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Topic: LED RGB 64-control individually (Read 14 times) previous topic - next topic

Omnimusha

Hi, I need to individually control 64 RGB LED, intensity, on / off and range or palette the colors

I have sought information and I met this 16-channel Multiplexer 74HC4067.

  74hc4067 Multiplexer, I allow only the ignition internal / off the LEDs? Will I be able to just change the color scheme?, or will I need also the ULN2803, to change the color palette?

coneciones my diagram here, do me a favor and put two hechele a mirada.solo 74hc4067 Multiplexer for the case
The procedure is repeated.





CrossRoads

Look at TLC5940, 16 channel (so 5 RGB LEDs)
http://www.ti.com/product/tlc5940
Can do the color pallette with individual control of PWM per channel.
Another option is WS2803, an 18 channel driver with PWM control per channel.
Possible link to datasheet:
www.world-semi.com/en/Driver/Lighting_LED_driver.../WS2803/
and a forum discussion
http://arduino.cc/forum/index.php/topic,89104.0.html

I think you can find Arduino libraries for each.
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.

Riva

I would also suggest the WS2803, on eBay you can pick them up for a little over a pound ($1.50) each in small quantities and even less for larger 25+ numbers. They work well and daisy chain together without problem.

Omnimusha

thanks for your help.
that the difference between the WS2803 and WS2801?
I can not find info on how to connect in cascade.

  the WS2801 to sparkfun is at $ 0.75 dollars.https://www.sparkfun.com/products/10444
library as well as for the WS2803 and WS2801. https://github.com/adafruit/Adafruit-WS2801-Library

Riva

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that the difference between the WS2803 and WS2801?

The WS2801 is only 3 channels per chip (1 RGB LED per chip) and the WS2803 is 18 channels (6 RGB LED's per chip).

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I can not find info on how to connect in cascade.

Connect arduino to SDI & CKI of first chip then just connect SDO & CKO of this chip to SDI & CKI of next chip and so on.

Omnimusha

the library is prepared for working with cascading chip?, if so what would be the limit of the library?

Grumpy_Mike

64 RGB LEDs is like 192 LEDs, so you need a lot to drive that. It would take 12 TLC5940 chips, that is a lot for a beginner to get working.
A cheaper alternative might be to use shift registers, look at this:-
http://www.elcojacobs.com/shiftpwm/
You will need three resistors for each RGB LED so that is 192 resistors as well.

funkyguy4000

If you are experienced enough, you could work with the AS1130 from Austrian Microsystems.  You will need two of them and they operate on I2C.
They can PWM 132 leds each.  Whabam
Accelerate to 88 miles per hour.

CrossRoads

Got a link to the AS1130 funkyguy?
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.

Grumpy_Mike

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They can PWM 132 leds each.  Whabam

They charlyplex and so they can not be used with RGB LEDs unless each LED has a separate anode and cathode, which is not very common and unknown outside surface mount devices.

funkyguy4000

Accelerate to 88 miles per hour.

Omnimusha




funkyguy4000

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lol.


I don't quite get what is funny...
Accelerate to 88 miles per hour.

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