MICROCONTROLLER CAPACITANCE TRANSDUCER FOR DIELCOMETRIC USB GRAIN MOISTURE METERS Russian patent published in 2023 - IPC G01N27/22 G01R27/26 

FIELD: measuring technology.

SUBSTANCE: invention is related to devices for measuring physical quantities with capacitive sensors. The microcontroller capacitance transducer for dielcometric USB grain moisture meters contains resistors 1 and 2, electromagnetic relay 3, semiconductor diode 4, capacitive sensor 5, microcontroller 6, RC filter 7 and computer 8. The first outputs of resistors 1 and 2 are connected to the outputs, respectively, of the first and second pulse-width modulators (PWM) built into microcontroller 6, the second outputs of resistors 1 and 2 are connected, respectively, to the first and second contacts of relay 3. The first plate of sensor 5 is connected to the third contact of relay 3 and to the first input of the analog comparator (AC) built into microcontroller 6, the second plate of sensor 5 is connected to a common wire, the output of the third PWM built into microcontroller 6 is connected to the input of RC filter 7, the output of which is connected to the second AC input of microcontroller 6. The anode of diode 4 is connected to the first output of the coil of relay 3 and to the digital output of microcontroller 6, the cathode of diode 4 is connected to the second output of the coil of relay 3 and to the common wire. Computer 8 is connected via digital serial USB interface to microcontroller 6.

EFFECT: improved accuracy of dielcometric measurement of grain moisture.

1 cl, 1 dwg