Notes from my own projects: microcontrollers and sensors, solar and heat pumps, and language models I build from scratch to understand them.
ChatGPT felt like magic, so I started building a tiny language model myself, following Andrej Karpathy's Zero to Hero course. How an LLM learns and writes, in plain words and animations: next-word prediction, gradients, training, attention and the full pipeline.
8 min read
A Vaillant aroTHERM has no button for using surplus solar. Here are five ways to add one, from time programs and SG Ready to Home Assistant, an ESP32 and eBUS, with the rules that protect the compressor.
8 min read
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.
9 min read
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.
9 min read