Jennifer Pattison Touhy has a story on The Verge today about a technology debuting soon that turns existing smart lights into motion sensors:

Sensify is a proprietary technology based on wireless network sensing (WNS) that works with Zigbee-based smart devices, like Hue smart lights. According to Pattison Touhy:

WNS works by detecting disturbances in radio frequencies and can also be applied to Wi-Fi, Bluetooth, and Thread technologies. McKinney says Sensify requires three or more devices positioned around a detection area to detect motion and occupancy in the space. The tech also allows for precise detection zones based on where the devices are situated. “The devices send messages to each other, look at underlying network diagnostic information, and process it to provide occupancy sensing decisions,” says McKinney.

The story goes on to explain the performance of the technology:

Performance-wise, McKinney says Sensify is “equivalent or superior” to passive infrared sensing (PIR) tech, which is traditionally used for motion sensing. It also doesn’t need line of sight, as PIR does. However, it’s not as precise as technologies like mmWave sensing, which can determine if someone is in a room through as slight a movement as breathing. “The lights will still likely turn off if you’re still, even if you’re in the space,” he says.

That’s great to hear and something I hope is enabled by manufacturers without charging an additional fee or subscription. I know that may be wishful thinking, but even if there is a fee, it may be worth it to not litter your home with less accurate motion sensors everywhere and could give Hue and other Zigbee-based device makers an advantage over other companies.