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Author Topic: Ethernet and LCD shield compatibility  (Read 904 times)
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Reading, Berkshire
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Hello
I'm starting a new project involving an Uno, Arduino Ethernet shield and a Sparkfun LCD-09363.

I would like to be able to stack them all up into a tidy project.

http://shieldlist.org/arduino/ethernet-v5
http://shieldlist.org/sparkfun/colorlcd

I'm not sure if they can function when stacked. I think they both use pins D4, D11 and D13.
Will this cause problems if I try to run them together in this way?

Thanks

Stu
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Norfolk UK
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I think the only clashing pin would be D4 that can be connected to one of the switches on the LCD and is CS for the Ethernet shields SD card. If you not using the switches or the SD card then probably no problem.
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Topsham, Vermont USA
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If you find there's not enough vertical space for the Ethernet connector, you can add stacking spacers like these:
http://goo.gl/aDS1H


DISCLAIMER: Mentioned stuff from my own shop...
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Reading, Berkshire
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Thank you for your help. That's great news. I'm not using the buttons or SD card for this project.

Unfortunatly I'm in the UK so I won't be buying the spacers from the U.S.
Thanks for the link though, this project does need them.
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Reading, Berkshire
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As it turns out there is a problem in compatibility.

lifted from - https://www.sparkfun.com/products/9363

Quote
NEMX
ksr,
I just noticed a similar problem with the LCD shield connected on top of the Ethernet shield. The LCD shield starts up, but there seems to be a loop quickly refreshing the image of the Sparkfun Logo with the white background. This image was tied to the S1 button when the LCD was connected directly to my Uno.

ksr
Thanks

NEMX
Still no response from anyone with any information on this issue? ..Disappointing..

Peter D
Is the code you have for writing on the lcd in the loop or setup part of the sketch? If it’s in the loop it will automatically redraw it every time it goes through loop unless it is in a conditional element.

NEMX
The code is exactly as provided on your blog; I put it on my Arduino for a way to quickly get familiar with this shield. My problem is as follows: When the shield is directly connected to the base Uno the code seems to work fine, but when the shield is connected as LCD —> Ethernet —> Uno the code seems to infinitely be looping in refreshing the Sparkfun image with white background (code is still unmodified).

 Pearce
Are you using these with a Duemilanove?

uberlinuxguy
I’ve noticed the same issue. After a little bit of noodling, I think it might be linked to the way that the LCD’s code is accessing the LCD vs. what is expected. Out of curiosity, are you also including the Ethernet library when you hook up the ethernet shield?
Also, the LCD shares a pin with the Ethernet shield (pin 4 for switch/button 2). The ioinit code for the LCD seems to set this pin as an Input which, from reading on the Ethernet Shield, might make the SD card slot angry. Not sure how angry, but perhaps angry enough to upset the controller/communications. Removing that and setting it as Output doesn’t seem to help much. I can get it to display some stuff, but as soon as I start using the Ethernet library, everything goes off to never-never land. I am wondering if that has to do with the Ethernet library coded to use the SPI library and the LCD library coded to send hard bytes over the SPI bus…

uberlinuxguy
I’ve been meaning to try my hand at recoding the LCD Library to use the SPI library, but I haven’t had the time to look into it and I’m still relatively new to the whole thing.

JustinF
Has any one got this to work with the Ethernet shield ? ,I really want to get this screen but if it wont work with the Ethernet shield it will be pointless for me.

Member #367453
I’m having exactly the same problem. I’ve already bought the shield. My separate test sketches worked fine. The second I integrated them all together, it stopped working. I am wondering, as I am not using the SD card or the buttons on the LCD shield, can I alter one of the libraries slightly to not include a section that is causing this problem? I’m new to this realm of development. Any suggestions of shields or Displays that work well showing or representing serial data, or any solutions to this problem would be much appreciated. The shields look so good stacked up together, it would be a shame to use an external 16x2.

Any ideas on how to remedy this?

I'm using the  <gLCD.h> LCD library and Ethernet shield. .. I was wondering, As I don't need to use the buttons on the LCD shield OR the SD card on the Ethernet, would removing these sections from the libraries make any difference? My first thought - no, because they are not called upon in the sketch. It's a long shot but I'd rather tackle this problem and use a tidy looking LCD than fork out another £20 for a 20x4 just to display serial data on location.

Thanks

Stu
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Miramar Beach, Florida
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I haven't tried the LCD, but it uses a 9 bit SPI interface, not 8 bit like the w5100. I can see where that could cause a compatibility problem.
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