Low-power-consumption reflection-type infrared optoelectronic switch control circuit of electromagnetic flowmeter

Abstract

The invention relates to a low-power-consumption reflection-type infrared optoelectronic switch control circuit of an electromagnetic flowmeter. Three reflection-type infrared optoelectronic switches, three inverter buffers and one two-way four-channel selective multiplexer are adopted, time-sharing control and button identification are carried out through an input / output (I / O) port of a single chip microcomputer, service life of the infrared optoelectronic switches is prolonged, and occupation quantity of the I / O port of the single chip microcomputer caused by inputting buttons is reduced. On-off time of an infrared emitting diode of the plurality of the reflection-type infrared optoelectronic switches in the electromagnetic flowmeter can be timely adjusted according to different working states such as working time and non-working time, and a problem that the electromagnetic flowmeter is always in a conducting state and consumption is big is avoided. In addition, only one I / O port of the single chip microcomputer is needed for receiving end portions of the plurality of the reflection-type infrared optoelectronic switches for time sharing judgment, and possibility is provided for extension of other functions of the single chip microcomputer.

Description

technical field [0001] The invention relates to a low power consumption reflective infrared photoelectric switch control circuit of an electromagnetic flowmeter, which is also suitable for controlling and judging multiple switches in other automatic controls or instruments. Background technique [0002] The reflective infrared photoelectric switches used in some instruments and meters currently use each switch to correspond to a single-chip I / O interrupt, and the diode at the transmitting end is always in a power-on state to wait for the key action to occur. The defects of this design are: [0003] 1. The emitting diode of the reflective infrared photoelectric switch is always in the energized state, while the electromagnetic flowmeter is in the non-key cycle processing state most of the time, and its unnecessary loss is too large, which brings great difficulties to the design of low power consumption. [0004] 2 For the electromagnetic flowmeter, at least three reflective p...

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Problems solved by technology

[0003] 1 The emitting diode of the reflective infrared photoelectric switch is always in the energized state, while the electromagnetic flowmeter is in the non-key cycle processing state most of the time, and its unnecessary loss is too large, which causes great difficulties in the design of low power consumption

[0004] 2 For the electromagnetic flowmeter, at least three reflective photoelectric switches are required, which are relatively many. If each photoelectric switch corresponds to an I / O port interrupt, it will occupy more hardware resources of the single-chip microcomputer, which is not conducive to other functions. extension of

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