Basic 16x2 Character LCD Project - Compatability Question

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Madness
Posts: 2
Joined: Wed Jul 14, 2010 1:28 pm

Basic 16x2 Character LCD Project - Compatability Question

Post by Madness » Wed Jul 14, 2010 2:17 pm

Hey everyone, this is my first time posting here and I'd really appreciate a little assistance on a project I'd like to take on.

I was looking for replacement screens for my Roland MC-505 as mine is on the fritz. I saw this item: http://www.sparkfun.com/commerce/produc ... cts_id=791 and as far as I understand it would work much in the same way that this one would: http://www.facebook.com/album.php?aid=5 ... 5767948970 It's basically the same item with the only difference being his is soldered onto a custom board which connects the replacement LCD's points to the molex connector on the MC-505, oh that and about $65!

I usually lean toward a diy solution to problems and this would certainly be right up my alley. I poured over the extended datasheet for the sparkfun product
LCD-1.jpg
LCD-1.jpg (57.32 KiB) Viewed 949 times
LCD-2.jpg
LCD-2.jpg (199.97 KiB) Viewed 949 times
as well as the MC-505 datasheet
Roland-MC505-groovebox-22.jpg
Roland-MC505-groovebox-22.jpg (143.71 KiB) Viewed 949 times
and could not make much sense of it; my knowledge with reading schematics is minimal.

My questions are these: Does this make much sense to anyone? Can someone assist me in this endeavor?

The original LCD for MC-505 (molex type ribbon on the side) doesn't have the same connectors as the sparkfun LCD (the pinpoints in a row on top).

Thank you very, very much to those willing to help! Is this a lost cause?

Madness
Posts: 2
Joined: Wed Jul 14, 2010 1:28 pm

Re: Basic 16x2 Character LCD Project - Compatability Question

Post by Madness » Fri Jul 16, 2010 10:48 am

I do apologize for the large attachments, I thought they would re-size.

So no one has any advice on this? Perhaps a point to a resource would be handy.

Thanks again.

60amp_relay
Posts: 44
Joined: Fri Feb 26, 2010 12:12 pm

Re: Basic 16x2 Character LCD Project - Compatability Question

Post by 60amp_relay » Fri Jul 16, 2010 6:16 pm

At a glance, it looks like it would work. The only problem I see is that the molex connector doesn't seem to have a connection for the LCD backlight. (where are pins #15 and #16?) Other than that, my semi-educated guess is that it would be compatible.

StigOE
Posts: 42
Joined: Thu Mar 11, 2010 7:50 am
Location: Norway

Re: Basic 16x2 Character LCD Project - Compatability Question

Post by StigOE » Sun Jul 18, 2010 7:00 am

It may be possible to use this display, but it's not pin-compatible, so you would have to re-wire it. The Sparkfun display and your old display both have Gnd on pin 1, but the rest of the pins don't match up.

Stig

gonzodada
Posts: 33
Joined: Mon Jul 19, 2010 3:22 pm

Re: Basic 16x2 Character LCD Project - Compatability Question

Post by gonzodada » Mon Jul 19, 2010 3:26 pm

You could match equivalent pins by looking at the datasheets for the two LCDs but then ...

... if they use different driver chips the MC505 firmware and LCD driver won't understand one another

So you need to find out what driver chips they both use.

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