* f1, f2. and f3 are the frequencies defined by the equations stated on Digital LC Meter.
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diagram using internal Analog Comparator and Timer Peripherals of PIC18:
schematic with actual values:
*simulation on Proteus 7 is NOT working (particularly the LC oscillator part and internal pull-up on RB0)
download link (HEX and PC app): PIC18F2550_USB-HID_LC-Meter.zip
elab.ph forum link:
PIC18F2550 USB LC Meter
# edit (10-20-10)
added "Calibration option" ( same PIC18F firmware )
- reference capacitance range is 1.0nF +/- 5%
- Fosc (20MHz crystal with PLL) frequency range is 48MHz +/- 200ppm
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