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| History of Addressable LEDs |
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| Scottie:
--- Quote from: eti on December 09, 2021, 10:37:18 am ---All LEDs are addressable. How do you think the manufacturers get them to the wholesalers? 😛 --- End quote --- This is true! I'm not sure what the most accurate title would be "WS2812B is a intelligent control LED light source"... I do like the adafruit "Neo Pixel" term though. Worldsemi can send me all the LEDs! :) |
| mikeselectricstuff:
--- Quote from: Scottie on December 09, 2021, 12:50:31 am ---I really wasn't sure what products were available at that time. The article you discovered links to "icolor flex sl" which appears to be very similar to what we now know as a ws281x or "Neo Pixel". Each programable RGB pixel was (1.6 cm x 1.6 cm x 1.9 cm) spaced every 4 or 12 inches connected with a three-wire 18 AWG cable. --- End quote --- The Color flex and other proucts use a chip which Color Kinetics developed called "Chromasic". Similar to WS2812 but actually done properly - more colour depth, nicer protocol. Many years ago I reversed the protocol, as their PSU/drivers were expensive and mechanically ugly. https://www.docs.colorkinetics.com/support/datasheets/Chromasic1.pdf |
| Scottie:
Interesting, in the Color Kinetics patent, they describe striping off the first N data bytes just like the ws281x: --- Quote ---In this embodiment, each controller 26A, 26B, and 26C is programmed to receive data via the input terminal 32A of the data port 32, “strip off” an initial portion of the received data based on the number of output ports supported by the controller, and then transmit the remainder of the received data, if any, via the output terminal 32B of the data port 32. Accordingly, in this embodiment, the controller 26A receives the data sequence 60 from the processor 22 via the data link 28A, strips off the first portion 62 of the three bytes B1-B3 from the sequence 60, and uses this portion of the data to control its three output ports. The controller 26A then transmits the remainder of the data sequence, including the second and third portions 64 and 66, respectively, to the controller 26B via the data link 28B. --- End quote --- They also employed pulse width coded signaling, and reference 1/4 and 3/4 of a bit times for high/low states: --- Quote ---In another embodiment, a given lighting system 102 may receive data coded with a code, wherein pulses of less than ½ of a pulse period correspond to a first logical state, while pulses of more than ½ of a pulse period correspond to a second logical state. --- End quote --- |
| themadhippy:
What surprised me most is Color Kinetics didnt try and sue the inventors of other addressable leds --- Quote ---FreeStyler is an example of a free software. --- End quote --- And if you want something real lampies use to light everything from the local junior school play to international artists in a stadium https://chamsyslighting.com/products/magicq?variant=7841688715300 |
| Ice-Tea:
At some point in the historyof addressable LEDs I think this has a place: https://www.barco.com/en/News/Press-releases/u2-vertigo-tour-a-feast-for-the-eyes-with-revolutionary-barco-technology.aspx |
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