General expansion module for Internet of Things monitoring system

Abstract

The invention provides a general expansion module for an Internet of Things monitoring system. The general expansion module for an Internet of Things monitoring system comprises a first resistor, a second resistor, a third resistor, a fourth resistor and a switch element, wherein one end of the first resistor is connected with an input end, and the other end of the first resistor is connected with an input port PA0 of a singlechip; one end of the second resistor is connected between the first resistor and the input port PA0, and the other end of the second resistor is connected with a first control port PA1 of the singlechip; one end of the switch element is connected with the input end through the third resistor, and the other end of the switch element is grounded; the switch element is connected with a second control port PA2 of the singlechip through the fourth resistor; and breakover and cut-off of the switch element can be controlled by utilizing the second control port PA2 to apply voltage. The general expansion module for an Internet of Things monitoring system enables that the signals, such as a current signal and a voltage signal, can be input from the same port and output from the other corresponding port, thus avoiding repeated design, realizing product standardization and enabling the product to have superior expansion capability.

Description

technical field [0001] The invention relates to the technical field of circuit control equipment, in particular to a general extension module applied to a monitoring system of the Internet of Things. Background technique [0002] At present, the electrical signals of automation control access points in laboratories, hospitals, pharmaceutical factories and other industries have certain specifications and standards, and there are not many types of signals, such as commonly used analog signals 0-10V input, 0-10V output, 0-20Ma input , 0-20Ma output, switch signal input, passive switch output, RS485 communication, Ethernet port, etc. Although there are not many types of signals, different users often use different numbers of signals in the control of equipment. As a result, when designing products, it is necessary to frequently increase or decrease the electrical signal interface of the product, making it difficult to form standardization. , a serious waste of human resources a...

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Problems solved by technology

Although there are not many types of signals, different users often use different numbers of signals in the control of equipment. As a result, when designing products, it is necessary to frequently increase or decrease the electrical signal interface of the product, making it difficult to form standardization. , a serious waste of human resources and inconvenience for future expansion, based on the above problems, it is necessary to design a universal expansion module that can automatically convert various input signals and output corresponding signals

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