A method and device for processing signals of a resistive sensor

Abstract

The invention relates to a resistive sensor signal processing method and device. The device comprises a power supply module, a pull-up resistor module, a sensor module, a constant current source module and a control module. One end of the sensor module is grounding, and the other end is separately in connection with the first end of the pull-up resistor module, the constant current source module and the control module; the second end of the pull-up resistor module is in connection with the power supply module; the control module controls the constant current source module to provide constant current for the sensor module; an estimated resistance value of the sensor module can be obtained according to the first voltage value at two ends of the sensor module and constant current; the resistance value of the pull-up resistor module is adjusted according to the estimated resistance value of the sensor module; and a current resistance value of the sensor module is obtained according to the second voltage value at two ends of the sensor module, the resistance value of the pull-up resistor module, and the power supply value of the power supply module. The technical scheme improves the measuring precision of resistance values in different ranges of resistive sensors.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a processing method and device for resistive sensor signals. Background technique [0002] A sensor is a detection device that can sense the measured information and convert the sensed information into electrical signals or other required forms of information output according to certain rules to meet the requirements of information transmission, processing, storage, and display. , recording and control requirements. Sensors are the primary link to realize automatic detection and automatic control. The existence and development of sensors allow objects to have senses such as touch, taste, and smell, and make objects come alive slowly. There are many classification methods for sensors, which are divided according to the measured physical quantity. The common ones are: temperature sensor, humidity sensor, pressure sensor, displacement sensor, flow sensor, liquid level sensor, forc...

AI Technical Summary

Problems solved by technology

[0009] It can be seen that in the signal processing process of the existing temperature sensor, there are the following problems. First, the pull-up resistor has always been a fixed resistance value within the entire measurement range of the resistance Rx of the temperature sensor. When the resistance difference between Rx and R is large, the measured Uo value is inaccurate, so when the resistance value difference between Rx and R is large, the measurement accuracy of Rx resistance will be affected

In addition, each temperature sensor requires a single-chip communication interface for signal acquisition, and the hardware resources of the single-chip are limited, so it is impossible to set up multiple temperature sensors to improve the measurement accuracy of the resistance value

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