Autorange Capacitance Meter

The capacitance meter begins by discharging the capacitor fully. Then it charges it and waits until the voltage across the capacitor reaches 0.632Vcc. The time is then captured and the capacitance is computed using Tau = RC. A 16 bit division routine written by Andy Warren is used for this project. The result is then displayed on the LCD. The process will then repeat itself every subsequent 0.255s.

As most of the commercial multimeter’s don’t incorporate Capacitance Meter’s, this project could prove very useful to your DIY electronic projects.

Capacitance Meter: [Link]