ArduPilot
Copter-4.5.0-beta2: Neopixel LEDs display incorrect colours
If multiple neopixel LEDs are connected they may show different colours from each other in 4.5.0 while in 4.4.4 they all show the same colour.
Below is a video using a CubeOrange with 3 neopixels connected. https://github.com/ArduPilot/ardupilot/assets/1498098/f0a9a517-1dc4-4099-85e6-80ee0af6d7d2
The Neopixels are connected to CubeOrangePlus's AUX OUT 1, powered from a 5V BEC
Related discussion is here.
@rmackay9 if you are using CubeOrange then you really need to use a pull-up on the output. I have had this discussion on and off with @bugobliterator. Not saying this is the issue, but CubeOrange is definitely special electrically.
https://discuss.cubepilot.org/t/rgb-neopixel-led-wiring-and-configuration/12129/8?u=sidbh Reference to the discussion where I answered this query.
The reason that NeoPixel LEDs don’t function on Cube is because they require > 0.7Vcc signal line, Aux pins put out 3.3V and generally power tends to be solid 5V. 0.75 = 3.5V Reference
If Neopixel are working without any modification, it is actually more of a cause of concern, as that indicates your 5V are not actually 5V but something like 4.7V, and possible symptom of this is brown-out on other hardware that require solid 5V for instance ESC or Autopilot power system etc...
I think it is more likely a slight change in clocking. I got the same symptoms (very similar flashing) on a G4 periph, and fixed it by overriding STM32_PPRE1 so we got a different peripheral clock on the timer
