Wall Switch for Shelly
A momentary wall switch that nobody sells, made by fitting micro switches behind the rocker arms of an Elko RS-16 — safe on 240 VAC with a diode, resistor and zener holding the switches inside their ratings.
Electronics, integration and process engineering
Projects and notes from thirty years of building things — business systems and instrumentation, home automation, and hobby hardware.
- Work Business systems and instrumentation — product information, e-commerce, ERP, print production, and the measuring and control hardware that came before it. 16
- Home automation A house wired up over several years, mostly with Shelly modules. Each of these is a specific problem and how it was actually solved, including what did not work. 8
- Hobby Things built for the pleasure of building them, and occasionally because nothing on sale did the job. 5
Selected work
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WiFi and Verisure Water Valve
Board that closes the incoming water valve three ways: by hand, over WiFi through a Shelly 2.5, or automatically when any Verisure detector in the house finds water.
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New e-commerce platform for the AJ group
Replacing every site in the AJ group with Wipcore’s eNova platform — from the 2009 decision to 18 live sites within the year — and the ten people pulled off a street in Borgholm whose struggles changed the design.
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Converting Toyota Prius to plug in HEV
Centralised battery monitoring for a plug-in Prius conversion: up to 79 cells, temperature inputs, two CAN buses, charge management and WiFi — and 40 to 60 km on electric alone.
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Windows based client / server system for Print production and prepress
The .NET and SQL successor to the Mac system, adding page approvals, PDF merging and InDesign Automator — with clustered InDesign servers that elect their own master, so output scales by adding machines.
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Probably the world’s first Windows based ERP system
KAOS — Kund, Artikel, Order, Statistik — built in the first half of the 1990s, before anyone was calling this sort of thing ERP.
