Software meets hardware.
Code, circuits, hydraulics, and the things that connect them.
Projects and practical notes by Jon.
From the workbench
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How to Repair Brittle Automotive Wiring Connectors
Replace a broken sealed connector half instead of the full harness. SICMA Mini-Sealed 1.5 repair guide for engine-bay wiring.
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What’s new in the TekOnline 8-Zone HVAC Controller V3?
Control up to eight 24VAC HVAC dampers with ESPHome and Home Assistant. TekOnline V3 adds individual timed damper positioning, current monitoring and advanced UART expansion.
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An Audit Trail Is Not a Ticket Journal
A system can record who changed a field without helping the next person understand what happened. That difference matters when forms become ticket systems.
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Solve Your Own Problem First: The Best Way to Build Useful Software
The best way to build useful software: solve a problem for yourself. Lessons from a booking platform payment flow that had to be bulletproof.
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Can You 3D Print Wall Plugs? The Friction Science That Makes Them Work
Wall plugs do not hold with the screw. They hold the hole with friction and expansion. Here is the engineering, and a free generator to print your own.
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Why We Didn’t Buy the Blaupunkt TV: The Demo That Never Happened
Mixed online reviews about a TV’s sound quality. One simple question: can we hear it before we buy it? A 65-inch Blaupunkt, an Officeworks display floor, and a…