What is it?

Breadboard adapter for BT audio modules BM23 from Microchip.

Microchip sells a development board with a BM23 for more than 50$. So I decided to design my own and sell spare boards here on Tindie. The module is not included.

Why did you make it?

I'm working on a project that includes bluetooth audio and I want to try various bluetooth audio modules. Bluetooth modules are always in the form of a board designed to be soldered on the main PCB so they are not breadboard compatible. This makes prototyping with them really difficult, so I made a breadboard for each bluetooth module I got my hands on :).

What makes it special?

It's open source, and all of my creations source files are on my GitHub page. The link can be found below in the documentation section. Board schematics are made in KiCad OSS SW. Board design is tested by me. If any bugs show up, I will ship it fixed or the fix will be documented here (in case it cannot be fixed in advance).

Board capabilities:

• breadboard friendly

• RESET button

• MFB button (for the start of the module, if autostart is not configured via UI tool)

• 2 LEDs

• Mic input (3.5mm jack) with support circuits

• AUX input (3.5mm jack) with support circuits

• micro USB port for power

• provision for separate battery 2pin header (2,54mm/0.1")

• pins of the module are routed to 2.54mm(0.1") headers

What package include:

default(1$):

• PCB board

optional smd components include(+3$):

• 2x button (for MFB and RESET)

• 2x 3.5mm stereo jacks

• passives (caps, resistors, 2xLED)

• pin headers (1x18pins)

option for soldered components (not BM23) is + 5$

spin-off as part of the project:

• I designed support files for KiCad (library symbol, module footprint) for BM20,23,62 and BM64 modules
• I work on the Arduino library for BMXX modules, check wiki page about upgrading module firmware.

None of option includes the actual bluetooth module.

Useful links:

Link to my configuration files on github: BM20

BM23 module overview on Microchip site

Arduino library for this module

KiCad project of this board(schematics,PCB design etc)

footprint KiCad library including BM23 modules

[BM23 schematics symbol for KiCad)(https://github.com/tomaskovacik/kicad-library/tree/master/library)

(you need files from the last 2 links for opening Kicad Project)