Design of Temperature and Humidity Remote Monitoring System Based on STC89C52 Single Chip Computer

Single chip microcomputer STM32L151CCU6

L0504-Murata muRata common mode inductor 90Ω 150mA

Temperature and humidity sensor STC89C52

Summary

In order to solve the problem of real-time monitoring of the temperature and humidity of the unmanned platform equipment cabin, the STC89C52 single-chip microcomputer is used as the control core, and Lab-VIEW is used as the development platform. The design scheme of the temperature and humidity remote monitoring system for the unmanned aerial platform is proposed. The system can monitor the temperature and humidity of the unmanned platform equipment cabin during the mission in real time. When the temperature and humidity of the equipment cabin exceed the permitted range, the system will send an alarm message to remind the operator to take appropriate measures. It can automatically adjust the temperature and humidity in the cabin to ensure that the mission equipment in the cabin is always in a good working environment and ensure the validity of the data collected during the test.

0 Preface

Unmanned aerial platforms play an increasingly important role in the testing of electronic information equipment. The temperature and humidity of the environment in which the task equipment is located during the equipment test is an important technical parameter, which affects whether the task equipment can work normally. It has long been possible to rely on meteorological observations on the ground to monitor it, and it is impossible to monitor the temperature and humidity of the unmanned aerial platform equipment cabin in flight state in real time and effectively, so it is difficult to guarantee the data collected in each test. Effectiveness.

In order to solve the above problems, this paper designs a remote monitoring system for the temperature and humidity of the equipment cabin of the unmanned aerial platform. The temperature and humidity sensor measures the temperature and humidity of the equipment cabin and is processed and packaged by the single-chip computer. It is transmitted to the ground command cabin and then transmitted to the command post via Ethernet. The equipment operator uses the monitoring software to monitor the temperature and humidity of the equipment cabin in real time. Once the temperature and humidity of the equipment cabin exceeds the permitted range, the monitoring system will send an alarm message to remind the operator to take appropriate measures and automatically adjust the cabin. Temperature and humidity are within the normal range to ensure the validity of the collected test data.

1 system structure and overall design

The remote monitoring system for the temperature and humidity of the equipment cabin of the unmanned aerial platform can be divided into two parts: airborne and ground. The overall structure of the system is shown in Figure 1. The airborne part is mainly composed of power module, core control module, temperature and humidity sensor, digital tube display module, keyboard module, temperature and humidity adjustment system and communication module. The ground part is installed by the monitoring software installed in the ground command cabin and the command post. constitute. In the system, the core control module collects and calculates the temperature and humidity parameters of the unmanned platform equipment cabin in real time through the temperature and humidity sensor, displays the real-time display through the digital tube display module, and packages the temperature and humidity data to the communication module. The module is transmitted to the ground command cabin through the ground-to-air link and then transmitted to the command post via Ethernet. Finally, the operator conducts the real-time temperature and humidity parameters of the equipment cabin through the ground monitoring software on the ground command cabin and the command post. monitor.

1.1 Power Module

The power module provides high quality and stable voltage for the normal operation of the core control module, digital tube display module, keyboard module, communication module and temperature and humidity adjustment system of the airborne part.

1.2 core control module

The core control module of the airborne part of the system uses the STC89C52 microcontroller. The STC89C52 microcontroller is a low-power, high-performance CMOS 8-bit microcontroller with a smart 8-bit CPU and 8 KB in-system programmable FLASH memory, making the STC89C52 highly flexible and ultra-efficient for the core control of the system. solution.

1.3 Temperature and Humidity Sensor

The temperature and humidity sensor is mainly responsible for collecting the temperature and humidity physical data of the equipment cabin in real time and converting it into an electrical signal. The performance of the sensor directly determines the accuracy, sensitivity and measurement range of the monitoring system. The system uses a SHT10 digital temperature and humidity sensor, the main performance indicators are as follows: humidity measurement range: 0 ~ 100% RH; temperature measurement range: -40 ~ 123.8 ° C; humidity measurement accuracy: ± 4.5% RH; temperature measurement accuracy: ±0.5 °C; low power consumption of 80 μW to meet system monitoring requirements.

1.4 keyboard module

The keyboard module is convenient for the user to manually set the temperature and humidity range of the equipment cabin and realize the functions of self-test and reset of the system when the user adjusts the ground.

1.5 digital tube display module

The digital tube display module is mainly used to display the temperature and humidity parameters of the equipment compartment, which can facilitate the real-time monitoring of temperature and humidity when the operator performs ground debugging on the unmanned aerial platform. The module is composed of a driving circuit and a digital tube. The driving circuit completes the latching of the temperature and humidity data and the selection and selection of the digital tube, and the digital tube is used for real-time display of the temperature and humidity data.

1.6 Communication Module

The communication module is an interface for data communication between the core control module and the ground-to-air link, and is responsible for transmitting the temperature and humidity data packaged and sent by the core control module to the ground-to-air link, and is also responsible for transmitting the control command of the ground monitoring software to the core control. Module.

1.7 Temperature and Humidity Control System

When the temperature and humidity of the equipment compartment exceeds the preset range of the equipment operator, the temperature and humidity adjustment system works under the control of the core control module, and automatically adjusts the temperature and humidity of the equipment compartment to the permitted range to ensure that the mission equipment is in the specified Work under temperature and humidity conditions.

2 system software design

2.1 Airborne core control module software design

The running process of the airborne core control module software is shown in Figure 2. The software uses C language programming to achieve various functions. STC89C52 single-chip microcomputer as the control core mainly realizes control temperature and humidity acquisition and processing, digital tube display, keyboard input, control of temperature and humidity adjustment system and package temperature and humidity data for remote wireless transmission. A complete workflow is as follows: After the system is initialized, the core control module reads the range of temperature and humidity parameters uploaded by the ground-to-air link or preset by the ground operator, and then measures the temperature and humidity parameters to confirm the temperature and humidity after the measurement is correct. Value and display in real time through the digital tube. If the temperature and humidity value of the equipment compartment exceeds the range set by the ground operator, the core control module issues a command to activate the temperature and humidity adjustment system to adjust the temperature and humidity of the equipment compartment in real time until it is within the permitted range. Finally, the core control module saves and transmits the measured equipment cabin temperature and humidity values ​​to the buffer, and the communication module transmits the data to the ground-to-air link and then to the ground command cabin.

2.2 Ground monitoring software design

The ground monitoring software is written in LabVIEW as the programming environment. The monitoring computer collects the real-time data through the serial port and displays the temperature and humidity data transmitted by the ground-to-air link in a dynamic curve. Once the temperature or humidity value of the equipment compartment exceeds the range of temperature and humidity set by the ground operator, the corresponding warning light in the monitoring software will light up to remind the ground operator to take corresponding measures, and the temperature and humidity of the airborne part at this time. The adjustment system starts working under the control of the core control module, automatically adjusting the temperature and humidity in the equipment compartment until it is within the permitted range. The monitoring software has the characteristics of friendly interface design and simple operation. The software design interface is shown in Figure 3.

The system uses the Web server technology provided by LabVIEW to transplant the front panel of the ground command cabin VI program to the command post computer. After the command station computer obtains control, the operator can remotely operate the monitoring software at the command post. Real-time monitoring of the temperature and humidity parameter information of the equipment cabin of the unmanned platform is realized by the test commander.

3 Conclusion

This paper designs a remote monitoring system for temperature and humidity of the equipment cabin of the unmanned aerial platform based on STC89C52 microcontroller and Lab-VIEW. The system hardware composition is simple and compact, and the ground monitoring software interface design is friendly and easy to operate. Uninterrupted real-time dynamic remote monitoring of the temperature and humidity of the equipment compartment of the unmanned aerial platform can be realized during the equipment test, which helps to improve the validity of the data collected in the test.