LED SignBoard 64X8 - PIC 16F628A - Page 3 - Electronic Circuits Projects Diagrams Free

Mike, K8LH · 19th April 2009, 02:18 PM

Burt,

I'm scanning rows not rolls...

AtomSoft · 19th April 2009, 02:39 PM

heh i think i get it now. Ill order some parts from my dipmicro and bgMicro and get started on this. The small 5x7 matrix's are cool since they are small and take up almost no space lol GREAT FOR BREADBOARD.

be80be · 19th April 2009, 02:42 PM

Where I come from a rows a rows even if you spell it rolls I used this chip for my row driver
DS75492 MOS-to-LED Hex Digit Driver

Mike, K8LH · 19th April 2009, 03:02 PM

Jason (AtomSoft),

Great. Your red/green display experiments should be fun. I'm very curious about the color combinations you can get with those displays. For example, hook up a potentiometer to an ADC input and use that to set the PWM duty cycle then show us some of the 1024 colors you get between solid red and solid green.

Have fun. Mike

be80be · 19th April 2009, 05:51 PM

Don't they look the same

and this

AtomSoft · 19th April 2009, 05:57 PM

lol hah your crazy lol

MrDEB · 19th April 2009, 06:27 PM

They have the code, circuit boards etc. even where to obtain the Allergo chip for free (I have 6 of them as I was/am planning on building such a unit.
using Vixen software on a PC but pretty sure it can be done as a stand alone unit.

MrDEB · 19th April 2009, 06:31 PM

look at the Ledtriks
Main Page - Christmasinshirley.com

be80be · 19th April 2009, 08:33 PM

That's not what there doing there making led signs boards this is with a 12f683 and it can light 105 leds with only 5 pins and yes it will do more then this but I'm not posting because I will never get what I want to do done for all the pm's.

3v0 · 19th April 2009, 10:33 PM

Quote:

Originally Posted by be80be

...but I'm not posting because I will never get what I want to do done for all the pm's.

Try using this (or similar) in your signature. With it I only get one or two a week.

Please post questions to the forums. PM's are for personal communication.

Tech questions are best asked in the public forum where all can make use of the info.

Instinct · 24th September 2009, 01:40 PM

Hello people!

I`m absolutely new in uC, and i`m a woman, what maybe explain my misunderstanding

Sooo, I read whole threat again and again, but still don`t get it how Gayan`s matrix work

. This things with “only one row light at a time” is so cofusing to me. How long is that time actually.
Also don`t understand how many are processors at the display, is there 8 for each matrix, or 1 drive all the matrixes ?

Gays, i`m totally lost ..

Sorry for my stupid questions, but it`s really interesting to me how it works

And sorry about my poor engllish too

(

AtomSoft · 24th September 2009, 02:12 PM

A dot matrix led display project for an 8x8 or 5x7 led matrix.

Scroll down until you see:

Quote:

Multiplexing

If you tried to drive 64 individual LEDs you would need 64 individual output pins (each led connected to a output pin on one side and ground on the other).

Obviously that is a tall order so the way round it is to use persistence of vision which is a way of describing how your eye works.

Your eye reacts slowly to changes in light intensity so that if a light is turned on and off quickly enough then it does not notice that the light is off. Basically your eye remembers a light pulse for a short time.

The approximate time is 20ms so if the light is turned on at a frequency >50Hz (1/20ms) then your eye will not notice any flicker at all.

Multiplexing uses this fact to reduce the number of pins needed to drive an LED display. You can do this by splitting the 64 led display into 8 rows and 8 columns which lets you drive it using 8 row outputs and 8 column outputs. In fact the 8x8 led matrix block used here has all the leds arranged in this way already.

Instinct · 24th September 2009, 03:02 PM

Thanks for your quick answer, AtomSoft. I`m starting to read it, and hope to get it already

birdman0_o · 24th September 2009, 03:17 PM

Quote:

I`m absolutely new in uC, and i`m a woman, what maybe explain my misunderstanding

That has absolutely nothing to do with it.

Persistance of Vision is a very neat concept, think about this: How do cameras take video? How do videos work in theaters or anywhere? It is not constant feed, but a series of pictures!

I had trouble believing these facts until I had built my own POV led display and saw how wonderfully it worked.

Actually the best way would be to make one, and adjust the delay from very slow (the columns or rows will appear to be on one at a time) up until the led column or rows appear to be all on!

edmondren_89 · 27th September 2009, 05:32 AM

Dear sir,

can i have a look at ur source code?

but i only know Hi-tec c language

i would like to see your source code as i am doing a project for my diploma
which is scrolling message which is sent in by sms.

pls send to my email edmondren_89@hotmail.com

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19th April 2009, 02:18 PM	#31
Mike, K8LH	Burt, I'm scanning rows not rolls...

19th April 2009, 02:39 PM	#32
AtomSoft	heh i think i get it now. Ill order some parts from my dipmicro and bgMicro and get started on this. The small 5x7 matrix's are cool since they are small and take up almost no space lol GREAT FOR BREADBOARD. __________________ AtomSofts eBay Store AtomSoftTech: C18 TIPS & TRICKS v9 PDF Nokia 6100 Driver/Software My Name: Jason Lopez http://atomsofttech.info/ \| My YouTube Videos! My Favorite Store: dipmicro Electronics

19th April 2009, 02:42 PM	#33
be80be	Where I come from a rows a rows even if you spell it rolls I used this chip for my row driver DS75492 MOS-to-LED Hex Digit Driver __________________ Burt http://mybe80be.com http://stores.shop.ebay.com/mybe80be__W0QQ_armrsZ1 Last edited by be80be; 19th April 2009 at 02:57 PM.

19th April 2009, 03:02 PM	#34
Mike, K8LH	Jason (AtomSoft), Great. Your red/green display experiments should be fun. I'm very curious about the color combinations you can get with those displays. For example, hook up a potentiometer to an ADC input and use that to set the PWM duty cycle then show us some of the 1024 colors you get between solid red and solid green. Have fun. Mike

19th April 2009, 05:51 PM	#35
be80be	Looks like Rolls to me Don't they look the same and this __________________ Burt http://mybe80be.com http://stores.shop.ebay.com/mybe80be__W0QQ_armrsZ1

19th April 2009, 05:57 PM	#36
AtomSoft	lol hah your crazy lol __________________ AtomSofts eBay Store AtomSoftTech: C18 TIPS & TRICKS v9 PDF Nokia 6100 Driver/Software My Name: Jason Lopez http://atomsofttech.info/ \| My YouTube Videos! My Favorite Store: dipmicro Electronics

19th April 2009, 06:27 PM	#37
MrDEB	Look at DIY computer Christmas They have the code, circuit boards etc. even where to obtain the Allergo chip for free (I have 6 of them as I was/am planning on building such a unit. using Vixen software on a PC but pretty sure it can be done as a stand alone unit.

19th April 2009, 06:31 PM	#38
MrDEB	here is the link look at the Ledtriks Main Page - Christmasinshirley.com

19th April 2009, 08:33 PM	#39
be80be	That's not what there doing there making led signs boards this is with a 12f683 and it can light 105 leds with only 5 pins and yes it will do more then this but I'm not posting because I will never get what I want to do done for all the pm's. __________________ Burt http://mybe80be.com http://stores.shop.ebay.com/mybe80be__W0QQ_armrsZ1

24th September 2009, 01:40 PM	#41
Instinct	Hello people! I`m absolutely new in uC, and i`m a woman, what maybe explain my misunderstanding Sooo, I read whole threat again and again, but still don`t get it how Gayan`s matrix work . This things with “only one row light at a time” is so cofusing to me. How long is that time actually. Also don`t understand how many are processors at the display, is there 8 for each matrix, or 1 drive all the matrixes ? Gays, i`m totally lost .. Sorry for my stupid questions, but it`s really interesting to me how it works And sorry about my poor engllish too (

24th September 2009, 03:02 PM	#43
Instinct	Thanks for your quick answer, AtomSoft. I`m starting to read it, and hope to get it already

27th September 2009, 05:32 AM	#45
edmondren_89	Dear sir, can i have a look at ur source code? but i only know Hi-tec c language i would like to see your source code as i am doing a project for my diploma which is scrolling message which is sent in by sms. pls send to my email edmondren_89@hotmail.com