Pages: 1 [2]   Go Down
Author Topic: Using a large number of distinct LED's  (Read 2353 times)
0 Members and 1 Guest are viewing this topic.
Global Moderator
Boston area, metrowest
Offline Offline
Brattain Member
*****
Karma: 533
Posts: 26943
Author of "Arduino for Teens". Available for Design & Build services. Now with Unlimited Eagle board sizes!
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

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.
Logged

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.

Global Moderator
Offline Offline
Brattain Member
*****
Karma: 480
Posts: 18722
Lua rocks!
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

"16 x Basic Stamp? Whoa"

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

To put my remark into context:

Logged


Cape Town South Africa
Offline Offline
Edison Member
*
Karma: 19
Posts: 1217
A newbie with loads of posts, and still so much to learn !
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

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 )

Logged

With my mobile phone I can call people and talk to them -  how smart can you get ?

Global Moderator
Boston area, metrowest
Offline Offline
Brattain Member
*****
Karma: 533
Posts: 26943
Author of "Arduino for Teens". Available for Design & Build services. Now with Unlimited Eagle board sizes!
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Seems you need to look into etching boards at home for future projects when your PCB suppliers are not available John.
Logged

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.

Pages: 1 [2]   Go Up
Jump to: