Home Motor drivers Solar engines Sensors Contact Sensors Proximity Sensors Sound Sensors Field Sensors State sensors Complete robots Misc. circuits   The BEAM Circuits Collection is a BEAM Reference Library site.		Field (electric, capacitance) sensors Teaching your 'bot to play the field Field sensors aren't used much in BEAMbots yet (principally because of the power and complexity some designs require). A couple, though, have been put forward to date (bear in mind that I haven't built either, so you're on your own here...): Wilf Rigter's E-sensor The incomparable Wilf Rigter came up with an E-field detector (well, two variant designs actually) that your bot can use: Either of these (and just on a hunch, I'd suspect the 2N7000 version is easier to get parts for) should work equally well; note that the human body is a good absorber of stray RF fields, so this sensor should be a good people-detector.   Rich Caudle's capaciflector There's more info on the capaciflector here, and a brief abstract on it here. For more information... There's a very detailed page on building an electrometer (E-field detector) with a single FET here.
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