ITOHI — Open-Source Hardware, Embedded Systems & DIY Builds

ELRS telemetry ratio, CRSF frame round-robin and the EdgeTX log period sit in series. Why the arithmetic is not the answer, how to get the real per-sensor rate out of your own CSV, and the 3D viewer I built to read it.

The battery ladder, the satellite callouts, and an altitude alarm that fires on change rather than absolute height. Including the self-test I like most and the delta function I did not plan.

How EdgeTX customisable function switches, an RGB colour per subsystem, and one AND slot per logical switch turn eleven threshold detectors into three things you can switch on and off.

A low-battery number in the corner of the OSD is an interface failure, not a pilot failure. Why I made my RadioMaster GX12 speak, and the one flight-controller setting the whole thing depends on.

Craft name Snake. It started life as a Meteor75 Pro, and it is now a Meteor75 Pro II — frame and canopy ordered off AliExpress, everything expensive carried straight over. Same Matrix 1S 3-in-1 FC. Same narrow-FOV DJI O4 air unit. New shell, old guts, and by the time I was done, 169 flights and 15,574 seconds of logs …

With the spectrometer alignment sorted and PySpectrometer3 taking shape, the obvious next experiment was UV fluorescence. Minerals, biological samples, gemstones — a lot of interesting chemistry shows up as emission spectra under UV excitation that you'd never see under white light. The setup is conceptually simple: …

Still trying to solve the monitor calibration problem — need to measure the actual spectral output of my monitor's primaries, not just RGB. The CR30 held against the screen gives something, but it's not designed for emissive sources. What I need is the pocket jewel spectroscope I've been using all along, properly …