Method and means for sensing a change in capacitance by a computer
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United States of America Patent
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Sep 8, 1992
Grant Date -
N/A
app pub date -
May 17, 1990
filing date -
May 17, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and means for using a computer for sensing a capacitive change in a sensor having a capacitive impedance component. The sensor is connected between the input and output ports of a computer which produces a periodic waveform at the output port and monitors the capacitor's discharge or charge time at its input port. The monitored times are compared to previous monitored times wherein a change in time indicates a change in capacitance.
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