Abstract: This paper introduces the design scheme and characteristics of medical automatic door, and elaborates on the minimum module red and outer detection module step of the single-chip microcomputer, the door stroke detection module and the fault detection module of the motor drive module, and explains the actual application. Kind of situation.

0 Preface

With the rapid development of science and technology and the increasing living standards of people, various automation systems have begun to enter all aspects of human life.

The automatic door is convenient and efficient. The use of automatic doors in hospitals and pharmaceutical plants not only facilitates the transportation of emergency patients and medicines, but also has the characteristics of low noise and good stability compared with traditional manual doors. However, in real life, automatic Doors are not popular in hospitals and the pharmaceutical industry. In the current era of digitalization, it is imperative to produce medical automatic doors for hospitals and the pharmaceutical industry. Therefore, this paper designs a flat open medical automatic door based on single chip microcomputer.

1 System module introduction

According to the basic requirements of the design, the system is divided into 8 major modules, namely the single-chip microcomputer minimum system module #infrared detection module #stepper motor drive module, door stroke detection module and fault detection module, as shown in Figure 1.

1.1 MCU minimum system module

The single-chip microcomputer is an embedded microcontroller, referred to as a single-chip microcomputer, commonly referred to as the abbreviation MCU. The MCU was first used in the field of industrial control, and later gradually expanded to various fields with the improvement of modern technology. At present, most of the domestic and foreign use is a single-chip microcomputer that is extended by 51 cores.

AT89C51 single-chip microcomputer is a high-performance, low-power, low-cost microcontroller in 51 series single-chip microcomputer. It has abundant resources on the chip, and has less waste and good stability. It meets the requirements of this design. Therefore, AT89C51 single-chip microcomputer is used as the design here. Microcontroller.

The minimum system of the single-chip microcomputer consisting of AT89C51 single-chip microcomputer and its peripheral circuits is the core part of the medical automatic door master control system. The minimum system of the MCU consists of AT89C51 and a small number of peripheral circuits (power supply circuit, reset circuit, crystal oscillator circuit). The main function of this circuit can realize the receiving and processing of infrared pyroelectric sensor signals, the control of stepping motor, the detection of door stroke and the detection of faults. It is the core circuit of signal processing and transmission.

This circuit is mainly composed of a reset circuit and a crystal oscillator circuit. The function of the reset circuit is to provide a reset signal when the system is powered up, and then cancel the reset signal after the system power supply is stable. The function of the crystal oscillator circuit is to provide a clock signal for system operation. The schematic diagram of the minimum system circuit of the single chip microcomputer is shown in Figure 2.

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