Aiming at the wired and mechanical control methods of traditional lighting, this paper proposes an LED intelligent lighting control system based on Internet of Things (IoTThings, IOT) technology, embedding intelligent control module into LED lighting terminal, comprehensively using embedded technology, wireless sensor network, etc. The technology realizes intelligent, digital and wireless intelligent lighting control methods, and also has monitoring functions of environmental parameters such as ambient temperature and humidity and illuminance.
Overview
With the increasing popularity of LED lighting and the rapid development of mobile Internet technology, people are increasingly demanding the networking, intelligence, and energy saving of home life, and adopting wireless devices such as household appliances, lighting fixtures, and security alarms. Integrated into the control platform for intelligent control and intelligent management.
With the development of the Internet of Things (IOT) industry, smart LED lighting has become an important part of IOT.
This article provides intelligent LED lighting control system for the implementation of "Green Smart Lighting", using Internet of Things technology, embedded technology, etc. to realize wireless remote control of various lighting modes of LED lamps, and within the working range of LED lamps Ambient illumination and LED lamp working status are monitored in real time. At the same time, sensor technology is used to realize adaptive illumination adjustment of LED illumination and various combinations of light color conversion, thereby creating a comfortable, energy-saving and safe light environment. Figure 1 shows:
System hardware design
The hardware design of the system includes two parts: LED lamp control terminal and touch panel, which is used to realize intelligent lighting control of LED lamps; mainly includes control module, communication module, LED driver module, power module and so on.
(1) Hardware design of the main control unit
The main control unit of LED intelligent lighting control system is composed of two main parts: LED lighting control terminal and data acquisition terminal. The LED lamp control terminal is composed of ARM processor STM32 as the control core, which is composed of power supply circuit, peripheral circuit and illumination sensor. The data acquisition terminal is composed of temperature and humidity sensor, illuminance sensor and PM2.5 sensor. The schematic diagram of the hardware circuit is shown in Figure 2. Shown.
(2) Hardware design of touch panel
The hardware circuit design of the touch panel is based on the new generation ARM processor STM8S. The STM8S series processor comes with a touch software library design, which can realize capacitive touch sensing detection by using the charge transfer characteristics of the capacitor itself.
In the LED intelligent lighting control system, the switch button of the LED lighting fixture and the brightness adjustment of the scroll bar are mainly realized, and the circuit schematic diagram is shown in FIG.
(3) Design of ZigBee wireless communication module
In order to realize the centralized management and environmental monitoring functions of LED intelligent lighting system, this paper uses ZigBee wireless module based on Internet of Things to form a communication network.
The system's Zigbee wireless communication module uses the CC2530 module, and the TI CC2530 is a true system-on-chip (SoC) CMOS solution. The solution will improve performance and adapt to frequency-based applications, and its low cost, low power requirements.
It combines a high-performance 2.4GHz DSSS (Direct Sequence Spread Spectrum) RF transceiver core with an industrial-grade compact and efficient 8051 controller.
(4) Design of the power module
Considering that the design is applied in a home, and the power supply in the home is mainly 220V AC power supply, the power module is designed to use multiple discrete components to achieve different voltage output voltage regulator circuits, of which 3.3V and 5V power supply first The 220V power supply is converted into a 12V DC power supply by the switching power supply. The +12V to +5V uses the LM2576 series of regulators. The LM2576 is capable of driving a 3A load with excellent linearity and load regulation. The +5V power supply schematic is shown in Figure 4:
The +5V to +3.3V uses the AMS1117 voltage regulator. The AMS1117 can provide 1A of output current with a minimum input voltage of 1V and an output of +1V. After being regulated to +3.3V by +5V, it is supplied to the CPU and other chips. The schematic diagram of the +3.3V power supply is shown in Figure 5.
System software design
The software design of the system mainly realizes the collection and transmission of LED intelligent lighting control and environmental data. Through the ZigBee wireless communication network, the centralized management and data collection functions of LED lamps can be realized.
Conclusion
Through the study of relevant theoretical knowledge, this paper adjusts the brightness and color of LED lamps according to the characteristics of LEDs, and adds brightness sensor and human detection sensor to realize the intelligent, digital and networked LED lighting system. The design and structure of the system is reasonable, fully utilize the intelligent lighting technology to realize the demand of LED lighting application, and the expansion ability is good, which can effectively save energy, has practical promotion and application value, and has great market prospect.
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