Foreword
The remote automatic detection system of hospital patient's body temperature and other parameters is an important project in hospital digital construction. The design is mainly for remote automatic detection of hospital patient's body temperature, using distributed multi-point temperature acquisition technology, and transmitted to the hospital monitoring center through Ethernet communication technology. The doctors and nurses on duty can know the patient's body temperature change in real time through the monitoring center. The center can alarm and record the abnormal temperature of the patient and synchronize with the patient database to facilitate the doctor's analysis of the patient's condition.
1 system overall design
Figure 1 overall design block diagram
The overall design block diagram of the system is shown in Figure 1. The entire system uses a three-level structure, namely the hospital monitoring center, the ward host and the temperature sensor. The ward host adopts the single-chip AT89C52 as the main control unit, which mainly realizes network communication, temperature acquisition and display. The network communication is realized by the Ethernet to serial port module ZNE-100T. Each ZNE-100T can set the IP address and the server IP address to facilitate the formation of a distributed temperature measurement network. The temperature measuring component adopts the digital temperature sensor DS18B20 produced by American DALLAS Semiconductor Co., Ltd. Each DS18B20 has a unique ID number, which is small in size and can be packaged into a common thermometer. The longest distance of the cable can reach 80 m, which is convenient for distributed placement. On the patient. The temperature data can be scrolled on the LCD of the ward host. The network communication between the hospital monitoring center and the hosts of each ward adopts the CS architecture, and the ward host sends each channel temperature data to the hospital monitoring center every minute. The hospital monitoring center receives data from the wards of each ward, and can display the temperature changes of each patient in real time in a curve or digital manner, and perform abnormal processing and corresponding information recording, and synchronize with the patient database to promptly remind the doctors and nurses on duty to pay attention to the patient's situation. .
2 hardware design
2.1 MCU main control unit design
The AT89C52 is a low-voltage, high-performance CMOS 8-bit MCU with 8KB of FLASH and 256B of RAM. The chip has a built-in general-purpose 8-bit CPU with 32 bidirectional I/O ports. The P0 port of the MCU is used for the live display circuit, and the dot matrix liquid crystal display module LM6038D can be used to scroll the body temperature of each patient; the P1 port is used to connect the single bus digital temperature sensor DS18B20; the P2 port is used for the field control circuit, including the button, Indicators, etc.; P3.0 (RXD) and P3.1 (TXD) of port 3 are used to communicate with the serial port of ZNE-100T. The system is powered by 5V.
2.2 Single bus temperature acquisition circuit design
The DS18B20 has a measurement range of -55 to +125 ° C; at -10 to +85 ° C, it has an accuracy of ±0.625 ° C and can be 0.1 ° C by special treatment.
Figure 2 DS18B20 circuit connection
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