extra button to lcd shield

Projects Programming
1

hi i pulling almost my hairs out i have a lcd shield and the buttons on that works fine.
BUT i want a extra button that does the same action as on of the shield buttons
i thoucht i use pull_up and voila but i can get it going.. :confused:

Keypad_value = analogRead(keypad_pin);

if(Keypad_value < 100)
return 'R';
else if(Keypad_value < 200)
return 'U';
else if(Keypad_value < 400)
return 'D';
else if(Keypad_value < 600)
return 'L';
else if(Keypad_value < 800)
return 'S';
else
return 0;

i just want a external (extra) "S" button
how do i do that?
im not a genius at programming so mabe someone can help me..

grtz Edwin

2

Try:

Keypad_value = analogRead(keypad_pin);
 
  if(Keypad_value < 100)
    return 'R';
  else if(Keypad_value < 200)
    return 'U';
  else if(Keypad_value < 400)
    return 'D';
  else if(Keypad_value < 600)
    return 'L';
  else if(Keypad_value < 800 || digitalRead(extraButtonPin) == LOW)
    return 'S';
  else
    return 0;

Make sure new button is wired from GND to input pin with INPUT_PULLUP enabled.