Blog

Tech, embedded, smart home, and everything in between.

EnergyDevTools# par14a# enwg# grid-fees# heat-pump# wallbox# battery-storage# smart-meter# sqlite# web-scraping# open-data

Par14a-Database – 754 Price Sheets, One SQLite File

What does my grid operator really charge a heat pump or wallbox under §14a EnWG? I dug through the price sheets of all 754 German distribution grid operators and turned them into one queryable database.

2026-10-26

DevEnergyTools# forecasting# machine-learning# lightgbm# noaa-gfs# grib2# timescaledb# day-ahead# price-forecast# photovoltaics# battery-storage

PredictionDB – Digging for Next Week's Power Price in Free Weather Data

Tomorrow's prices are free at 13:00 anyway – a half-built stack that forecasts German load and power prices for the whole coming week, so a battery can plan further than tonight.

2026-10-25

EmbeddedSmart HomeDIY# web-bluetooth# BLE# PWA# svelte# typescript# hoermann# bluesecur# garage-door# webcrypto

Hoermoles BlueObscure – My Garage Door in a Browser Tab

The sequel to the reverse-engineering dig – porting the Hörmann BlueSecur protocol to Web Bluetooth and shipping an installable, offline, no-app-store PWA that opens my burrow from a browser tab.

2026-07-24

EmbeddedSmart HomeDIY# bluetooth# BLE# reverse-engineering# hoermann# bluesecur# garage-door# python# home-assistant# bleak

Hoermoles BlueObscure – Digging a Second Tunnel Into My Own Garage

How I reverse-engineered the Hörmann BlueSecur BLE protocol out of a .NET MAUI app and ended up opening my garage door from a laptop terminal.

2026-07-23

DIYHardwareEmbedded# USB-C# PD# power# trigger board# HW-398# power-delivery# hardware# diy

One USB-C Charger to Power Them All – The HW-398 PD Trigger Board

A tiny solder-pad board that tricks any USB-C PD charger into outputting 9 V, 12 V, 15 V or 20 V – perfect for ridding your burrow of the barrel-jack jungle.

2026-05-14