Liquid level sensor type CAN bus stepping motor controller

Abstract

The present invention discloses a liquid level sensor type CAN bus stepping motor controller. The controller comprises: an interface circuit having a positive capacitive detection pin and a negative capacitive detection pin, wherein the positive capacitive detection pin is coupled with an inner wall of a sampling needle, and the negative capacitive detection pin is coupled with a shielding layer of the sampling needle; a single-chip microcomputer circuit coupled with the interface circuit, wherein the single-chip microcomputer circuit is internally provided with a liquid level threshold capable of being set, the liquid level threshold corresponds to operation signals, and the single-chip microcomputer circuit is internally provided with a temperature early warning and overheat turn-off function with a set threshold; and a stepping motor drive circuit coupled to the single-chip microcomputer circuit and coupled with a stepping motor externally linked with the sampling needle. The liquidlevel sensor type CAN bus stepping motor controller is provided with the interface circuit, the single-chip microcomputer circuit and the stepping motor drive circuit to effectively employ the capacitance of the sampling needle itself to detect the liquid level, and therefore, the series of problems caused by n extra arranged liquid level sensor in the prior art cannot be generated.

Description

technical field [0001] The invention relates to a motor controller, in particular to a liquid level sensor type CAN bus stepper motor controller. Background technique [0002] In some industries, such as the biochemical analysis instrument industry, it is often necessary to detect the position of the liquid level through the metal sampling needle in motion, and the movement of the sampling needle is driven by a stepping motor. The traditional motor driver and the liquid level sensor are separated. After the motor driver and the liquid level sensor need to be installed in the application process, the two need to be connected, which brings additional cost and space cost to the application, reducing the This increases reliability and increases the difficulty of system design. Contents of the invention [0003] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a liquid level sensor type CAN bus stepper motor controller integrated ...

AI Technical Summary

Problems solved by technology

The traditional motor driver and the liquid level sensor are separated. After the motor driver and the liquid level sensor need to be installed in the application process, the two need to be connected, which brings additional cost and space cost to the application, reducing the Increased reliability, but also increased the difficulty of system design

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