Wavey
@wavey

Wavey is an open-source WiFi CSI sensing stack: ESP32 nodes capture Channel State Information from the ambient WiFi channel in real time. The output is occupancy, motion, and presence inference for a space, without turning the room into a camera network or asking people to carry a device.

Channel State Information (CSI) is how a WiFi link measures the channel between transmitter and receiver: amplitude, phase, and delay across many OFDM subcarriers. A single RSSI reading collapses that into one number; CSI keeps the detail.

Walls, furniture, and bodies all reflect and absorb radio energy. When someone moves or stays still enough that breathing shifts the field, the subcarrier pattern shifts in consistent ways. Sensing systems read those shifts to infer what changed in the environment.