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Topic: all pins eaten up by LCD - help needed (Read 685 times) previous topic - next topic

Hi dudes,

I recently got my hands on one of the UTFT supported LCD Displays,
the Display itself is working pretty well, but I have one mayor problem:

Can I haz more I/O plz? D:

The Display is eating up exactly every possible pin on my UNO but the display for itself
isnt quite usefull.

There is one option that I think how it would work:

Is it possible to acces the controlling pins (as I hope they are not as timing critical as the data pins)
via an shift register to free up some pins?

Greetings from Germany
Ijon_Tichi


MAS3

#1
Mar 15, 2013, 06:46 pm Last Edit: Mar 15, 2013, 06:48 pm by MAS3 Reason: 1
Quote from: number Johnny 5

Need...

More...

Input..


What display it is ?
How is it connected ?
What are you trying to display ?
Pure text ?
Graphics ?
Or both ?
How many more pins do you need ?

I would say go for a larger Arduino, but you'd have to give some more info.
Have a look at "blink without delay".
Did you connect the grounds ?
Je kunt hier ook in het Nederlands terecht: http://arduino.cc/forum/index.php/board,77.0.html

oh, sorry, my fault.

It is an

3,2" "Model HY32D"
320x240 pixel
SSD1289 controller
with 16bit parallel interface

Its connected with
RST; CS; WR; RS to analog in 2 to 5
and
Data 0 to 15 at the Digital pins 0 to 13 and analog in 0 and 1

Actually I am displaying the demo of the UTFT library, which uses
text and graphics as I would like to use too later

greetings
Ijon_Tichi

HazardsMind

#3
Mar 15, 2013, 07:24 pm Last Edit: Mar 15, 2013, 09:07 pm by HazardsMind Reason: 1
Quote
Need...

More...

Input..


-_-   Short Circuit is my favorite movie, and he says "Malfunction, need input."

Wow, I just sounded like a nerd.
My GitHub:
https://github.com/AndrewMascolo?tab=repositories

retrolefty

Have you used up all your analog input pins? They can also be used as digital input or output pins.

Lefty

CrossRoads

You can supply the Data pins via shift register - might require a libary change to use say SPI pins D10-11-13 to load the shift register (2 of them daisy chained) before the control lines are manipulated.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

Im a bit afraight of the timing, but I will take a look into the
library for using shift register, thankfully I have some shift registers lying
arround.

I'll keep you updated whats happened then :)

thanks for the infos.

greetings
Ijon_Tichi

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