basic works on proximity sensor

[bruces3]

There 2 type of proximity sensor : inductive and capacitive.

Capacitve type can detect material like glass, rubber, wood, etc.

Wonder how does the capacitive sensor works??

 

[IanP]

The heart of a capacitive proximity sensor is one capacitor plate (half a capacitor).

http://www.everything2.com/index.pl?node=Capacitive proximity sensor

Supplementary:
http://www.capsense.com/capsense-wp.pdf

Regards,
IanP