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CSI motion
(Beta). CSI motion detection runs only in the Beta firmware.
The node alerts when something moves nearby, even through a wall. It reads the change in Wi-Fi signals that a moving body causes. It needs ongoing Wi-Fi traffic in the area, and it detects movement, not a person standing still.
Wi-Fi signals bounce around a room off walls, furniture, and people. A person moving through the room changes how those signals arrive at the node. The node measures that change on the Wi-Fi frames it already hears and raises an alert when the change is large enough for long enough. It does not transmit, so it is passive.
- Web UI: Scan tab → CSI Motion Detection → Start Scan.
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Over mesh:
@ALL CSI_MOTION_START:0:FOREVERruns until@ALL STOP.
| Sensitivity | Behavior |
|---|---|
| Low (default) | Fewest false alarms. Two transmitters must agree |
| Medium | One transmitter is enough |
| High | One transmitter, with a lower trigger and shorter dwell. Alerts sooner, expect false alarms |
Set it with @AH01 CSI_CFG:SENSITIVITY=LOW (or MEDIUM, HIGH, or a number). @AH01 CSI_RECAL returns to the default.
Turn on Per-packet score to serial, note the highest sig value with the room empty, and set the trigger level slightly above it. If the empty-room and walking scores overlap, move the node.
Warning
If you turn off Listen only, never transmit, the node sends Wi-Fi probe requests when traffic is low. Anyone nearby can see them.
A C5 separates movement from background less cleanly than an S3, and its trigger scale is different. Do not copy a trigger value between the two boards. See DIGI C5 for how to set the trigger on a C5.