body detector

[george leung]

I have a project to build once my hand approaches the sensor(or metal plate) appro. 10 cm, A LED lights on; at about 8 cm distance,
B LED turns on and at about 5 cm, C LED turns on(Total there is 3 LED).Would somebody give me any circuit diagrams??( As I use a MCU to check any frequency change if there is any movement so that which LED to turn on).

[Chris Smith]

A 555 can be tweaked up to go off at several feet, near pin #3. Email on the way.<p>Correction, pin #2<p>[ April 01, 2004: Message edited by: Chris Smith ]<p>[ April 03, 2004: Message edited by: Chris Smith ]</p>