A review of technology for implementing real-time temperature and humidity monitoring system using PHP

With the development of modern science and technology, people's demand for environmental monitoring and control continues to increase. In production, scientific research and daily life, the monitoring of temperature and humidity is particularly important. In recent years, the real-time temperature and humidity monitoring system based on PHP language has become a research hotspot due to its openness, flexibility, scalability and other advantages. This article will provide an overview of related technologies in this field.

1. Sensor data collection

Sensors are an important part of the temperature and humidity monitoring system and are used to collect temperature and humidity data in the environment. Currently, commonly used sensors on the market include DHT11, DHT22, etc. Among them, DHT11 is a digital output signal module integrated with a temperature and humidity sensor, using a single bus communication protocol. DHT22 is a digital temperature and humidity sensor that uses serial digital signal output.

There are two main ways to collect sensor data: serial communication and GPIO reading. Serial communication requires the use of a serial communication library, such as php_serial, etc. GPIO reading requires connecting the pins of the Raspberry Pi to the pins of the sensor, and obtaining sensor data by reading the level changes of the GPIO port.

2. Data Storage and Processing

After obtaining the temperature and humidity data, it needs to be stored in the database for better management and analysis. MySQL is a commonly used relational database management system that can be connected and operated through PHP's MySQLi extension library. You can create a table named temperature to store temperature and humidity data. The table structure is as follows:

CREATE TABLE temperature (

id INT(11) NOT NULL AUTO_INCREMENT,
temperature FLOAT(6,2) NOT NULL,
humidity FLOAT(6,2) NOT NULL,
created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
PRIMARY KEY (id)

);

In addition to data storage, temperature The processing of humidity data is also important. Usually, we need to monitor and analyze it in real time. You can use open source charting libraries such as Chart.js to draw real-time charts to visually display temperature and humidity data. By regularly updating charts, real-time monitoring functions can be achieved.

3. Web interface design

The Web interface is the main way for users to interact with the temperature and humidity monitoring system, so the design of the Web interface is also very important. You can use front-end frameworks such as Bootstrap to quickly build a beautiful web interface that is compatible with various devices. At the same time, JavaScript libraries such as jQuery need to be introduced to achieve some interactive effects.

On the Web interface, the following functions need to be provided:

1. Display and monitoring of real-time temperature and humidity data;
2. Query and view of historical temperature and humidity data, you can Achieved through date range, time period and other conditions;
3. Display of real-time charts to visually display temperature and humidity change trends;
4. Export and print functions of temperature and humidity data.

4. System deployment and optimization

The system deployment process mainly includes hardware selection, software installation, configuration, etc. When selecting hardware, you need to pay attention to the type and number of sensors, the performance and stability of the Raspberry Pi, etc. In terms of software installation, you need to pay attention to the version and compatibility of PHP, Apache, MySQL and other related software. During configuration, firewall settings, virtual host configuration, database optimization, etc. need to be performed to ensure that the system can operate normally.

During the system operation, in order to improve the stability and response speed of the system, some optimization work needs to be carried out. For example, use php-opcache to accelerate the PHP interpreter, use CDN to accelerate, optimize SQL statements, etc.

Summary

Compared with traditional monitoring methods, the real-time temperature and humidity monitoring system based on PHP language has the advantages of openness, flexibility, and scalability. This article reviews related technologies in this field, including sensor data collection, data storage and processing, Web interface design, system deployment and optimization, etc. I hope it will be of some reference to relevant developers and researchers.

The above is the detailed content of A review of technology for implementing real-time temperature and humidity monitoring system using PHP. For more information, please follow other related articles on the PHP Chinese website!