# xaafloor - xAAL SensFloor Fall Detector
This xAAL device connects (via USB or TCP) to a a SensFloor device (by FutureShape <http://future-shape.com/system/>)
Based on activation messages received from the SensFloor device, this xAAL device manage a table of the global floor state.
Then, it checks if the mats activation looks like a fall or someone lying on the floor.
In case of falls detections, it sends alerts on the xAAL bus.

A fall is defined by at least 8 contiguous triangle mats with an activation capacitance greater than 22.
(These magic thresholds sounds good...)

In order to be reactive, this device look at falls each time it receives a message from the SensFloor device, and also every 5 seconds.

The pseudo-recursive algorithm is rather simple and has some limitations:
- each triangle mat is checked several times; efficiency could be improved ;-)
- two close falls only separated by a single inactive triangle are considered as one global fall

Volunteers are welcomed to improve this.