Become a sponsor to Antoine Lépée

👋 Hi, I'm Antoine

I'm an AI Engineer with 15+ years of engineering behind me (front-end, back-end,
data, infra, and a few years as an Engineering Manager). My day job is building
tooling for coding agents. My open source work is somewhere else entirely: making
closed hardware talk.

🔥 What I maintain

hass-hitachi_yutaki is a Home
Assistant integration for Hitachi Yutaki and Yutampo heat pumps, over Modbus.
It is not just another register bridge. The point is to turn a black box into a
machine its owner can actually diagnose:

• Real COP, per usage (heating, cooling, DHW, pool), computed by energy
  accumulation rather than instant readings, with an explicit quality attribute.
• Thermal energy, heating and cooling tracked separately, with defrost cycles
  filtered out so your counters stay honest.
• Early fault detection: refrigerant drift today, hydraulic degradation and
  short cycling next. Each detector is validated against real, anonymous,
  opt-in fleet data before it ships.
• Seven auto-detected machine profiles, so you don't get ghost entities for
  sensors your unit doesn't have.

Alongside it: hass-heating_cooling_degree_days,
a small integration that tracks heating and cooling degree days, to put your
consumption in context of the weather you actually had.

🧱 Why this needs support

I'm the sole maintainer, and this work has real costs:

• Hardware. Manufacturer Modbus gateways are expensive and hard to source.
  Supporting a model I don't own means buying into it, or relying on the patience
  of a user willing to test in production on their own heating system.
• Infrastructure. The opt-in telemetry backend (a Cloudflare Worker feeding
  object storage and analytics) is what lets me validate a detector across many
  installations instead of guessing from my single unit. It runs on my own dime.
• Hours. Answering issues, chasing register maps across firmware generations,
  and refusing to ship a detector that cries wolf all take time. A physically
  wrong assumption costs weeks, and I've already had to throw one away.

🤝 What sponsoring funds

Test hardware, backend hosting, and the unglamorous hours: reproducing your bug,
reading the data before writing the code, and keeping the whole thing honest.

If money isn't an option, that's completely fine. Opening a good issue, testing a
beta, enabling telemetry, or translating the integration on Weblate all help just
as much. 🙏