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WS2812 Datasheet(PDF) 82 Page - Raspberry Pi Holdings PLC |
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WS2812 Datasheet(HTML) 82 Page - Raspberry Pi Holdings PLC |
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82 / 98 page  bit first. The data for pixel #0 (nearest the microcontroller) is issued first, then pixel #1, and so forth to the furthest pixel. This does not operate like a traditional shift register! After all the color data is sent, the data line must be held low for a minimum of 50 microseconds for the new colors to “latch.” You may want to dig through our Arduino library (https://adafru.it/aZU) for insights. The timing-critial parts are written in AVR assembly language, but it’s extensively commented with C-like pseudocode. My Microcontroller Isn’t Fast Enough to Do That The WS2812 appears to be backwardly-compatible with the 400 KHz WS2811 signal. If you can precisely match the latter chip’s timing, either type will respond. The WS2811 protocol is not simply a half-speed WS2812. The duty cycle for the “0” and “1” bits is slightly different. From the WS2811 datasheet (https://adafru.it/cDS): © Adafruit Industries https://learn.adafruit.com/adafruit-neopixel-uberguide Page 85 of 101 |
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