Ultrasound could waken a sleeping smart home

 The home of the future, we are assured, will be swarming with tiny sensors: security cameras, carbon monoxide detectors, speakers, and everything else. Few need to be running all the time — but how do you wake them up when they’re needed if they’re off in the first place? Ultrasound. Read More
Ultrasound could waken a sleeping smart home was first posted on https://techcrunch.com/gadgets/