Design Of Intelligent Lighting System By Multi-Sensor And DALI Bus Base On IOT

With the rapid development of Internet of things technology today,people put forward the concept of smart home in order to pursue a more intelligent,fast and comfortable life.As an important part of smart home,intelligent lighting has become the first design direction for people to consider.In the traditional sense,lighting can only complete the switch operation,can't achieve the adaptive adjustment of light and make full use of lighting resources.With the gradual withdrawal of manual switches from the market,instead of wireless lighting control and other technologies.In order to solve these problems,an intelligent lighting control system is designed in this paper.The research of this paper includes the following aspects:1)First of all,this paper do research of the system structure,interface characteristics,wire rules,system scale,connectivity and operation of DALI,formulates a set of intelligent lighting system composed of controller,sensor and power supply.2)Through the analysis of Manchester coding mode in DALI protocol and PWM dimming principle,the control terminal of intelligent lighting system is designed.The data transmission frame format and instruction format of DALI are analyzed,the corresponding software program is compiled,and the control relationship between the control terminal and the mounted lamp is established.The control terminal can control 255 dimming levels of lamps and lanterns,and can also group and set up 64 mounted lamps and lanterns on DALI bus.3)In view of the problem that traditional lighting can not provide intelligent control,resulting in unnecessary waste of resources,this paper makes an improvement scheme on this basis.The hardware circuits of BH1750FVI illuminance sensor and PIR infrared detection sensor are designed respectively,and they are integrated into a sensing module.This module makes the DALI lamps and lanterns can detect the flow of personnel to achieve multi-area lighting autonomous switch control,and according to the indoor brightness to achieve adaptive constant illuminance control.4)In order to meet the needs of a variety of control schemes,this paper designs two kinds of control software,including PC and mobile.The main functions of the software include:basic lighting control,grouping scene query,weekly timing setting,device status reading and intelligent lighting wake-up.5)Finally,the feasibility of the whole system is verified by building the experimental platform,testing the output waveform of DALI interface,controlling the sensing circuit and so on.