Multichannel low-current collection method and system based on single chip microcomputer control

Abstract

The invention discloses a multichannel low-current collection system based on single chip microcomputer control. The system comprises a multi-channel relay switching circuit, a multi-channel selection control circuit, a multi-channel sensor, a current-to-voltage conversion circuit, an A / D (analog / digital) sampling switching circuit, a single chip microcomputer processor, an SD card storage circuit and an LED nixie tube display circuit. Multi-channel low current can be collected and stored in real time, a single chip microcomputer is adopted for control, an interface circuit is used for communication with an upper computer, and collected data are automatically uploaded to the upper computer through the interface circuit. The system is simple in structure, easy to implement, higher in accuracy, small in error and capable of being widely applied to a multichannel low-current collection circuit which has higher requirements for accuracy of collection result and is easy to expand.

Description

technical field [0001] The invention relates to a small current real-time collection system, in particular to a multi-channel small current collection method and system based on single-chip microcomputer control. Background technique [0002] In the fields of laboratories, automatic detection systems, and industrial control systems, various acquisition systems that meet different needs are required to achieve computer-based on-site data acquisition. At present, most general-purpose data acquisition systems use analog switches to switch channels. The resistance is large, and each channel is not completely independent. Most of them can only collect some general signals. The product has strong versatility, but it is suitable for small Current acquisition has the disadvantages of long acquisition interval, complicated setting and modification parameters, poor applicability, low precision, and large error, which greatly affects the integrity and accuracy of the collected data. ...

AI Technical Summary

Problems solved by technology

At present, most general-purpose data acquisition systems use analog switches to switch channels. The resistance is large, and each channel is not completely independent. Most of them can only collect some general signals. The product has strong versatility, but it is suitable for small Current acquisition has the disadvantages of long acquisition interval, complicated setting and modification parameters, poor applicability, low precision, and large error, which greatly affects the integrity and accuracy of the collected data.

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