INDOOR BLIND NAVIGATION USING VISIBLE LIGHT COMMUNICATION

Abstract : The Blind person navigation system can be used in house, hospitals where the blind people are living. The system consists of indoor transmitter section and blind person receiver section. The transmitter section is kept in the indoor and receiver section given to blind person. Whenever the Li-Fi receiver receives the data from transmitter section, it gives voice output using voice playback IC either that is hall or bed room. The entire function is managed by microcontroller. Wi Fi is great for general wireless coverage within buildings whereas Li-Fi is ideal for high density wireless data coverage in confined area and for relieving radio interference issues so the two technologies can be considered complimentary. The typical range of a common 802.11g network with standard equipment is o n the order of tens of meters. Range is insufficient for larger structures and needs repeaters .Costs for these items add up quickly. The speed on most wireless networks is typically 1 to 54 Mbps far slower than even the slowest common wired networks (100 Mbps up to several Gbps). Li-Fi technology is based on Light emitting diodes (LEDs) for the transfer of data. The data transfer is carried out with the help of all kinds of light, no matter the part of the spectrum that they belong. That is, the light can belong to the invisible, ultraviolet or the visible part of the spectrum. The speed of the internet is incredibly high (100 times faster than Wi-Fi) and in just a few minutes’ movies, games, music etc can be downloaded with the help

 EXISTING SYSTEM :

 An embedded system can be defined as a control system or computer system designed to perform a specific task. An embedded system can also be defined as a single purpose computer. • Perform a single task – Usually not general purpose • Increasingly high performance and real time constrained • Power, cost and reliability are important considerations • HW-SW systems – Software is used for more features and flexibility – Hardware (processors, ASICs, memory etc. are used for performance and security An embedded system is a specialized computer system that is part of a larger system or machine. Typically, an embedded system is housed on a single microprocessor board with the programs stored in ROM. Virtually all appliances like watches, microwaves, VCRs and cars have digital interface that utilize embedded systems. Some embedded systems include an operating system, but many are so specialized that the entire logic can be implemented as a single program.

 DISADVANTAGE :

 • Hard Real-Time Systems - systems with severe constraints on the timeliness of the response • Soft Real-Time Systems - systems which tolerate small variations in response times • Hybrid Real-Time Systems - systems which exhibit both hard and soft constraints on its performance

 PROPOSED SYSTEM :

 High brightness LED which act as a communication source. The transmitter unit is fitted to the wall/ceiling. In the transmitter the modulated information is transmitted through LED. The data is fed into LED light bulbs, it then sends data at rapid speeds to photodiode. If The Receiver detect the place means the Voice recoded circuit switch on the voice alerts.

 ADVANTAGE :

 The Proposed system’s block diagram consists of the following components. power supply will give operating to supply to microcontroller and other components. The LiFi transmitter is used to transmit a light signal to receiver section, Lifi reader is used to read the light signal which transmitted from LiFi transmitter.