Also, you can add the HM-10 module which is Bluetooth low energy - but it's a lot more difficult to use than Bluetooth LE on Puck.js
@Gordon started
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.
Also, you can add the HM-10 module which is Bluetooth low energy - but it's a lot more difficult to use than Bluetooth LE on Puck.js