Smart IoT Based Lighting System for Indoor Environment

Abstract

With the advent of new technologies and growing need of reliable and sophisticated ways to make machine to machine communication, the current concept of Internet has evolved from the traditional human interaction dependent events. Now it is possible to integrate a physical world device into the internet itself, essentially making it a smart object and therefore making it possible for inanimate objects to talk to each other, processing and exchanging data. This new concept is called Internet of Things (IoT). In present day IoT has found widespread application in the domain of Home Automation, Health Care, Productive Business, Logistics, Smart Cities, Intelligent Transportation etc.
In this work, an Intelligent Lighting System is developed which incorporates the concepts of IoT Home Automation. System comprises of a Gateway Node for Internet connectivity and master control, Wireless LED Nodes having high power LED, microcontroller, LED driver, wireless module and power supply, and Wireless Sensor Nodes. This system allows an end user to search for wireless LED nodes nearby, pair them and remotely perform ON/OFF and brightness control of LED lights. It also incorporates an Intrusion detection system which turns on the lights in a room upon motion detection. The system also captures usage data of the LEDs and user can retrieve and view usage statistics in graphical form.
Just the use of power efficient lights are not enough to effectively reduce overall electricity consumption bill, it can be greatly optimized by using a Smart Lighting System. It allows the user to calibrate when exactly a light should be on and at what brightness. Also it can make life more simple allowing full remote control over all the lights in the building. It can also detect intruders via the use of motion sensors and various other sensors can be used to add more features. Capturing usable data from the system can open ways for better optimization arrangements.
Raspberry Pi has been used as the Gateway Node and master control for the system. It also hosts the local webserver and database server and is connected to the Zigbee coordinator. With Arduino as the secondary controller and CAT4101 as the driver IC, and Zigbee as the wireless router, the LED node turns ON/OFF and adjusts brightness according to the command sent from ix raspberry pi. It also sends acknowledgement signals back to master control so that records are updated in the database. Wireless Sensor node sends motion detection signal to master control and accordingly master control sends command to turn on lights in the room. End user connects to the server as a client using an Android App and from there the LEDs can be controlled and usage data can be retrieved. Client pings the Server via php and Server sends respond in JSON format.