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 ...

[youtube=http://www.youtube.com/watch?v=qmugZcobahA&w=640&h=360] San Francisco-based startup Coin may not have launched yet, but it has created a hardware platform ...