup() {
  // put your setup code here, to run once:
  lcd.begin(16, 2); 
  lcd.setCursor(0, 0); 
  lcd.print("Test Keypad");

  pinMode(0, OUTPUT); 
  pinMode(1, OUTPUT); 
  pinMode(2, OUTPUT); 
  pinMode(3, OUTPUT); 
  pinMode(4, INPUT_PULLUP); 
  pinMode(5, INPUT_PULLUP);
  pinMode(6, INPUT_PULLUP); 
  pinMode(7, INPUT_PULLUP);
}

void loop() {
  // put your main code here, to run repeatedly:
  key2=' '; 
  digitalWrite(3, LOW); 
  digitalWrite(2, HIGH); 
  digitalWrite(1, HIGH); 
  digitalWrite(0, HIGH); 
  if (digitalRead(7) == LOW)key2 = '1'; 
  if (digitalRead(6) == LOW)key2 = '4'; 
  if (digitalRead(5) == LOW)key2 = '7'; 
  if (digitalRead(4) == LOW) key2 = '*'; 
  digitalWrite(3, HIGH); 
  digitalWrite(2, LOW); 
  digitalWrite(1, HIGH); 
  digitalWrite(0, HIGH); 
  if (digitalRead(7) == LOW)key2 = '2'; 
  if (digitalRead(6) == LOW)key2 = '5'; 
  if (digitalRead(5) == LOW)key2 = '8'; 
  if (digitalRead(4) == LOW) key2 = '0'; 
  digitalWrite(3, HIGH); 
  digitalWrite(2, HIGH); 
  digitalWrite(1, LOW); 
  digitalWrite(0, HIGH); 
  if (digitalRead(7) == LOW)key2 = '3'; 
  if (digitalRead(6) == LOW)key2 = '6'; 
  if (digitalRead(5) == LOW)key2 = '9'; 
  if (digitalRead(4) == LOW)key2 = '#'; 
   digitalWrite(3, HIGH); 
  digitalWrite(2, HIGH); 
  digitalWrite(1, HIGH); 
  digitalWrite(0, LOW); 
  if (digitalRead(7) == LOW)key2 = 'A'; 
  if (digitalRead(6) == LOW)key2 = 'B'; 
  if (digitalRead(4) == LOW)key2 = 'D'; 
  if (digitalRead(5) == LOW) {
    lcd.setCursor(0, 1); 
    lcd.print("   ");
  }
  if (key2 != ' ') {
    lcd.setCursor(0, 1); 
    lcd.print(key2); 
    key2 = ' '; 
  }
}