LED Mini Signboard PIC 16F628A - Electronic Circuits Projects Diagrams Free

Gayan Soyza · 18th October 2009, 05:24 PM

Here is a present for Mike K8LH because of his help giving to signboard lovers.

This project Named LED mini signboard.

Features

*User define message (String length = 30 letters including spaces)
*50 different characters = A-Z, 0-9 & special characters
*Battery power operation 3.6V-4.8V

This is the smallest signboard I have ever made. The nice thing with this design is you can write your own message using its two buttons.

Saving is pretty simple

Press & hold the “Select” button at anytime. It will show you letter “A”. Now release the button. At each press the “Select” button it will shift to next character.
Press “Save” button to mark the selected letter. Likewise make a sentence by the two buttons & after completing press & hold the “Save” button for 4 seconds so it will save the whole sentence in the memory. Release the button now it will scroll the message nicely that you saved.

Supportable characters

Letters
A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y, Z SPACE

Numbers
1, 2, 3, 4, 5, 6, 7, 8, 9

Special
“/” “%” “Heart” “Face” “-““=” “Comma” “Arrow” “+” “:” “Dot” “(““)””Degree”

For additional details visit my blog http://gsmicro.blogspot.com/2008/12/mini-signboard.html

zorbzz · 19th October 2009, 10:16 AM

Great project. I want to build it but can I substitute the uln 2003-darlington array with something else as I cant obtain one of these yet.
Thanks alot for letting us build it I can wait to test it.

Gayan Soyza · 19th October 2009, 11:18 AM

Yes you can replace the ULN2003 with 5 transistors.Don't forget to add 5 base resisters as well unless you add some FETs.

justDIY · 19th October 2009, 06:44 PM

Gayan, does your scrolling routine use any form of double / triple buffering? I had fiddled with a single character sign some time ago, and while scrolling static messages was easy, I ran into a mental road block in regards to code for scrolling dynamic messages, such as the time and date. Feature creep eventually killed my interest in the project - the trouble with adding too many bells and whistles.

blog post:
justDIY Project Log LED Sign has a purpose!

Gayan Soyza · 20th October 2009, 01:06 AM

Hi justDIY there are five display column registers.But all the code is done with another five of working registers.At the end of the each display frame I'm loading working registers to the column registers.

Actually this project a bit hard & gets lengthier. The secret is withing the offset values to the table patterns

I see your project too that's bravo sir.

Mike, K8LH · 20th October 2009, 01:24 AM

Very nice work Gayan.

Kind regards, Mike, K8LH

Suraj143 · 21st October 2009, 03:39 AM

This is a really nice project.Great work Gayan.

pasanlaksiri · 23rd October 2009, 06:57 AM

Woow lovely project gayan.

colin55 · 23rd October 2009, 08:32 AM

Gayan, can you put the .asm file on the forum as your website has absolutley no information on the LED Mini Signboard PIC 16F628A Project.

Gayan Soyza · 23rd October 2009, 11:16 AM

Its an ornamental project done for a client.I cannot upload the code.If he knows he will kill me at least I have given the hex with minor changes to his requirements.

AllVol · 23rd October 2009, 11:19 AM

Quote:

Originally Posted by Gayan Soyza

Its an ornamental project done for a client.

Very nice job, Gayan.

Mike, K8LH · 29th October 2009, 01:36 AM

Hi Gayan,

What do you think about this design for Cathode row 5x7 displays? Perhaps a Clock/Calendar/Alarm/Timer/Sign project? And since the 74HC595 column drivers can 'sink' or 'source' you could use the same design for Anode row displays just by swapping out the N-FET 'sinking' row drivers with P-FET 'sourcing' drivers (and a minor software change).

Regards, Mike

Gayan Soyza · 30th October 2009, 12:13 PM

Very nice sir.But I'm scared with your macMUX design its a bit complicated for me

I'll show a similar design I recently did like your last diagram.But I did by cascading the shift registers using the QH' pins.

AtomSoft · 30th October 2009, 12:54 PM

I would connect all the 595s the dame way you have it but use 1 more to control all the OE lines. And have all serial data on 1 pin. This way i can shift data to the 595 to select the first (last) 595 and then send that data...

let me make a schematic. It wont* be as pretty as mikes tho heh

EDIT:

Too lazy right now lol ill do it later on

Mike, K8LH · 30th October 2009, 01:33 PM

Hi Gayan,

It's really very simple and it takes less time to send 56 bits of data for each row scan than it would for daisy-chained shift registers. If you're interested at all please let me know and I'll do a little write up to explain how it works. Once you understand how it works it's really quite intuitive.

Regards, Mike

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19th October 2009, 10:16 AM	#2
zorbzz	Great project. I want to build it but can I substitute the uln 2003-darlington array with something else as I cant obtain one of these yet. Thanks alot for letting us build it I can wait to test it.

19th October 2009, 11:18 AM	#3
Gayan Soyza	Yes you can replace the ULN2003 with 5 transistors.Don't forget to add 5 base resisters as well unless you add some FETs. __________________ Gayan My Website http://gsmicro.blogspot.com/

19th October 2009, 06:44 PM	#4
justDIY	Gayan, does your scrolling routine use any form of double / triple buffering? I had fiddled with a single character sign some time ago, and while scrolling static messages was easy, I ran into a mental road block in regards to code for scrolling dynamic messages, such as the time and date. Feature creep eventually killed my interest in the project - the trouble with adding too many bells and whistles. blog post: justDIY Project Log LED Sign has a purpose! __________________ If you don't have a planet, what good are gold bars? want to contact me directly? gmail gordonthree check out my project website: http://projects.dimension-x.net Favorite numbers: 09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0

20th October 2009, 01:06 AM	#5
Gayan Soyza	Hi justDIY there are five display column registers.But all the code is done with another five of working registers.At the end of the each display frame I'm loading working registers to the column registers. Actually this project a bit hard & gets lengthier. The secret is withing the offset values to the table patterns I see your project too that's bravo sir. __________________ Gayan My Website http://gsmicro.blogspot.com/ Last edited by Gayan Soyza; 20th October 2009 at 01:18 AM.

20th October 2009, 01:24 AM	#6
Mike, K8LH	Very nice work Gayan. Kind regards, Mike, K8LH

21st October 2009, 03:39 AM	#7
Suraj143	This is a really nice project.Great work Gayan.

23rd October 2009, 06:57 AM	#8
pasanlaksiri	Woow lovely project gayan. __________________ Pasan...

23rd October 2009, 08:32 AM	#9
colin55	Gayan, can you put the .asm file on the forum as your website has absolutley no information on the LED Mini Signboard PIC 16F628A Project.

23rd October 2009, 11:16 AM	#10
Gayan Soyza	Its an ornamental project done for a client.I cannot upload the code.If he knows he will kill me at least I have given the hex with minor changes to his requirements. __________________ Gayan My Website http://gsmicro.blogspot.com/ Last edited by Gayan Soyza; 23rd October 2009 at 11:17 AM.

29th October 2009, 01:36 AM	#12
Mike, K8LH	Hi Gayan, What do you think about this design for Cathode row 5x7 displays? Perhaps a Clock/Calendar/Alarm/Timer/Sign project? And since the 74HC595 column drivers can 'sink' or 'source' you could use the same design for Anode row displays just by swapping out the N-FET 'sinking' row drivers with P-FET 'sourcing' drivers (and a minor software change). Regards, Mike Attached Thumbnails Last edited by Mike, K8LH; 29th October 2009 at 01:39 AM.

30th October 2009, 12:13 PM	#13
Gayan Soyza	Very nice sir.But I'm scared with your macMUX design its a bit complicated for me I'll show a similar design I recently did like your last diagram.But I did by cascading the shift registers using the QH' pins. __________________ Gayan My Website http://gsmicro.blogspot.com/ Last edited by Gayan Soyza; 30th October 2009 at 12:14 PM.

30th October 2009, 12:54 PM	#14
AtomSoft	I would connect all the 595s the dame way you have it but use 1 more to control all the OE lines. And have all serial data on 1 pin. This way i can shift data to the 595 to select the first (last) 595 and then send that data... let me make a schematic. It wont* be as pretty as mikes tho heh EDIT: Too lazy right now lol ill do it later on __________________ 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 Last edited by AtomSoft; 30th October 2009 at 01:02 PM.

30th October 2009, 01:33 PM	#15
Mike, K8LH	Hi Gayan, It's really very simple and it takes less time to send 56 bits of data for each row scan than it would for daisy-chained shift registers. If you're interested at all please let me know and I'll do a little write up to explain how it works. Once you understand how it works it's really quite intuitive. Regards, Mike