Is anyone aware of any energy harvesting Bluetooth or ZigBee devices?
It would be great to have open/close,movement sensors and temp sensors that didn’t require batteries 
The only one I know of is this Philips Hue remote.
IIRC they use Enocean’s technology under the hood. They offer some interesting stuff but I haven’t seen it in other products yet.
I’m really hoping for a breakthrough here. Swapping batteries is getting old…