LED Matrix Display Drivers (5x7)?

Nitrohawk

Does anyone suggest drivers for five LED Matrix Displays?

Here is a link to the LED Matrix components:

http://rocky.digikey.com/WebLib/Lite-on/Web%20Data/LTP-747KR.pdf


My end goal is to have an intresting clock display for my desktop.

Ideas or suggestions?

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Nitrohawk

Jon Williams

MAX7219 -- and here's a link to a simple project I did for Nuts & Volts using it: http://www.parallax.com/dl/docs/cols/nv/vol2/col/nv70.pdf

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Jon Williams
Applications Engineer, Parallax

Nitrohawk

Oh Jon,

What we do without you?! This is exactly what I was looking for. I guess if I have a whole mess of them (5x7 LED Matrix) I would have to buy a MAX7219 for each display?

I admit, I just scanned your Nuts & Volts... Going to print it out and take home to read tonight.

Thanks!

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Nitrohawk

Jon Williams

Yes, each MAX7219 can handle up to 64 discrete LEDs (8x8 matrix), so you'll need one per display. The MAX7219 is not cheap, and I think there are alternatives (Allegro?) -- but I've not used any myself.

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Jon Williams
Applications Engineer, Parallax

Newzed

I have a 3 x 4 wall map of the United States with 64 LEDs arranged in an 8x8 matrix.· I am driving the LEDs with a BS2E and two 595 shift registers.
Works great - I can turn on a single LED, turn on two LEDs with different ON times (deparature and destination) or flash all 64 in a random pattern.
It takes 3 Stamp I/O lines for 64 LEDs.· With two more 595s and one more Stamp I/O line I could run 128.· The 64 LEDs indicate the airports I use in Flight Simulator from Burlington, VT, to San Diego.

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Sid Weaver
Do you have a Stamp Tester yet?
http://hometown.aol.com/newzed/index.html

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Jon Williams

That works well when you're lighting one 64 LEDs, but for displaying characters on a matrix display like Nitro's I think it would consume a lot of code space and not allow him to do very much else.

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Jon Williams
Applications Engineer, Parallax

Kaos Kidd

MAX6955APL... I2C interface, 128 LEDS... simple hook up...
(I just got mine in today... I can't wait till the NEW laptop arrives...)

KK

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Just tossing my two bits worth into the bit bucket

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KK
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T&E Engineer

NitroHawk,

I also have some LTP747 from Jameco which I beleive are common Anode and Jon's circuit calls for common Cathode so the 5x7 is actually a 7x5 dot matrix display - depending on how you look at it. I have attached·some modified versions of his circuit which uses the LTP747 for you to study. It does not use the joystick functionality.

Thanks.

T&E Engineer

Here is a few more files I created that can test the LTP747.

Thanks.

Nitrohawk

Mr. Engineer,

Thanks a bunch. I will have to check these out and see how I might be able to glean some of your wisdom.

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Nitrohawk