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.

Installation, power, and speaker connections for the custom made in-wall Bluetooth audio player. The wall plate connects to the speaker connections and power control electronics via a single RJ45 cable.

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.

Mechanical design for the in-wall Bluetooth audio player project. The most difficult aspects of the design are mechanical. Fitting the module into a standard electrical junction box without visible fasteners, while allowing for it to be easily removed and look good is quite a challenge.

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 1 of a 4-part series on building a toaster reflow oven: Oven hardware Controller hardware Manufacturing Controller software After reflowing for some time with hot air and saucepans, I’ve decided it’s time to build a dedicated reflow oven.

With a plethora of manufacturers and models for pool solar controllers, it can be challenging to put together a system that just works, without resorting to sourcing everything from a single manufacturer and buying their overpriced controllers.