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@Reinoud Have a look at post #2, section "Removal". Probably the vector fonts had to be removed due to space restrictions for your board.
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This fixed it, thank you @Gordon
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Search for "TP5000 module", ie this . Needs a solar panel with 4 to 7 V output.
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Here you go. 0b0001 and 0b0011 are approximations of the timings for logical 0 and 1 in the WS2812B/SK6812 spec sheets.
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Back in the days where there was no neopixel module we did this with send4bit(). I had no problems with RGBW led pixels. The pixels are SK6812 with three variants RGBNW (natural white), RGBCW (cold white) and RGBWW (warm white). I used them for a bike lights project. If you add plastic lenses to the chips, they get quite bright ;-)
Edit: there's a RGBW neopixel library at Adafruit.
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something like this: https://play.google.com/store/apps/details?id=iyok.com.blejoystick&hl=en_US&gl=US