LED SignBoard 64X8 - PIC 16F628A - Electronic Circuits Projects Diagrams Free

Gayan Soyza · 8th March 2009, 03:32 PM

Here is a recent signboard I have designed under a PIC 16F628A, 4MHz.

It’s a 64 X 8 led matrix board (64 columns & 8 rows).

Didn’t work much hard with code stuff. Just added some basic scrolling.

I cannot resist I want to show what I had in my mind.

Here is a video of my project & some pictures of that.(Photography from - Pasans camera)

Light - YouTube - SignBoard Light

Dark- YouTube - SignBoard Dark

edeca · 8th March 2009, 04:52 PM

Very nice! Do you have a schematic to show how you did the multiplexing?

It looks great.

Gayan Soyza · 9th March 2009, 03:55 AM

Hi thanks.

I do a row scan.I use 74HC164 shift register + ULN2803 per 8X8 matrix.Likewise I have cascaded 8 sets together.

I'll post a schematic recently.

Mike, K8LH · 11th March 2009, 12:52 PM

Very nice Gayan.

I would like to see the schematic too just to see how you're latching column data.

Mike

Gayan Soyza · 13th March 2009, 03:47 AM

Hi thanks for your view.

I'm doing a column scan in this project & I was doing a row scan in some other design.

Here is a schematic of the design.

be80be · 13th March 2009, 05:12 AM

That's sweet looks real good

Mike, K8LH · 13th March 2009, 01:48 PM

Well your display looks surprisingly nice with such a low 1.5625% (1/64th) duty cycle.

mabauti · 14th March 2009, 02:32 AM

Awesome! (º<

Gayan Soyza · 16th March 2009, 05:54 AM

Thanks guys.

I was making some boxes these days actually its harder than designing the project.

Reg brightness you can still reduce the 47R resister but I wont' recommend.Don't know when uC will stop run & the particular column would be blown :O

With column scanning method I'd like to add some more columns & see if its fine then ok otherwise shift to row scanning technic.

muralieb · 11th April 2009, 03:19 AM

kindly publish the codes....

colin55 · 11th April 2009, 04:40 AM

Quote:

Well your display looks surprisingly nice with such a low 1.5625% (1/64th) duty cycle.

I's a "run of 8" not 64.

Mike, K8LH · 11th April 2009, 06:28 PM

Quote:

Originally Posted by colin55

I's a "run of 8" not 64.

Gayan has daisy-chained the column driver shift registers so he is only lighting one of sixty-four columns at a time.

Mike

be80be · 11th April 2009, 06:43 PM

Quote:

I's a "run of 8" not 64.

I couldn't get how he came up with 8 seeing he was rolling threw 64 one at a time lol

colin55 · 11th April 2009, 09:52 PM

He's loading 64 and scanning from top to bottom in a "run of 8."

Mike, K8LH · 12th April 2009, 06:44 PM

Quote:

Originally Posted by colin55

He's loading 64 and scanning from top to bottom in a "run of 8."

The schematic shows the current limiting resistors placed on the row driver outputs which implies that he's scanning columns.

Hey Gayan, how are you doing it?

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8th March 2009, 03:32 PM	#1
Gayan Soyza	LED Sign Board 64X8 - PIC 16F628A Here is a recent signboard I have designed under a PIC 16F628A, 4MHz. It’s a 64 X 8 led matrix board (64 columns & 8 rows). Didn’t work much hard with code stuff. Just added some basic scrolling. I cannot resist I want to show what I had in my mind. Here is a video of my project & some pictures of that.(Photography from - Pasans camera) Light - YouTube - SignBoard Light Dark- YouTube - SignBoard Dark Attached Thumbnails __________________ Gayan My Website http://gsmicro.blogspot.com/ Last edited by Gayan Soyza; 8th March 2009 at 03:39 PM.

8th March 2009, 04:52 PM	#2
edeca	Very nice! Do you have a schematic to show how you did the multiplexing? It looks great.

9th March 2009, 03:55 AM	#3
Gayan Soyza	Hi thanks. I do a row scan.I use 74HC164 shift register + ULN2803 per 8X8 matrix.Likewise I have cascaded 8 sets together. I'll post a schematic recently. __________________ Gayan My Website http://gsmicro.blogspot.com/

11th March 2009, 12:52 PM	#4
Mike, K8LH	Very nice Gayan. I would like to see the schematic too just to see how you're latching column data. Mike Last edited by Mike, K8LH; 11th March 2009 at 03:03 PM.

13th March 2009, 03:47 AM	#5
Gayan Soyza	Hi thanks for your view. I'm doing a column scan in this project & I was doing a row scan in some other design. Here is a schematic of the design. Attached Thumbnails __________________ Gayan My Website http://gsmicro.blogspot.com/

13th March 2009, 05:12 AM	#6
be80be	That's sweet looks real good __________________ Burt http://mybe80be.com http://stores.shop.ebay.com/mybe80be__W0QQ_armrsZ1

13th March 2009, 01:48 PM	#7
Mike, K8LH	Well your display looks surprisingly nice with such a low 1.5625% (1/64th) duty cycle.

16th March 2009, 05:54 AM	#9
Gayan Soyza	Thanks guys. I was making some boxes these days actually its harder than designing the project. Reg brightness you can still reduce the 47R resister but I wont' recommend.Don't know when uC will stop run & the particular column would be blown :O With column scanning method I'd like to add some more columns & see if its fine then ok otherwise shift to row scanning technic. __________________ Gayan My Website http://gsmicro.blogspot.com/ Last edited by Gayan Soyza; 16th March 2009 at 05:55 AM.

11th April 2009, 03:19 AM	#10
muralieb	kindly publish the codes....

11th April 2009, 09:52 PM	#14
colin55	He's loading 64 and scanning from top to bottom in a "run of 8."