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Topic: Using a large number of distinct LED's (Read 3026 times) previous topic - next topic

CrossRoads

The 2x WS2803 will control the 36 cathodes for you with PWM control on each for fading & color mixing.  No transistors needed.
Couple dollars each from guys out by Niagara Falls
http://www.ebay.com/itm/5pc-Worldsemi-WS2803D-18-Channel-RGB-Constant-Current-LED-Driver-DIP-WS2803-PWM-/150694768407?pt=LH_DefaultDomain_0&hash=item23161baf17
Then look at WS2801 library for controlling them.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

Nick Gammon


"16 x Basic Stamp? Whoa"

That's why I like doing projects like this. Hearing people say that.


To put my remark into context:

http://www.youtube.com/watch?v=wQ5iFQv1KaE
Please post technical questions on the forum, not by personal message. Thanks!

More info:
http://www.gammon.com.au/electronics

Boffin1

For my sins , I am making some prototype displays that use 840 LEDs each.

Because of availablilty here, I am using SAA 1064 chips that can drive 16 LEDs at a time latched, or 32 at 50% multiplexed.

For the proto I am wiring by hand :-(  but later ones will have a pcb.

Its I2C driven and has 4 addresses, so you can have 128 LEDs driven by 4 chips from 2 pins of the Arduino .

I am using 7x5 matrix displays, but you can change any LEDs as you wish.

Heres a shot of whats been keeping me busy this holiday season .
This is for one of the chips ( which havnt arrived yet, hence the socket )


CrossRoads

Seems you need to look into etching boards at home for future projects when your PCB suppliers are not available John.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

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