Journal

The things you find out when you open the case.

Experiments, discoveries, and the occasional detour. These are the longer notes from my workbench, collected in one place.

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Reverse engineering

Following the signals, decoding the protocols, making things talk.

Taking control of the Resideo thermostat

Tracing OAuth, mapping the API, and bringing the Lyric T6 into Home Assistant.

Getting the Govee pool thermometer talking

Following the H5109 from its 433 MHz radio link to a cloud API and Home Assistant.

Inside the Gulfstream Compass WiFi API

From an Android app to a working Home Assistant integration for a pool heat pump.

Vintage computing

Old systems still have plenty to teach us.

Dissecting the HDOS Diskette

Inside a Heath diskette: sectors, directories, and the structures that hold everything together.