The PmodCDC1 is a capacitative sensor that uses the Analog Devices AD7156. By communicating with the chip via I2C, users can set the Pmod for an adaptive capacitance threshold that changes with the environment or set static thresholds that only trigger when a certain capacitance is reached.
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Datasheet (PDF)Schematics (PDF)
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Features:
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Based on the Analog Devices AD7156 2-Channel Capacitance Converter
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I2C communication interface
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Two capacitance input channels
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Adaptive proximity threshold
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Sensitivity up to 3 fF