The voice controlled arduino blinds project is a good example of IoT related project. It features an arduino nano and a HC-06 bluetooth module device that simplifies circuiting of the entire system.

If you're looking for a way to turn your Bluetooth speaker into a Spotify Connect device, then this is the way.

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 ...