It only started malfunctioning in late June 2018, when I pulled the harness out of storage in the spare bedroom for the winter.
This year, just the software.
The v.1 FastLED Witch Lights were completed at the last second: the last commit date on GitHub for that build was submitted after midnight on July 2nd. The priority had been fixing memory leaks: the Witch Lights run for 6-9 hours on a single battery in warm weather, and a slow memory leak could cause them to crash in hour 4.
Fortunately, Jim is an excellent developer, and did in fact build an object-oriented animation framework for the Witch Lights gratis, so I owe him a perpetual debt of gratitude. (He also walked me through the class inheritance and the way the state machine sprites were configured and such when I began work on v.2 in spring of 2018. He's good people.)
Anyway, the way we drew the sprite at the time was, we loaded a static
CRGB struct into RAM, and then used
memcpy to update the
leds struct (also
CRGB which is like an array of 3-byte arrays, each containing an
B value) with a function called
(We did it that way because we draw the sprites 3 pixels off-strip, and having an abstracted function that we could feed a location of -3 without accidentally overwriting the bootloader—again—helped a lot.)
Anyway, we just moved pre-rendered sprites around for the
travel mode of the Sprite state machine. The idle animation of the time also was a set of pre-rendered animations loaded into RAM as series of
CRGB structs that got stepped through like animation frames.
We did that because this was the first time we were going to try animating more than one sprite at a time. We knew the Arduino Due was a significant upgrade from the Duemilanove the first builds of the software was tested on. We didn't, however, have a feel for what the processor capabilities were.
We only knew that v.1 ran for hours without crashing in 1K of SRAM while running a 30-pixel test strip on the 8-bit Duemilanove, and the Due had 96K to run 600-750 pixels. So we threw RAM at the first draft implementation.
insert animation comparison video
In the first half of this (over-long, but forgive me, it was done in 30 minutes before leaving for a trip) documentation video, you can see the result.
Here's a detail.