Im doing a project at the moment in college with an RFID dispaly system.I had the LCD code working last Friday no issues.Then I wanted to use it again and now the LCD wont display the text only squares.I can upload the code if requested but I dont think its necessary as it is only 6 lines of the most basic Lcd code (Lcd.begin, Lcd.write .....) and also it worked last Friday.
Anybody had similar issues?Is there some underlying software issue?
If it was working last Friday, and today it is not, I would expect it is something that you have changed.
Did you change the sketch?
Did you re-wire it?
What is different now than last Friday?
... and now the LCD wont display the text only squares.
Do you mean that the first line of your two line display is completely full of rectangular blocks or do you mean that you get stuff displayed in the correct places but you actually see squares instead of characters? There's a difference.
Thanks to you for looking at my post, but now I have replaced the pin header on the board.There must have been a slight connection problem as it is working now.