Embedded Lab

DIY LC meter projects are very popular among hobbyists and students. Here is another LC meter project which is based on PIC16F628A microcontroller. It uses a tank oscillator circuit combining a few external components and PIC’s internal comparator module. The L and C values are computed from the resonant frequency of the LC tank circuit. The project also incorporated auto-calibration by shorting the test leads. The meter uses a standard 2×16 character LCD for display.