MICROCONTROLLER FOR MEASURING SHAFT ROTATION FREQUENCY Russian patent published in 2010 - IPC G01R27/26 

FIELD: measurement technology.

SUBSTANCE: invention relates to measurement technology particularly to the devices for measuring shaft rotation frequency using a capacitance sensor and can be used in automatic process control systems to measure nonelectrical quantities. The microcontroller for measuring shaft rotation frequency contains a microcontroller, an indicator, a capacitance sensor and two resistors. The indicator is connected to one of the microcontroller ports. The first plates of the sensor and the capacitor are connected to the common wire, the second plates of the sensor and the capacitor are connected to the first and second ports of the analog comparator of the microcontroller respectively, as well as to the first terminals of the resistors whose second terminals are connected to the microcontroller terminals.

EFFECT: simplified diagram and extended capabilities of the device namely it enables to measure either the shaft rotation frequency or the sensor capacity.

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