With the development of the economy and the advancement of science and technology, people have put forward higher requirements for the energy-saving and scientific management convenience of lighting appliances, making the position of lighting control in the field of smart home more and more important. The use of intelligent lighting control systems can better reflect the advantages of energy saving and management, and improve the scientific lighting level of the family. The lighting mode of ordinary households is to turn off the lights during the day and turn on the lights at night. After adopting the intelligent lighting control system, the user can intelligently illuminate according to the number of households in different occasions and different times, and automatically turn on the lighting system and adjust its brightness when needed; The system can also make full use of natural light, while ensuring the necessary lighting, effectively reducing the working time of the lamps, saving unnecessary energy expenditure and prolonging the service life of the lamps.
The intelligent lighting control system can reduce the use time of the lamps and save energy. Extensive economic growth will lead to scarce resources. Therefore, it is imperative to adjust the industrial structure. It is of great significance to promote intelligent lighting systems in the lighting industry. In this paper, the shortcomings of the current method of adjusting the brightness of LED lights based on indoor illumination are added. The human body infrared sensing module and temperature detecting module are added to the lighting system. The temperature detection module can display the indoor temperature in real time, and the human body infrared module can sense whether there is someone in the room. When the infrared sensor module detects that there is no one in the room, the system forcibly disconnects the power supply, which can avoid the energy waste caused by the family owner forgetting to turn off the intelligent lighting system.
1, the overall introduction of the systemThe system is mainly composed of APDS-9008 illuminance detection sensor, DS18B20 temperature detection sensor, LCD display, STM32L151, power module and human body infrared.
1.1, MCU introductionUsing ST low-power L series MCU - STM32L151 as the main control chip of this system, its characteristics are as follows:
1) Working conditions:
Operating power range: 1.65 ~ 3.6V or 1.8 ~ 3.6V
Temperature range: -40 to 85 ° C
2) Low power consumption
Sleep mode, low power operation (only 9μA at 32kHz), low power sleep (4.4μA)
Ultra low leakage per I/O: 50nA
Fast wake from stop: 8μs
1.2, APDS-9008 illuminance detection sensor module introductionThe APDS-9008 provides accurate photometric detection under a wide range of ambient light conditions. It has a light sensor with a spectral response close to the CIE standard. Figure 1 is a block diagram of the APDS-9008.
Figure 1 APDS-9008 module diagram
1.3, HC-SR501 human body infrared moduleThe HC-SR501 is an automatic control module based on infrared technology. It is designed with LHI778 probe, featuring high sensitivity, high reliability and ultra-low voltage operation mode. The technical parameters are as follows:
Operating voltage: DC5 ~ 20V; static power consumption: 65μA; level output: high 3.3V, low 0V; delay time: adjustable (0.3 ~ 18s); blocking time: 0.2s; trigger mode: L Non-repeatable, H repeatable, default value is H; sensing range: less than 120° cone angle, less than 7m; working temperature: -15～+70°C; PCB dimension: 32mm&TImes; 24mm, screw hole distance 28mm, screw hole 2mm , Inductive lens size: Diameter: 23mm (default)
Figure 2 HC-SR501 module diagram
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