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Implement capacitive proximity sensing, Part 2

Posted: 06 Feb 2009     Print Version  Bookmark and Share

Keywords:sigma-delta  proximity sensor  LED 

Part 1 of this two-part series discusses the theory about the sigma-delta modulator. Part 2 illustrates the design of a proximity sensor that will detect an approaching hand and switch on an LED.

Capacitive-proximity sensors have been used widely in industrial applications such as counting products on a conveyor, detecting position of valves, presence of objects etc. In recent years, the use of capacitive-proximity sensors has moved into other areas like automotive (keyless entry) and consumer goods (automatic backlight control).

A proximity sensing system has a sensor (which could be a wire, PCB trace, or a part of the enclosure), a circuit to measure the capacitance of the sensor, and logic to detect the change in capacitance when another object approaches the sensor. Two types of sensors can be used in proximity sensing: dual-pole and single-pole.

View the PDF document for more information.

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