The C Meter Click Board™ is a mikroBUS add-on board with circuitry for measuring the value of capacitors. The design is based on a NE-555 timer/square-wave generator.
The chip is implemented in an astable multivibrator circuit with fixed resistors and adjustable capacitors.
The board has four different-sized plates for placing SMD capacitors (covering standard SMD packaging dimensions) as well as a socket for inserting a thru hole capacitor.
The board outputs a square wave frequency through the INT pin. Depending on the capacitor placed on the board, the value of this frequency changes. The value of a capacitor can be inferred using a simple algorithm (shown in the Libstock code example).
Onboard screw terminals are placed to allow the C Meter Click Board™ to be used with multimeter probes.
C Meter click is designed to use a 5V power supply, but can work with either 3.3V or 5V logic levels.