Archive for March 14th, 2017
SK2812 in the title and elsewhere should be
SK6812. If I change the title, then all the other links break. So it goes.]
An envelope of RGBW LEDs, allegedly with SK6812 controllers, arrived from halfway around the planet:
The yellow phosphor sauce poured atop the blue LED on the left that makes it glow white leaves the upper loop of two wire bonds sticking out, but I can’t fault ’em for that. The overall build quality looks better than the ill-fated WS2812 LEDs, although it’s hard to tell by looking.
I conjured a test stand from the vasty digital deep by tweaking the WS2812 mount:
Wiring up a 5×5 panel went as before:
The array test code adds another pixel channel and runs another raised sine wave with another random period, accomplished without much hackage.
With the warm-white LED at full throttle (
MaxPWM = 255), the panel tends toward the pallid end of HSV space:
Dialing the white
MaxPWM back to 32 crisps things a bit:
Of course, the RGBW data stream isn’t compatible with the RGB data stream, so vacuum tubes with SK6812 chips require a slightly different driver and I can’t mix the two chips on a single tube.
The Arduino source code as a GitHub Gist: