MULTICHANNEL MEASURING TRANSDUCER FOR SOIL MOISTURE MONITORING SYSTEMS WITH CAPACITIVE SENSORS Russian patent published in 2024 - IPC G01R27/26 

FIELD: measurement.

SUBSTANCE: invention relates to devices for measuring physical quantities with capacitive sensors. Device comprises microcontroller (1), radio module (2), resistive matrix (3), digital temperature sensors (4) S1, S2…Sn, resistive voltage divider (5). Resistive matrix (3) contains resistors R1, R2…Rn/2, where n is number of capacitance sensors C1, C2…Cn. Capacitive sensors are connected by the first plates to the common wire, the second plates of the capacitive sensors are connected to the terminals A1, A2…An of microcontroller (1). First and second terminals of resistive voltage divider (5) are connected to digital terminals D1 and D2 of microcontroller (1), and the middle terminal is connected to the non-inverting input (AIN0) of the analogue comparator. Radio module (2) is connected via a digital serial interface to microcontroller (1). Digital temperature sensors (4) are connected to microcontroller (1) via 1-Wire interface.

EFFECT: converting the capacitance of the n-th number of capacitive sensors by one microcontroller, which enables to create compact probes for wireless monitoring systems.

1 cl, 1 dwg