Universal Bluetooth Audio Adapter

Description

The Universal Bluetooth Audio Adapter will act as either a transmitter or receiver for audio sent over Bluetooth. As a receiver, it could be plugged desktop speakers so that music could be played from a smartphone through the speakers wirelessly. As a transmitter it could be plugged into the headphone jack of a television set and the audio from the TV could be heard through a set of Bluetooth headphones.

There are commercial products that provide some of this function already but I could not find exactly what I wanted so I'm building it.

I'll start by building out the project on a breadboard using development boards and once that's functional I'd like to design and fab custom boards resulting in a small useful device.

Components

1 × Trinket Pro - 3V Adafruit ID: 2010

1 × SparkFun Micro OLED Breakout Sparkfun SKU LCD-13003

1 × Adafruit Pro Trinket LiIon/LiPoly Backpack Add-On Adafruit ID: 2124

1 × Lithium Ion Polymer Battery - 3.7v 500mAh Adafruit ID: 1578

Project Logs

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Parts are here!
brnd4n • 12/16/2014 at 21:43 • 0 comments

I received a Trinket Pro, LiPo board, and 500 mAh battery from Adafruit and Sparkfun's Micro OLED breakout board. I had also ordered a BLE audio board from Sparkfun but they sent me the wrong version. I hope that error will be remedied in time for this contest.
The first thing I did was solder pins onto all the boards and connect the screen up to the Trinket over SPI. A quick installation of drivers and the OLED library from Sparkfun showed everything is working correctly. The Trinket is being powered by the battery and can easily drive the screen. Video of the success below!
I'm going to work on the UI code while I wait for the correct board from Sparkfun.

View project log

Discussions

Frontier9 wrote 08/17/2021 at 10:13

Let me know how you are getting on with that - i'm looking to add functionality but using ESP32

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Universal Bluetooth Audio Adapter

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