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Detecting Small Capacitive Sensors Using the MCP6291 and PIC16F690 Devices

Authored on: Jun 25, 2007 by Kumen Blake and Steven Bible

Technical Paper / Application Note

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This application note is intended for hardware and firmware design engineers that need to accurately detect small capacitance values. It shows how to use a PICmicro microcontroller and minimal external circuitry to detect small capacitances. The design is based on an operational amplifier (op amp) integrator. A capacitive humidity sensor is used to illustrate this type of application, and alternatives and modifications to the design are briefly discussed.

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