I'm posting this on the Software Support forum, though I'm expecting the answer *could* be power related. I have 88 WS2801s connected to a Pi3 via SPI and a level shifter. I'm running a HDMI splitter and utv007 capture which works fine. My PSU is 10A and although it also powers the Pi and HDMI splitter I *think* it's powerful enough. I'm supplying power at both ends of the strip. When I was previously supplying only 1 end, the LEDs gradually became slightly yellow-ish towards the end, but there's also always been a slight red tinge (on all LEDs) when display a full white picture. However the LEDs are stable - no flicker. If I change the color adjustment settings - whitelevel, gamma, etc, even by the smallest amount (when displaying the white picture) - all of the LEDs start to flicker wildly. Which seems wierd - if I reduce the red value on "whitelevel" for example, surely the LEDs require *less* power and so should remain stable? But I get the wild flickering. So this got me to thinking that it's not a power issue. But! I've found that if I set "Luminance gain" to 0.8 and therefore reduce the overall brightness, then I can adjust the color values without getting any flicker - which seems to point at a power issue! So I can live with the slightly red hue to the colors or reduce the brightness. I'm happy enough to run with 0.8 Luminance so this isn't really a big deal, but I'd love to understand what's causing the issue. Any suggestions?
Do you have a wiring diagram of how you wired it? I had the same flicker issue, had to put the level shifter real close to the first led (about 5cm), also put the power at the 4 middle points, and use a separate power supply for the pi, have about 230LEDs with 15a supply, no flicker. Crude wiring diagram uploaded.
Thanks for the diagram! So the one glaring difference with mine is that there's a few metres of cable between my levelshifter and the LEDs - I added the shifter explicitly so that I could have a longer cable length, but it guess it could be the issue. I'll remove the extra cabling and see if it makes a difference. I guess I should look at adding extra 5v cables too, it can't do any harm... though I'm measuring 5v (+/- a few percent) throughout the stip. Ha, that said I don't think I measured while the LEDs were at full white, so definitely worth re-measuring.
