远程Temperature & Humidity实时监测system：智能化Environmental Monitoring解决方案

Summary

This article comprehensively elaborates on the technical architecture and implementation plan of a remote real-time temperature and humidity monitoring system. The system is based on modern measurement and control technology, integrating sensor networks, intelligent control platforms, and remote communication modules to build a bus based and modular monitoring system. It achieves precise collection, real-time transmission, intelligent analysis, and remote control of environmental parameters, providing efficient and reliable temperature and humidity management solutions for industrial production and household life.

1、 Background of the development of modern measurement and control technology

Traditional testing techniques mainly focus on static measurement, which is difficult to meet the real-time monitoring needs of dynamic parameters in the information society. With the maturity of electronic technology, semiconductor and computer technology, modern measurement and control technology has achieved continuous measurement and automatic control with high precision, sensitivity and response speed.

The complete modern measurement and control process covers five core links:Information collection(Sensor)Information transformation and transmission(Intermediate device)Information processing and analysis(Computer software)Information display record(Peripheral devices)Information regulation and control(Execution device). The deep integration of computer technology and testing technology has led to revolutionary breakthroughs in various aspects and propelled measurement and control technology into a new stage of development.

2、 System composition architecture

2.1 Core component description

The system adopts a bus structure and modular design, and each component can work independently or flexibly network:

1) Temperature and humidity collectorUsing temperature sensitive resistors and polymer humidity sensitive capacitors to achieve high-precision temperature and humidity measurement, supporting intelligent automatic calibration.

2) controllerReceive instructions from the monitoring platform, accurately control the start and stop of the execution mechanism, and have short-circuit protection and lightning protection modules.

3) Execution agencyIncluding environmental conditioning equipment such as heaters, refrigerators, humidifiers, dehumidifiers, etc.

4) Monitoring platformThe core hub of the system connects the collector with the upper computer. Provide real-time LCD display of time, channel number, temperature and humidity values, and equipment status (ventilation/dehumidification/malfunction, etc.), support32A measuring head is connected and equipped with power-off protection function.

5) Communication module: SupportRS232, RS485Bus or power line carrier communication is used to establish a data link between the platform and the upper computer.

6) Computer Management Control CenterRemote real-time monitoring of data from multiple platforms, presented in the form of tables and curves, with special color warnings for exceeding limits; Store historical data, support query, analysis, and export.

3、 Core characteristics of the system

1. Bus structureBuilding with blocks, multiple measuring and controlling devices share a single cable, and the measuring and controlling points can be flexibly expanded
2. lcdReal time display of time, temperature and humidity data, status information, and set values
3. Power-off memoryBuilt in backup battery, system parameters and data have power-off protection capability
4. Multi protocol communication: SupportRS232/485Multiple wired communication methods such as power line carrier and others
5. safeguardOverheating protection device+lightning protection module to ensure safe operation of the system
6. Easy maintenanceModular design, strong scalability, convenient and fast maintenance and networking
7. Remote accessCan access the computer network of the control center to achieve remote centralized management

4、 Characteristics of remote measurement and control terminal technology

The remote measurement and control terminal (RTU), as the core equipment on site, has the following technical advantages:

• Wide voltage power supply: 7V-30VWide range input, suitable for complex power supply environments
• Multi interface configuration: SupportRS232Dual routeRS485, Route 612PositionADAnalog input (0-30V/4-20mA), 6 relay outputs, 4 optocouplersIOcontrol
• Large capacity storage: Built in1Mbit-64Mbit SPI-FlashSupport long-term local data storage
• Accurate timing: Built inRTCReal time clock, automatic power-off timing, supports timed wake-up
• Low power designEfficient power management, suitable for scenarios with strict power consumption, extending battery life
• Protocol compatibility: Support standardsModbusProtocol (ASCII/RTU/TCP) and custom protocol, slave mode supports active feedback
• Diverse transmission: SupportGPRS/4GDual mode communication between mobile network and Ethernet
• GPRSpattern: Automatic reconnection upon disconnection, supports 6 concurrent servers, fixedIP/Domain name resolution/APNPrivate network addressing, supporting SMS configuration and phone wake-up
• Ethernet mode: 10/100MbpsAdaptive, supportTCP/UDP/PPP/ICMP/DNS/FTPWaiting for protocols, supporting network wake-up and remote firmware upgrades

5、 Application of Ethernet communication technology

Ethernet, as the most widely used LAN technology, plays a crucial role in systems

• Mature technology: From10MbpsThe development of coaxial cables100Mbps/1000MbpsTwisted pair/fiber optic technology and continuous innovation in switching technology have become the absolute mainstream of local area networks
• Widely applicableCovering fields such as office automation, securities, campus networks, industrial control systems, etc., it is perfectly compatible with integrated cabling systems
• Cost advantageThe degree of product industrialization is high, the market competition is sufficient, and the engineering cost is low (the increase in cost per household in smart communities is about yuan)600-800Stable performance
• Fully mature technology, no technical risks, strong real-time performance, stable and reliable performanceIn the monitoring system, Ethernet modules enable high-speed data access, suitable for large data transmission, theoretically unlimited number of nodes, customizable protocols, and support for local and remote parameter configuration and firmware upgrades.

6、 Software system design architecture

The system software adopts

Distributed master-slave architectureDivided into upper computer monitoring software and lower computer embedded programs:Upper computer

• Responsible for remote monitoring, data analysis, historical storage, abnormal alarms, and system configurationLower machine
• Responsible for real-time data collection, processing, display, and uploadingThe two communicate through serial ports or networks to form a complete measurement and control loop.

7、 Function of upper computer monitoring software

The upper computer software adopts modular design, with core functions including:

Serial communication

1. Configure communication parameters and establish a stable connection with the lower computer3D visualization
2. : ProvideThree display methods: 3D chart, curve trend chart, and data table, to visually present the environmental status3DData storage
3. Real time data (including maximum/minimum/average values) is stored in the database at user-defined intervals and can be exported as text filesIntelligent query
4. Support querying real-time and historical data based on time, channel, numerical range, and other conditions to generate trend curvesReport printing
5. Print real-time data reports and historical data reports as neededAbnormal alarm
6. Triggering sound and light alarm when temperature and humidity exceed the limit, supporting flexible threshold settingTriggering sound and light alarm when temperature and humidity exceed the limit, supporting flexible threshold setting
7. System settingsUsers can configure parameters such as measurement interval, alarm upper and lower limits, storage interval, login permissions, etc

The software consists of four core modules: the main program, interrupt reception, display subroutine, and data transfer, ensuring stable system operation.

8、 Lower level computer program design logic

The lower computer software adopts real-time monitoring and task decomposition mechanism:

• Monitoring moduleCoordinate alarm processing, control decision-making, information display, command processing, parameter setting, and information output
• Core moduleIncluding the main program, data acquisition subroutine, data processing subroutine, data transmission subroutine, and display subroutine

Workflow: The main program loops through various subroutines, the acquisition module reads sensor data at regular intervals, the processing module performs filtering and calibration, the sending module packages and uploads according to the protocol, and the display module drives the LCD screen for real-time display. When receiving commands from the upper computer, the interrupt mechanism ensures quick response.

9、 System application value and summary

The remote temperature and humidity monitoring system has successfully solved the key technical problem of long-distance communication. The system analyzed the characteristics of sensors and summarized four measurement structures: point, line, surface, and three-dimensional. Adopting control strategiesSmith-The fuzzy composite control algorithm has achieved dual configuration of serial port and network card by comparing multiple communication methods, forming a complete software and hardware solution.

The system not only provides precise environmental measurement and control methods for industrial production, but also creates conditions for improving the comfort of family life. Its modular, networked, and intelligent design represents the current development direction of industrial measurement and control technology, and has broad promotion value and application prospects.