A multipath data acquisition system based on USB communication

Abstract

The invention provides a multipath data acquisition system based on USB communication. The system comprises a data acquisition module, The data acquisition module comprises an A / D converter, a voltagefollower and a microcontroller, an analog input signal is filtered by the voltage follower; the signals are output to the A / D converter; the microcontroller outputs the digital signal converted by the A / D converter to a computer through the USB control chip and displays the digital signal; According to the invention, an external data acquisition system with low cost, high reliability and multiplepoints can be realized easily, so that the data transmission speed of the system can be improved, the flexibility of the system can be enhanced, and the maintenance of the system is facilitated; Andthe system can be in data communication with a PC (Personal Computer) through a USB (Universal Serial Bus) data bus interface, can display and store sampling data on the PC in real time, and can be applied to real-time acquisition of multi-path data in various occasions such as laboratories or industrial fields.

Description

technical field [0001] The invention relates to the field of data acquisition, in particular to a multi-channel data acquisition system based on USB communication. Background technique [0002] In various industries of industrial production and scientific and technological research, PCs or industrial computers are often used to collect various data. Data acquisition technology is an important branch of information science, which is a combination of information technologies such as sensors, signal acquisition, storage and processing. The process of converting the temperature, pressure, liquid level, etc. existing in the external world into analog or digital signals, and then sending them to the computer for further processing is the process of "data acquisition". Data acquisition has been widely used in the fields of industry and agriculture, medicine and health, ecological environment, aerospace, military, meteorology and other fields. It can realize the automation and syst...

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Problems solved by technology

[0008] (3) Under some harsh conditions, the common-mode voltage interference is very strong, such as the common-mode level is as high as 220V, and the task of data acquisition cannot be completed without isolation. Therefore, the suppression of common-mode interference must be considered according to the site environment. Even adopt isolation measures, including ground wire isolation, isolation between roads, etc.

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