LC7932....A 16 bit Bidirectional Shift Register...Here is a Place where you can

sam_sam_sam

Hi EveryOne

I just Bought two these 16 X 32 Dot Matix Led Display that has these LC7932 IC Chips in them

16X32 DOT MATRIX led display from “http://www.futurlec.com/Specials.shtml

I just want to know·if i can use them or am i going to have remove the displays and make my own board for them

Here is a link to the Data Sheet http://www.datasheetcatalog.com/datasheets_pdf/L/C/7/9/LC7932.shtml

I know about these post

http://forums.parallax.com/showthread.php?p=651690

http://forums.parallax.com/showthread.php?p=667572

http://forums.parallax.com/showthread.php?p=651690

What i want to know·is if someone has got this to work the way they wanted to work





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Sam

Post Edited (sam_sam_sam) : 9/26/2007 4:19:07 PM GMT

pwillard

The LC7932 has a few more options than the 74HC595, but it is basically the same and should be pretty simple to fill in the gaps (Like setting shift direction, setting BEO HIGh, etc).

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There's nothing like a new idea and a warm soldering iron.

Chris Savage

Sam,

Where are they sold? If there is a good price on them someplace where I am likely to order parts I may grab a few and write some example code. Take care.

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Chris Savage
Parallax Tech Support

sam_sam_sam

Chris

I did a search at Digikey and Mouser and no such luck in find these chips I will PM about this matter

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Sam

Newzed

Sam, have you found the LCDs yet?

Sid

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Yesterday is history, tomorrow is a mystery, and today is a gift.

That is why they call it the present.

Don't have VGA?
Newzed@aol.com
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sam_sam_sam

Sid

What we are looking for is a 16-Bit LED Driver chip number LC7932

The only places that has them you have a min $ 100.00 or more·to buy and i don not
want that many of them

I did a search at Digikey and Mouser and no such luck in find these chips

If some one knows of a place where you can buy·10 of· them so i can give five of them·to Chris to play with them that would work just fine

Thanks to any one that can help ahead time



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Sam

T&E Engineer

Sam,

I have given up on this one.··Unfortunately the LC7932's are tied together and I have explored this to about the extent I can take it. I spent alot of time on this and asked other engineers there thoughts about this.

As you stated earlier....

Here is the BS2 link (last post at the bottom):

http://forums.parallax.com/showthread.php?p=651690

Here is the SX28 link:

http://forums.parallax.com/showthread.php?p=658966

However,
I have found that the best method for me is to use P-FET's on the Anodes and A6821's on the Cathodes. Unfortunately P-FETS (2-10 Amps) are in surface mount form only so a special board will have to be made for them.

You can get free samples of the P channel FETs from Fairchild Semiconductor and the A6821's from Allegro Microsystems (free samples). You will put the current limiting resistors on the outputs of the A6821's. I am currently working on an LED display which is comprised of (5) 8x8 Bi-Colored LED Matrix modules (actually you can get 3 colors). The 8x8 BiColored LED Matrix modules are sold on Ebay for under $20 (including tax) for 10 of them. I will be posting my design in a couple more weeks when I get finished wiring it all together and write some code. I hope to have this working all from an SX-28. That's amazing. However, If I want to control individual 8x8 modules I will probably need to move up to an SX-48 because I will need more output lines to control the /OE lines of each A6821 to control what color the module is displaying (green, red or yellow). More to come...


Post Edited (T&E Engineer) : 9/19/2007 1:13:31 AM GMT

sam_sam_sam

·Chris··

I think i have found a placse to to buy 12 of them i am just waiting to find out
how to send the payment to them

I will let you if i can get them

I found out that these LC7932 chips they are longer being made

This is on Sanyo web page


T&E Engineer

Thank you for your reply

I will watching what you come with ......................................

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Sam

T&E Engineer

I may be interested in purchasing some of these LC7932 LED driver chips - especially if they are in DIP form and not so much SMT. Let us know if you can still aquire them.

In the mean time, if you have purchased the 16x32 display from Futurelec and have not tried out either the BS2 or SX-28 version - I invite you to do so.

These displays·really have a nice brightness to them. I have been searching everywhere for LED displays and can not find any. So for >$20 it's a great deal!

However, I can't remember the current drawn, but I beleive I used a higher current 5vdc power supply for the display LEDs as well as the standard 5vdc from my Parallax Professional Development Board (PDB) for the display·ICs and SX-28.

Good luck. Attached are the latest program versions.

sam_sam_sam

T&E Engineer


I will see if they can get more than 12 this all they show on hand

but i· will let you know now if you want to buy $100.00 or more i can
give a few web links to those if you want me to

Please let me know if you want to give them to you

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Sam

T&E Engineer

No, I will not spend $100 on components for hobby projects.

However, if you can get more from your supplier in reasonable low quanties like 3-10 or so·let me know.

I did look for them some time back and was unable to find them either.

Thanks for the good work on this.

sam_sam_sam

T&E Engineer


No, I will not spend $100 on components for hobby projects.


I know what you mean
I·do not like to send that much money·any one Project

But i have done it .....................................

I will see what i can do


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Sam

sam_sam_sam

T&E Engineer

Here is where you can buy the LC7932 chips

http://www.bdent.com/search/part.jsp?partnum=LC7932

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Sam

T&E Engineer

Sam,

I just ordered 3 of the 30 pin DIP (LC7932) versions. They were $7.32 each + $6.25 UPS ground shipping. I did not like how they did not tell you how much shipping was going to be till the end - so I chose GROUND shipping.

Thanks for the great find!

I will let you know what I can design with these.

sam_sam_sam

T&E Engineer


I just order 3 of them my self but·I took the $6.25 UPS ground shipping

They are out of stock for now·they will email me if they can get more of them

so if they can i will post it

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Sam

T&E Engineer

Hmm.

The screen says they are in stock. I did not get an email or screen warning stating mine were not in stock or delayed.

I'll let you all know. So far it should be scheduled to go out I'm assumming today or tomorrow (most likely).

sam_sam_sam

T&E Engineer

I call the company when i placed my·order·the sales person told me that some one had order 3 of them today

··I placed my order they are now out of stock i though that you may have been the one that had order some

Here is another link where you can find some the only problem they have a
Min of 25 of the same item $ 5.37 each which is about $130.00

http://www.tenfourltd.com/PartSearch.php

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Sam

Post Edited (sam_sam_sam) : 9/26/2007 8:32:15 PM GMT

T&E Engineer

I appologize but had no way of knowing that they only had 3 in stock and it sounded like a good number to have.

Let me know when they get more. I hope you can get some. However, I am not going to buy 25.

Sorry. This is weird and a bit ironic.

But I do greatly appreciate the lead.

PS: I just checked my email and I got a UPS notification that the chips were shipped and can expect them Friday (2 days) - not bad for ground shipping. But PA is not too far from KY.




Post Edited (T&E Engineer) : 9/26/2007 9:45:01 PM GMT

sam_sam_sam

T&E Engineer

You do not need to appologize

I just order 3 of them my self

When i fond them i was on break at work and only had time to post the link so i am glad that you where able to order some

I was going to order 6 all together but that alright if they can get them i may even find more of them some where else if not


This is weird and a bit ironic. Yes it is I have look at alot of comany web sites
and never seen where you had to order 25 of the same item and yet have a break down 0 to 5 for a price 6 to 10 for a price and so on and tell you that
you have buy 25 of the same item and tell· you that there min is $50.00

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Sam

Post Edited (sam_sam_sam) : 9/27/2007 5:38:02 PM GMT

T&E Engineer

SAM,

I got my (3) LC7932 LED drivers today. BUT there is a problem. I ordered the DIP style versus the surface mount type. I assumed it was like most all DIPs that I have used being 0.1" between pins. However THEY ARE NOT. They do not fit into a solderless breadboard like I expected. They are 1.79 mm appart not 0.1" appart between the pins. 30 pins·fairly·close together. I still may be able to rig up a board to mount them on a solderless breadboard but certainly they wont fit into a standard 0.1" socket either. This sucks for me and maybe you too.

sam_sam_sam

T&E Engineer

However THEY ARE NOT. They do not fit into a solderless breadboard like I expected. They are 1.79 mm appart not 0.1" appart between the pins. 30 pins·fairly·close together. I still may be able to rig up a board to mount them on a solderless breadboard but certainly they wont fit into a standard 0.1" socket either. This sucks for me and maybe you too.

If you are going to make a board to use these chips and the led displays

Please let me know and i will go half the cost to have a board made to use them

Yes this sucks they do not make thing easy do they


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Sam

T&E Engineer

What I was able to find out was not much. The LC7932 uses a DIP30S package. But I'm still not sure if it is 3061-DIP30S or DIP30S. There is nothing on the internet about the DIP30S except 1 Sanyo datasheet all in Japanese and somewhat short so probably not much information. I also saw reference to a 29T27 adapter which may or may not be correct. No information at all found about this.

Due to the lack of availability. Yes I checked most of my part sources - nothing on this DIP30S socket.... I think what I will do is simply and carefully solder short wires (22 gauge? or smaller) to each pin and use it that way on a solderless breadboard. It seems to be the easiest and at this point (only) way to use this chip.

Does anyone know about this DIP30S package by Sanyo and where a socket or an adapter can be purchased?

I will let you know of my progress and probably take some pics if you want to see it when done later tonight or tomorrow.

What a pain this has been.

T&E Engineer

Here is what I did to make an adapter:

Parts: Small perf board (Radio Shack), 2 sets of 15 male 0.1" headers (parts store - Jameco, Mouser, etc.), 30 gauge insulated wraping wire (Radio Shack 278-501,2 or 3), 15w soldering iron and a new 15w tip (Radio Shack), small rosin core solder (Radio Shack 64-013 or something), 22 gauge solid (Radio Shack - comes in a 3 pack or whatever), very small needle nose pliers and cutters.

1. Cut the bottom 30 thin leads off of the LC7932 (leave only the upper·wider part).

2. Get 2 sets of male 0.1" headers of 15 each and push a short piece of 22 gauge wire into each one and solder. Cut to about a 1/2" afterwards.

3. Insert the 2 male headers into the perf board and make enough room for the LC7932 to fit.

4. Carefully start pre-tining each wide lead on the LC7932 and cut 30 1-2" 30 gauge wires and solder closely to each wide lead.

5. Trim back each of the 30 wires coming off of the LC7932 to about 1/2" total length.

6. Bend back the 22 guage wire posts out from the perfboard top back to the outside.

7. Use the needle nose pliers and strip off a 1/32" off of each end and carefull solder the wires to each of the posts.

8. Check every wire and connection to make sure non are touching eachother and push down carefully the LC7932 to rest on top of the perf board.



Here are some pics I took of the adapter. As you can see the last pic shows the original bottom side of the AD-501-B 16x32 LED display. It shows the comparison of the surface mounted LC7932M to the DIP30S LC7932 in the custom adapter I made.

I burned a couple of fingers on my soldering iron grabbing it and putting it back down so many times - so have plenty of ice water too! lol.

Time for a break. Total project time ~2 hours.

Franklin

www.sourceresearch.com/Store1/quickstore.cfm?ProductID=54461&do=detail

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- Stephen

sam_sam_sam

T&E Engineer

Thanks for sharing what·you did here

Here is what I did to make an adapter:

Thanks for sharing the photos of what and how you did it



I burned a couple of fingers on my soldering iron grabbing it and putting it back down so many times - so have plenty of ice water too! lol.

I know what you mean i have done this a few times my self·

Keep up the good work and keep us post on it come along



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Sam

T&E Engineer

Franklin,

Thanks so much for the source on the DIP30S sockets. I had a difficult time finding them. I will probably order some (5 min) this week.

I have a couple of other projects going on too so I will have to multi-task myself as I can.

Thanks again!

sam_sam_sam

T&E Engineer

When you order them you have to order $25.00 or more or·else·there is a $5.00 add charges for orders under $25.00 but you do not see this until you check out

So i order 5 of the· DIP30S sockets

·And 2 ic Chips from them as well





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Sam

sam_sam_sam

T&E Engineer

When you order them you have to order $25.00 or more or·else·there is a $5.00 add charges for orders under $25.00 but you do not see this until you check out

So i order 5 of the· DIP30S sockets



They are out of stock·on the·DIP30S sockets and could not tell me when they will get them in but they said that they will email when they get them in

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Sam

kelvin james

Try this for the socket, they may have others that are cheaper.

www.digikey.com/scripts/us/dksus.dll?Detail?name=ED90224-ND

sam_sam_sam

kelvin james


Thanks for the Link

I did not know that they carry them

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Sam

David H.

I was reading your listings, and all I found for you were sockets that might work for you. All it would help is allow you to replace the chip in your adapter.
Part numbers at Digi-Key are ED22304-ND & ED90224-ND. They are 30 position at a .07" pitch, and the rows are .4" apart. If you are still looking, hope this helps.
Mr.Clyde

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David


There are 10 types of people in this world,...
Those that understand binary numbers, and those that don't!!!