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Topic: LCD lighting up, but not displaying text (Read 2 times) previous topic - next topic

TheWave

Apr 14, 2012, 12:30 am Last Edit: Apr 14, 2012, 12:36 am by TheWave Reason: 1
OK so i recently purchased a 20x4 LCD made by Hacktronics http://www.hacktronics.com and i set it up with the following tutorial http://www.hacktronics.com/Tutorials/arduino-character-lcd-tutorial.html I then ran the code on the page and changed the 16,2 to 20,4 and uncommented the lines yet this is not working. The LCD lights up blue but no text is displayed. Im using 330 ohm resistors (im not sure exactly, but there blue with pink and black stripes) but nothing seems to help it. Thank you to anyone who might be able to help!!

EDIT: In the picture my resistor is not shown because i was trying other things to see if it would work, heres a close up on the resistor

floresta

#1
Apr 14, 2012, 02:35 am Last Edit: Apr 14, 2012, 02:37 am by floresta Reason: 1
We need a clear (focused) picture that unambiguously shows both ends of each wire that connects between your Arduino and your LCD module.  It would help if the picture were oriented properly instead of being reversed.  (Use two mirrors if you have to.)

Where is your potentiometer?

What size is the resistor and where are you using it?


Don

liudr

I guess you didn't solder the male pins to the display. Did I win a price? ;)

TheWave


We need a clear (focused) picture that unambiguously shows both ends of each wire that connects between your Arduino and your LCD module.  It would help if the picture were oriented properly instead of being reversed.  (Use two mirrors if you have to.)

Where is your potentiometer?

What size is the resistor and where are you using it?


Don


Ok so Im really new to this stuff, does anyone know of a tutorial or something to help me? I don't know how to get my petentiometer to do anything and I copied the picture on the website exactly and now the LCD won't even light up, I don't know what "size" the resistor is either. I'm sorry

floresta

Quote
Ok so Im really new to this stuff, does anyone know of a tutorial or something to help me? I don't know how to get my petentiometer to do anything and I copied the picture on the website exactly and now the LCD won't even light up, I don't know what "size" the resistor is either. I'm sorry


Try the Tutorial at http://www.ladyada.net/learn/lcd/charlcd.html. Be careful with the backlight connections, the text tells all about the resistor but it does not show up in the photographs.  It goes in place of the red wire at pin 15 or the black wire at pin 16.

Don

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