Turn your Wi‑Fi devices
into motion sensors

Wi-Fi motion sensing uses the disruption of Wi-Fi signals between devices to detect movement. When someone walks between two Wi-Fi nodes, they interrupt the signal path, creating a detectable pattern that TOMMY uses to identify motion.

Unlike PIR sensors that require line-of-sight and can miss motion behind furniture, Wi-Fi sensing detects movement through walls and obstacles. It provides whole-room coverage from two nodes.

The current version detects all movement including pets, curtains, fans, and other moving objects. Future versions will include filtering, but for now you can adjust the sensitivity slider to reduce small movement detection.

TOMMY currently only detects movement, not stationary presence. Stationary presence detection is expected in Q1 2026.

No hub required. TOMMY runs as a Home Assistant add-on or on a Linux host (Docker) and uses supporting devices to create a sensing network. Everything runs on your local network with no cloud dependencies.

Minimum 2 devices per zone. While more devices can provide better coverage, there are diminishing returns after 4 devices in most zones. Focus on placement for zone coverage rather than maximizing device count.

The devices do not need to be on the same router (e.g. in mesh setups), but they do need to be on the same network to communicate. Most home networks meet this requirement automatically.

Yes, TOMMY works as an external component and will run alongside your existing ESPHome components without conflict. You can continue using all your current sensors, switches, and other integrations.

Yes. TOMMY is fully local and self-hosted with no cloud components. Everything runs on your network, all processing happens locally, and no data ever leaves your home. You don't need an internet connection for it to work.