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Feb 25, 2009. 10:06 PMaj218
says:
I made a 16x80 display with 8051 but i m as more characters scroll the display is getting flickering, why??
Feb 22, 2009. 2:46 AMJoell
says:
hey, this may have already come up but i dint have time to go through all the comments but could u offer a coupla tips on scaling a project like this? Like if i wanted to make a larger sign or something...
Feb 12, 2009. 1:44 PMfelipe22
says:
I too have the ability to use pcb123 software could you share the pcb file ? I would also be happy to convert it and post it.
Nov 27, 2008. 9:47 AMise
says:
in the schematic isn't the led driver, is the current from PIC enough for LEDs and safety for PIC?
Nov 24, 2008. 7:27 PMshimadax
says:
im new to this and i was wondering what kinda power supply did you use for this project, thanks
Nov 24, 2008. 4:54 AMjepoy
says:
what a wonderful project... hey guyz... i'm jef from the philippines... we're making a project that displays using 80 dot matrices... in our design, we need at least 36 i/o pins from the microcontroller... i found pic16f887microcontroller by microchip, but its programmer is too expensive... could anyone help me find a circuit diagram for our programmer... your help is greatly appreciated guyz... thanks a lot...
Nov 19, 2008. 3:58 PMbronx68
says:
It looks like you setup the column data then activate the a row, setup the column data and then activate the next row, etc.. Have you tried setting up row data and then clock columns? See any advantages with either technique?
Nov 6, 2008. 12:46 PMmooboo
says:
Hi great Project! just wondering, do you have individual pcb layouts for each side? if you do would be much appreciated. thanks.
Oct 14, 2008. 7:46 PMoreoshake
says:
this project makes no sence how do you hook up the 2 circuts ??????? you have 1 that has the mclr and shift registars that schem has no parts listed for the small components i realy need help
May 23, 2007. 5:17 PMjaypp
says:
can this be made using a PIC1684a? i am a complete beginner and these are the only PICs i have avalable to me at school.
May 23, 2007. 7:00 PMled555 (author)
says:
sure, you can use a pic1684a... but the whole point of this project is to make a usb programmable sign... which is supported by the 2550. you'll get the led sign part done with the 84a, but you'll need to implement a different method of programming the messages. -peace
May 24, 2007. 8:22 AMjaypp
says:
ok, so the PIC1684a cant be usb programmed? what is the 2550, soz i dont know a lot about this. I was also wondering if you knew if it was possible to use a winamp plugin to power the sequence the the leds flash in?
May 24, 2007. 4:55 PMled555 (author)
says:
the 2550 is another flavor of a PIC, just like the 84a. you see... microchip, the company that makes the PIC, has different lines of microprocessors... there's the 1684a, and hundreds more.
sure, a graphical equalizer display can be made using a PIC... check out these links:
http://www.brolinembedded.se/projects/led_matrix/
-this guy uses bi-color LEDs
http://forums.winamp.com/showthread.php?s=f91c4285986a19f55d3bca1159edffe4&postid=2005731
sure, a graphical equalizer display can be made using a PIC... check out these links:
http://www.brolinembedded.se/projects/led_matrix/
-this guy uses bi-color LEDs
http://forums.winamp.com/showthread.php?s=f91c4285986a19f55d3bca1159edffe4&postid=2005731
May 25, 2007. 6:18 AMjaypp
says:
thanks for those links they are very helpful, i was actually going to try and make the leds powered by the easy chords plugin for winamp which shows guitar chords and tabs. i am trying to make a guitar which has leds under the fretboard to show where you need to put your fingers for a chord, so you can play along in winamp. i don't know how possibly it is have you got any suggestions? thanx
Aug 2, 2008. 9:31 AMtwoolie
says:
Another question, where do you plan to put these LEDs? the fretboard of a guitar is highly tensioned and caries both a large moment and compressive load. therefore it would certainly not be in your best interests to start drilling holes for LEDs and putting surface mount leds between the frets would obstruct finger placement. your best bet would be to get in touch with someone who builds guitars for a living and get them to build your circuit right into it.
May 25, 2007. 12:14 PMled555 (author)
says:
jaypp, how many LEDs do you plan on having in your project... and which PIC do you plan on using?
May 25, 2007. 11:58 AMjaypp
says:
the amount of leds depends on the amount of chords i will want but the maximum is 6 (strings) x 22 (frets) = 132, however i will probably use much less than this. I am not sure which PIC to use, the only PICs we have at school are the PIC1684a with a PIC logicgator pic programmer. Is it possible to use this programmer with other PICs?
May 29, 2007. 9:16 AMled555 (author)
says:
the 1684a will do just fine for your project. i'm not familiar with the logicgator programmer, so i can't comment on that. you will pretty much want to create a matrix of LEDs, like this marquee display. if you group your LEDs into 8x8 clusters, which is most likely what you'll want to do, since the PIC has 8 bit ports, and your communication scheme will most likely use bytes, your parts list may look like this:
1 x MIC2981 - drivers, or any other high current, high voltage drivers (8 bit), this will drive the LEDs, connect this to the positive side of the LED's
3 x 74HC595 - shift registers (8 bits from MIC2981 x 8 bits from 74HC595) x 3 74HC595's = 192 LEDs, these will sink the LED's, connect these to the negative sides of the LED's
what you're trying to achieve is this:
| this is where the MIC2981 connects to the LEDs.. all LEDs in row 1 have the
| positive pin connected together
\/
rows
1+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
2+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
3+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
4+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
5+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
6+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
7+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
8+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
1 2 3 4 5 6 7 8 910111213................................24 columns
|
| this is where the 74HC595's connect to the LEDs, all LEDs in column 1
| have the negative pin of the LEDs connected together.
| columns 1-8 = first 74HC595
| columns 9-16 = second 74HC595
| columns 17-24 = third 74HC595
you would assign one LED per note, or whatever the unit is... and turn them ON/OFF accordingly. you will also have to find out how to communicate with the PIC... possibly serial communication... you'll find lots of examples on the net.
1 x MIC2981 - drivers, or any other high current, high voltage drivers (8 bit), this will drive the LEDs, connect this to the positive side of the LED's
3 x 74HC595 - shift registers (8 bits from MIC2981 x 8 bits from 74HC595) x 3 74HC595's = 192 LEDs, these will sink the LED's, connect these to the negative sides of the LED's
what you're trying to achieve is this:
| this is where the MIC2981 connects to the LEDs.. all LEDs in row 1 have the
| positive pin connected together
\/
rows
1+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
2+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
3+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
4+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
5+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
6+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
7+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
8+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
1 2 3 4 5 6 7 8 910111213................................24 columns
|
| this is where the 74HC595's connect to the LEDs, all LEDs in column 1
| have the negative pin of the LEDs connected together.
| columns 1-8 = first 74HC595
| columns 9-16 = second 74HC595
| columns 17-24 = third 74HC595
you would assign one LED per note, or whatever the unit is... and turn them ON/OFF accordingly. you will also have to find out how to communicate with the PIC... possibly serial communication... you'll find lots of examples on the net.
Aug 2, 2008. 3:00 AMtwoolie
says:
Here is a question. how did you overcome the dimming problem, i.e. if you have a sign 10x as large and only use the same row driver for all, the LEDs will have a 10th the brightness.
Jul 22, 2008. 1:03 PMMoonglass
says:
I need help with the communication to the pic, or better I need the software to communicate with the usb sign please !!! I have build it and can´t do anything with it :-(
Jul 6, 2008. 7:07 PMajfer
says:
I was wondering did you use an LED driver in the schematic at the end of your project?
Jul 4, 2008. 10:52 AMMoonglass
says:
has anybody the software in this video to control the usb led sign? please send me a mail: moonglass@web.de yours jens
Jun 20, 2008. 2:29 PMburzvingion
says:
not with pcb123... they only let you use their proprietary format.
Jun 21, 2008. 7:51 PMqwixel
says:
I have access to other software that can generate gerbers. I could get pcb123 and use it as a reference to rebuild the files for you in gerber & excellon if it interests you.
Apr 16, 2008. 6:52 AMsamurai
says:
Hi , I recently tried out 8x8 led matrix display. I used PIC16f877. to drive columns i used TPIC6B595. (although the PIC has plenty of pins i'm thinking of flexibly expanding the number of columns later. that's why i used the shift reg.) The problem is when column scanning frequency is about 80 Hz or above, I get shadows in the display. Think this is because the shitft reg. drain output fall time is not fast. i.e. when column2 is being lit, column 1 also get a shadow of this column 2. (i.e. both column 1 & column 2 selected) but i think TPIC6b595 had been used by many without problem. what's the max column scanning freq. you have gone? pls help.
Jun 20, 2008. 2:26 PMburzvingion
says:
millingabout is correct. You're probably forgetting to blank the column drivers while you update the row data. I'm currently working on a similar project that uses the TPIC6595 (no B), which is the higher power but slower cousin of the TPIC6B595. I've tested them at several kHz, and they performed admirably, so it's not the chips themselves.
Jun 6, 2008. 8:45 AMmillingabout
says:
Most chips work fine up to the M Hz range, but to your point each chip is different. Try deselecting all rows prior to changing the column.
Jun 19, 2008. 7:28 PMchrisayad
says:
thats funny LOL i have like 457347062342 led modules and im still trying to get rid of/use them help me out and buy them from me hahah!! dont have time to build!!
Jun 19, 2008. 5:22 PMoktane
says:
Here is a very old circuit, it may be useful to those building large arrays. It can handle the current of at least 672 T1 LED's! It does not include the micro controller section, just the matrix and driver details. It was reverse engineered from a very large sign. It was once driven by an 8085. :D
Nice Instructable!
Original PNG
Nice Instructable!
Original PNG
Jun 15, 2008. 12:47 AMkensterdotnet
says:
I've always wanted to make something like this, but I have zero experience with any of it. I don't know where to start and pick up the information on schematics and stuff. Do you guys have any websites where I can read this stuff?
Jan 2, 2008. 9:55 AMpcwires
says:
Cool display,I started working on a similar 1, hand made led matrix like your earlier ones.Looking into rf remote programmer so no need for PC's to re program.
Heres a clip on you tube.
http://uk.youtube.com/watch?v=G7noAIb5gJ0
Heres a clip on you tube.
http://uk.youtube.com/watch?v=G7noAIb5gJ0
Apr 22, 2008. 11:53 AMIvan1983
says:
hi pcwires yes I would like to build the scrolling sign.my e-mail is "idimkin@abv.bg" can you send me everything that i need to biuld this projekt.thanking you in anticipation.
Mar 9, 2008. 4:10 PMbronx68
says:
yes I would like to build the scrolling sign. How can I get details?
Mar 9, 2008. 6:04 PMpcwires
says:
Hi bronx68, Just got a message from the instructables robot,Do you wish to build the usb display if so then thats not mine. My display is the one with the link to you tube.Email to confirm Paul@paulcollett.fsnet.co.uk. Thanks, Pcwires.
Mar 9, 2008. 6:33 PMbronx68
says:
I am looking to build a scrolling led display. Is yours a scrolling led display? If so are schematics, assembly code, kits available?
Mar 10, 2008. 12:29 PMpcwires
says:
Send me your email adr. My sign is scrolling have a look at the video on you tube.Click on the link in my previous comment.
Apr 21, 2008. 8:59 AMsayem ahmed
says:
I am doing this project. I am now working on hardware section. It is pretty easy. I am thinking about how I can add my massage in my sign. Is it in 256 eeprom build in 18f2550. One another problem is how can I cascade 10 74hc595. Is somebody complete this project. Please reply.
Apr 15, 2008. 6:44 AMsayem ahmed
says:
I would like to build the scrolling sign. How can I get details?I lke the USB LED scrolling marquee sign. I need a complete schematic of the scrolling marguee sign. Please send me the schematic as soon possible. Anybody help me. My mailing address is sayem72936@yahoo.com
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