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, ...

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.

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.

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.

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..