2021-03-01 19:35:23 +01:00
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# WS2812B light signal - CPU Board
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2021-03-02 19:34:09 +01:00
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Board to run [colorchord2](https://github.com/cnlohr/colorchord) on a string of WS2812B LEDs with live line-in audio.
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## Errata (Rev 01)
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* Opamp inverting / non-inverting inputs are swapped
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* Workaround: Lift pads 2 and 3, and 5 and 6, and connect them crossed using magnet wire.
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* Opamp is not rail-to-rail and does not allow to use the ADC in full range
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* Workaround: Only use limited range -640 to 520.
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* LED footprint is wrong.
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* Workaround: Flip 180 degrees and solder shifted onto the right pads, then use magnet wire to connect the remaining two pads.
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* Serial boot loader non-functional (uses incompatible UART I/Os).
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* Workaround: Program via JTAG / SWD.
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2021-07-17 23:07:20 +02:00
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* Missing level shifters for WS2812B LEDs (RX)
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* Workaround: Don't use WS2812B RX inputs on the board
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* Missing level shifters for WS2812B LEDs (TX)
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* Workaround: The first LED will kinda sorta do the level shifting for you, but sometimes fail to display correctly. Just ignore its erratic blinking.
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