4 bit LCD library and Hitachi HD44780 compatible display

Other Hardware Displays
3

floresta:
What we really need to know is:

  1. The specific display that you are using.
  2. The specific version of the Arduino IDE that you are using.
  3. The specific library that you are using.
  4. ALL of the connections to your display (did you connect pins 3 and 5?).
  5. ALL of the code that you are using.
  6. The exact contents of the display that resulted (did the quotation marks and exclamation point really disappear?).
  7. How you managed to get 22 characters displayed on a 20 character wide display.

Then we may be able to give some specific help.

Don

modified above post to reflect the questions