The NXP Zigbee SDK is not well setup for use with C++. Although I prefer it over the Texas Instruments ZStack for various reasons, ease of C++ development is not one of them. I had no trouble converting ZStack sample programs to C++. I had all sorts of issues with the NXP SDK.

My attempt to develop custom firmware for the Aqara E1 Zigbee wall switch (link coming soon) necessitated learning NXP’s Zigbee SDK for the JN5189.

A comprehensive list of major Zigbee IC vendors and module makers, including a matrix of which module maker use which vendor's ICs.

How to configure an ATMega328p to consume lest than 1uA, while still retaining the ability to wake the processor up periodically via timer (or external interrupt).

Discussion of the design and implementations problems encountered during the design/construction of my in-wall Bluetooth audio player, with environmental sensors, proximity wake-up, metadata display, and cat animations.

Firmware design for the Bluetooth audio player project. The basic architecture uses events to trigger external interrupts. Handlers post the event details into a queue and a simple control loop polls the queue and dispatches events to various handlers.

Circuit and PCB design for the Bluetooth audio player project. The circuit design is not complicated. The main sections are MCU with 8MHz crystal and supporting caps, ...

My latest project is a cat-themed Bluetooth audio player to be permanently installed in my bathroom. The unit will be housed in a standard electrical junction box on the bathroom wall..

STM32 microcontroller cheat sheet by product line, feature, model number. Includes product code descriptions and timer/peripheral information.

This is part 4 of a 4-part series on building a toaster reflow oven: Oven hardware Controller hardware Manufacturing Controller software Continuing on from the prior posts on the controller hardware and manufacturing, the device needs software.

This is part 3 of a 4-part series on building a toaster reflow oven: Oven hardware Controller hardware Manufacturing Controller software So far we’ve looked at the hardware design, but aside from modifying the oven in part 1, nothing has been built yet.

This is part 2 of a 4-part series on building a toaster reflow oven: Oven hardware Controller hardware Manufacturing Controller software In part 1 we discussed the selection and modification of the oven itself. It’s now time to work on the external controller.