I am using a Plugable Technologies USB Bluetooth 4.0 Low Energy Micro Adapter purchased on Amazon. Because I'm using Windows 7 I had to use the Zadig application to replace the vendor's Bluetooth radio drivers with generic WinUSB drivers. Works great.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
I am using a Plugable Technologies USB Bluetooth 4.0 Low Energy Micro Adapter purchased on Amazon. Because I'm using Windows 7 I had to use the Zadig application to replace the vendor's Bluetooth radio drivers with generic WinUSB drivers. Works great.