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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:

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Quick, Easy and CHEAP! RCL-1 RS232 Level Converter in a DB9 backshell
Ashley Roll has put together a really nice little unit here. Leave off the MAX232 and keep these handy for the few times you need true RS232!

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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