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TrueFuse 2F: Measuring the Port Instead of Trusting It

The third part of the altitude fusion filter behind AltimeterCloud. A port coefficient measured rather than assumed, a slew witness taught to look both ways, an ejection charge that reads the wrong way up, and the same law ported into two firmwares that could not be built more differently.

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TrueFuse 2E: What Two Hundred Flights Taught Our Altimeter Fusion Filter

In August we explained why a barometer lies during a rocket flight and how TrueFuse 2C referees between it and the accelerometer. This is what happened next: two hundred and one real flights run through every candidate change, a new witness for the small ejection notches the old filter followed, a burnout stamp that has to earn belief, several ideas that did not survive the evidence, and a port to the Nano tested blind against the website to the millimetre.

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Altimeter code: Page 1, introduction to DIY rocket altimeters

The Mercury V1 is the one altimeter we leave unlocked on purpose, so you can put your own code on it. Part one takes you from a bare Arduino IDE to a working barometric altimeter that prints pressure, temperature and height five times a second, and turns its LED blue when you lift it off the desk. No programming experience needed.

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Setting up the Arduino IDE for ESP32-S2, S3 and C6

Getting the Arduino IDE talking to an ESP32 is more fiddly than it looks, and most of the trouble comes from a handful of board settings rather than the install itself. This guide covers the whole process for the S2, S3 and C6, including the ones that catch everybody out.

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