Electronics and software

Notes from my own projects with microcontrollers, sensors and the code that runs them.

A LOLIN S3 Mini board: purple PCB with an ESP32-S3 chip, two rows of labelled pins and a USB-C port.

Heating with surplus solar: an ESP32 between a Huawei inverter and a Vaillant heat pump

How an ESP32 reads a Huawei SUN2000 over Modbus TCP and steers a Vaillant aroTHERM with a VRC 700 to use surplus solar, safely: registers, wiring, firmware, control rules and the pitfalls.

29 October 20269 min read

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How I turned an old Android phone into a home server (no root, no open ports)

A Samsung Galaxy S20+ with a broken screen now hosts this website: Termux, udocker, Next.js, PostgreSQL and a Cloudflare Tunnel, step by step, with the Android pitfalls that cost me the most time.

29 October 20269 min read

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Home energySolar, heat pumps and the controllers that make them work together.
ElectronicsMicrocontrollers, sensors and wiring.
SoftwareWeb development, tooling and the code behind the projects.

Electronics and software

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Heating with surplus solar: an ESP32 between a Huawei inverter and a Vaillant heat pump

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How I turned an old Android phone into a home server (no root, no open ports)

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