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Topic: 6 digit 7 Segment display - TPIC6B595 schematic component? (Read 6 times) previous topic - next topic

johnhuebbe

Hi all.  First off, an introduction.  I'm John Huebbe... new to electronics but experienced with programming.  Just picked up an Arduino and some components a week ago.  So far, so good with simple projects (LEDs, speaker, push buttons, small 7 segment display).

I'm building a large (2 to 5 inch high numbers) 6 digit 7 segment display.  Some background info... I already have my code working while using the embedded-lab SPI7SEGDISP8.56 MAX7219 based serial 8-digit seven segment LED display module  http://embedded-lab.com/blog/?p=6943  (took me longer to solder up than program)

From reading a ton of forum posts (most where CrossRoads has replied) it looks like it would be best not to use the MAX7219 to drive larger displays and I think it best to use the TPIC6B595 to drive them.  Right? 

So, I'm trying to come up with a basic schematic using the ExpressSCH software, but I don't see a TPIC6B595 component.  I already tried searching but couldn't find a component to download.  Does anyone already have this made?  Or, have I missed seeing it in the software?

Also, does anyone already have a schematic drawn up using these?

CrossRoads

#1
Mar 06, 2013, 05:00 pm Last Edit: Mar 06, 2013, 05:38 pm by CrossRoads Reason: 1
TPIC6B595 is good for driving  higher voltage displays,  where 10-12V is needed to drive 3-4-5 LEDs/segment.
With ExpressSCH is dirt simple to make your own component.
Highlight an existing component, use the menu commands to ungroup it, revise as needed, then select all to regroup and save as a custom component.
I can send you my TPIC6B595 symbol when I get home.  Send me a PM after 5:00PM east coast time as a reminder.
I've posted schematics showing that part as well.  Are you multiplexing the digits, or just using 1/digit?
This board I offer ($6 for bare board) can drive up to 12 digits seperately.  I'm also using it in another project to multiplex 56 digits (altho less brightly due to the multiplexing).
http://www.crossroadsfencing.com/BobuinoRev17/

Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

johnhuebbe

#2
Mar 06, 2013, 05:23 pm Last Edit: Mar 06, 2013, 05:26 pm by johnhuebbe Reason: 1
I haven't really decided on a specific 7 segment display yet, but most of the larger displays I see are 7-12 volt.  I'm not really set on a certain type or size just yet.

So far I've seen displays like this one:
http://www.ebay.com/itm/4-inch-7-segment-RED-LED-display-common-anode-1pcs-/360608554918?pt=LH_DefaultDomain_0&hash=item53f5f1dfa6
Voltage:10V~12V  Current:160mA

But maybe eBay isn't the best choice?  I don't see many specs on that display (like brightness).  I want a bright display for outdoor viewing in the sun.

I've seen some other displays on Digikey
http://www.digikey.com/product-detail/en/LDS-AD16RI/67-1493-ND/253656
6.8V  10mA

or

Mouser
http://www.mouser.com/ProductDetail/Lumex/LDS-AD14RI/?qs=sGAEpiMZZMvkC18yXH9iIodCS3EcCJg%2fvIF5cWbQeXU%3d
8V 30mA

I've also seen some that are only 1.85V 30mA (although not in stock)
http://www.mouser.com/ProductDetail/Kingbright/SA23-11SRWA/?qs=sGAEpiMZZMvkC18yXH9iIgvC7dgeX7B5331BdgRjLvY%3d

So far, I've been working on a small prototype on my breadboard.  Once I get the software to work how I want it, then I'll start making a full size version.  I've been trying to read a lot and see what others have done before, but lots of projects look to be unique.  Just trying to figure out all of the different options out there for what will work best for me. Daunting task for a non-electronics guy.

I'll PM you later for the component for expressPCB software.  Thanks!
(I'm still amazed at how easy it is to program something on the Arduino and have it do things. Never thought it would be this easy.)

CrossRoads

#3
Mar 06, 2013, 05:57 pm Last Edit: Mar 06, 2013, 05:59 pm by CrossRoads Reason: 1
try kingbrightusa.com too, example
http://www.kingbrightusa.com/category.asp?catalog%5Fname=LED&category%5Fname=KC1%2DDigit+4%2E0in&Page=1

Or make your own digits, chunks of LED strip lights for each segment.
The digikey/mouser parts are faint, only 10s of mCD.  You need much more for outdoor use:
http://www.dipmicro.com/store/LED5B
http://www.dipmicro.com/store/LED5G
http://www.dipmicro.com/store/LED5W
These will show up nice!

Yes, Arduino pretty easy to use. Programming seems like fancy BASIC to me.  But then again, I've been exposed to a lot of different software over the years. Biggest challenge to the coding was keeping the ; and { } straight when I started with Arduino.  Gets easier the more you do it.
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

johnhuebbe

Thanks for the links.

Do you have any suggestions on the mCD output needed for a display to be visible outdoors?

I'm not opposed to making my own LED digits, kind of like this http://www.ebay.com/itm/LARGE-5-127mm-TALL-BI-COLOR-LED-7-SEGMENT-DISPLAY-100-USA-BUILT-/321036681257?pt=LH_DefaultDomain_0&hash=item4abf470029

Only reservations would be soldering up all of those LEDs onto boards for 6 digits.  Plus, I'd have to make a custom board (unless you know of boards available for purchase)

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