#include <LiquidCrystal.h>
#include <EEPROM.h>
#include <avr/pgmspace.h>

LiquidCrystal lcd(8, 9, 4, 5, 6, 7);

byte readKey(){
  byte val;
  byte in=PINB>>2;
  for(val=0;val<4;val++){
    if(bitRead(in,val)==0)break;
  }
  return val;
}


void setup() {
  PORTB=0b111100;
  Serial.begin(115200);
  lcd.begin(16,2);
  Serial.println(EEPROM.read(0));
  EEPROM.update(0,5);
  Serial.println(EEPROM.read(0));

  



}

void loop() {
  lcd.setCursor(0,0);
  lcd.print(readKey());
  delay(20);

}