24 fps costs about 11% of one core on a Zero 2 W, measured on the board. That
is a reasonable default for something you look at, but it is a decorative load
sharing a 512 MB machine with the forecaster, so it should be the owner's
choice. server.led_fps is clamped to 4..30.
Particle fall speed now divides by the configured rate rather than the module
constant, so rain falls at the same real-world speed whatever the frame rate,
instead of slowing down when you turn the frame rate down.
The old display drew static glyphs, held them, and cut to the next, which looks
like a microwave clock. This is a continuous 24 fps renderer.
Three things do most of the work. Gamma, because LED duty cycle is linear and
perception is not, so ungamma'd gradients band and dim colours vanish.
Sub-pixel rendering, so a dot at x=3.4 lights two pixels and motion glides
rather than steps. Crossfades, so scenes dissolve over 1.3 s and nothing ever
cuts.
Added temporal dithering after finding the framebuffer is RGB565: 32 levels of
red and blue, which after gamma leaves very few steps exactly where an aurora
and a star field live. A Bayer pattern rotated each frame alternates between
adjacent hardware levels, measured landing on 1.75, 4.31 and 8.06 where the
panel can only display integers. The panel is also dimmed by measured lux on a
log curve, so at night it is a glow rather than a searchlight.
Five scenes, each a reading rather than decoration. Aurora: hue is temperature,
curtain drift direction is pressure tendency, contrast is humidity. Solar sky:
sun at its true azimuth and elevation over a dawn/day/dusk gradient, becoming a
twinkling star field and moon after sunset. Precipitation: drop count from rain
probability, snow below 1.5 C with sideways sway, lightning with exponential
afterglow when stormy. Forecast ribbon: six horizons scrolling, height is the
predicted delta, pale caps are the conformal half-width so uncertainty is
visible. Barometer: a breathing ring whose period is the tendency.
Profiled because it shares a 512 MB board with the station. The first ribbon
cost 330 us a frame, about 16% of a core scaled to a Zero 2 W; vectorising it
into fields rather than 84 sub-pixel splats brought the worst scene to 7.6%.
Verified 23.6 fps sustained with zero malformed frames.
kemal