This is a simple capacitance meter which can measure capacitance value easy.
There are some measurement methods for capacitance, at one time the capacitance was measured with a impedance bridge or a dip meter.
Recently typical capacitance meters can measure capacitance and some additional characteristics from current vector by applying AC voltage to the Cx.
Some simple capacitance meter use integration method that measureing transient response of the R-C network.
There are some construction kits based on this method.
This project uses the integration method. There is an advantage that the resulut can be got as a digital data directly because it bases measurement of time, accurate analog circuit is not required and its calibration can be done easy by using a microcontroller.
Therefor the integration method is suitable for hand built capacitance meter with high realizability.