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The HSL value of the complementary colour is now in $h2, $s, $l. So we're ready to convert this back to RGB (again, my PHP version of the EasyRGB.com formula). Note the input and output formats are different this time, see my comments at the top of the code: // Input is HS...
The DotStar (APA102) is an RGB LED in a small 5050 package that incorporates a microcontroller so you control the colour and brightness using a two-wire SPI signal. You can also daisy-chain a virtually unlimited number of them together, with individual control over the colour and brightness ...
Not macht erfinderisch! Necessity is the mother of invention! I see it this way: entering into the work on ESP32 has pointed out these necessities... may be in the end we just have to be ralistic and say: it is not the tool or means for this application... and nothing is wrong...