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RobG

[Group Buy-10] [O] RGB SMD LED (with built-in controller)

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I will be ordering more than 100 of the 5050 RGB LEDs with built-in WS2811 controller and want to see if anyone else would be interested in a GB.

WS2811 is a 3 channel, one wire, 8 bit/256 levels per channel PWM, constant current LED driver.

The great thing about this LED is that it requires no additional parts (except for bypass capacitor) and only one wire to control, so you can have an RGB LED on your board and you don't have to deal with resistors, transistors, etc.

Serial output allows daisy chaining of multiple LEDs.

 

I am planning to use it on a 4" x 4", 8 x 8 and 2" x 2", 4 x 4 RGB LED matrix boards and some other boards as an indicator.

 

If we buy < 200pcs, the price is $0.42 + local shipping.

200-299, $0.32

300-399, $0.30

400+, $0.28

 

post-197-135135569447_thumb.jpg

 

EDIT: Changed title to match group buy format - GeekDoc

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I can probably get you guys closer to 400 by ordering some for the store if that is ok. I can also take on shipping duties if Rob ships to me. ( of course no gb fee.) I can now do International orders at home, instead of going to the PO.

 

How about the WS2811 driver?

 

Member Name --------------------|Quantity--|US/INTL
RobG                            | 100+     | US
GeekDoc                         | 100      | US
Rickta59                        | 50       | US
oPossum                         | 35       | US
Bluehash                        | 100      | US

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Wow!

A little change in the plan.

I figured it will be cheaper and simpler just to get ready strip. The strip has 60 LEDs/m and costs ~$15/m, that means the LEDs are $0.25. For matrix, the strip can be cut in pieces, which will save on PCB and assembly time, and for the single part use, they can just be desoldered from the strip.

However, the guy who sold me 30 LED/m strips also offered me a much cheaper LEDs, <$0.20/pcs.

That said, I will still continue with this GB, but if you are planning on building a matrix, consider getting a strip.

 

Yes, that's it.

 

post-197-135135569451_thumb.jpg

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The nice looking thing about the tape version, the spacing between the leds is big enough that you can WEAVE strips between them. Might be a fairly complicated way of controlling them though.

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I think I'd prefer the strips, but I'd be happy either way.

 

I'm in for 100 loose, or 2 meters of strip, or (even better) 50 loose AND 1 meter of strip. :D

 

Member Name --------------------|Quantity--|US/INTL
RobG                            | 100+     | US
GeekDoc                         | 100/2m   | US
Rickta59                        | 50       | US
oPossum                         | 35       | US
Bluehash                        | 100      | US

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...Might be a fairly complicated way of controlling them though.

It's just a matter of proper timing. In low speed, zero is 0.5us/2.0us(H/L,) one is 1.2us/1.3us, and reset is 50us+. In high speed, pulses are 50% shorter (except reset.)

To get the perfec timing, the control function will have to be written in asm and should be called from ISR (or in main with disabled interrupts.) It takes 60us to update one LED, 960us to update 16 LED array.

My matrix for example will have 150 LEDs (10 x 15,) that's 450 RGB bytes, 3600 bits x 2.5us, 9ms total time to send all data. @24fps, that will give me ~24ms to massage my data. Those numbers are for low speed BTW.

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Well, I mean the woven method would mean it isn't a standard x*y matrix. Every other pixel would be connected to a different column. It's hard to describe, ill make a picture.

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Anyone got a datasheet? How bright are they compared to others (OSRAM, KingBright, whatever...)? I would also be in for GB when i have more information - might be an alternative for the TLC 5940 and my AmbiLight-Project ;)

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