Engineering Journal

Decisions, trade-offs, and the occasional mistake.

A living logbook of the build. Filtered by discipline, published consistently, written for engineers.

ESP-NOW

Why we chose ESP-NOW over Wi-Fi for the node link

TCP/IP is a heavy contract for a light-switch. Here's the reliability math that pushed us to a connectionless local link.

Jun 28, 20266 min
BLE

Provisioning a headless gateway over BLE — no account required

How we pair a phone to the gateway with a NimBLE GATT server and never ask the user to create a cloud login.

Jun 14, 20265 min
Architecture

The node registry: one table that does discovery, dedup, and security

A look at the single in-memory structure that anchors the gateway — and why we kept it small enough to reason about.

May 30, 20267 min
Product Design

Fitting a touch UI onto a 2.4" panel with LVGL

The on-device screen is the trust surface. Here's how we built it on a GC9307 IPS panel with a CHSC6540 touch controller.

May 16, 20265 min
Embedded Systems

Persisting boot count and reset reasons for field debugging

You can't attach a debugger to a gateway in a barn. So the firmware keeps its own black box.

May 2, 20264 min
Product Design

Why we're building InnoSyncHome in public

Engineering before marketing. Transparency over hype. Why the roadmap, the progress numbers, and the mistakes are all on this site.

Apr 18, 20264 min

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