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 Post subject: Multiple controlers for large array
PostPosted: Fri Jul 08, 2011 12:11 am 
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I am new to microcontrolers. I would like to design a control for a large array of LEDs which will have many more control points than I can get from a single microcontroler. Is it possible control one micro from another in a master/slave relationship to double the number of I/O pins that I can control?

Thank you for your time.

=Wadley


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 Post subject: Re: Multiple controlers for large array
PostPosted: Fri Jul 08, 2011 1:14 am 
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use LED driver chips. Or multiplex them.

Alan KM6VV

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 Post subject: Re: Multiple controlers for large array
PostPosted: Fri Jul 08, 2011 6:57 pm 
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Use the TLC5940 from TI or one of their varients. They are designed to drive 16 LEDs but you can mux them 8:1, 16:1 or even 32:1(I've done it) and get good results. Its not a simple project by any means but it was fun. We are planning on open sourcing our designs for the LED driver board we did a while ago but I'm not sure how long it will take to get that up on the website(don't exepect it real soon since we are swammped at the moment). We used 6 TLC5940 chips, an AtomPro 64IC chip and some shift registers for row selection to run 1000 RGB leds with a 72hz refresh rate(eg no noticable flicker).

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 Post subject: Re: Multiple controlers for large array
PostPosted: Fri Jul 08, 2011 10:03 pm 
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Impressive!

Yes, the TI chip was one of the ones I was thinking of. ON has the CAT4109-D, TI has the TLC5946 that we use.

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 Post subject: Re: Multiple controlers for large array
PostPosted: Sat Jul 09, 2011 11:13 pm 
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Acidtech wrote:
Use the TLC5940 from TI or one of their varients. They are designed to drive 16 LEDs but you can mux them 8:1, 16:1 or even 32:1(I've done it) and get good results. Its not a simple project by any means but it was fun. We are planning on open sourcing our designs for the LED driver board we did a while ago but I'm not sure how long it will take to get that up on the website(don't exepect it real soon since we are swammped at the moment). We used 6 TLC5940 chips, an AtomPro 64IC chip and some shift registers for row selection to run 1000 RGB leds with a 72hz refresh rate(eg no noticable flicker).


Thank you for the info. This is the sort of thing I was looking for. Knowing that it has been done already makes me a little more confident that I will be able to find a similar method.

W


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