The HC-05, a Bluetooth to serial bridge, can be found for around $5 on the internet and therefore may be the cheapest way to add Bluetooth connectivity to your project. However, its default settings ...
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I turned the Arduino Uno Q into a streaming server for my Bluetooth speakers
If you're looking for a way to turn your Bluetooth speaker into a Spotify Connect device, then this is the way.
Before we dive in don’t be confused by the title. This doesn’t flash firmware to the device. But it does automate the process of setting up the Bluetooth to serial module for use in your projects.
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