People Sensors

Muscle motion sensors

John Mullan

I have seen an interesting gizmo on the web that places a wire in two opposing walls. One essentially a transmiting antenna and the second a receiver. It is adjusted to the "inductance/reactance" of an empty room. When a body enters the room, it capacitively changes the field. The circuit detects this and knows that the room is occupied.

Proximity

Breath Pressure Sensors

see also:

• http://www.bik.com/ occupancy sensor
• http://www.rapidttp.co.za/transponder/newssup6.html
• http://www.acroname.com/robotics/parts/R1-442-3.html
• http://www.4qd.co.uk/ccts/pdet.html

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