Multisensor Strategies to Assist Blind People Using Gsm

Abstract:

The development of electronic sensing devices for the visually impaired requires knowledge of the needs and abilities of this class of people. In this project we present a rough analysis that can be used to properly define the criteria to be adopted for the design of such devices. In particular, attention will be focused on clear-path indicators, highlighting their role in orientation and mobility tasks. A new device belonging to this class is presented.

The detector is based on a multisensor strategy and adopts smart signal processing to provide the user with suitable information about the position of objects hindering his or her path. Experimental trials demonstrate the efficiency of the device developed. Introduction: About 1% of the human population is visually impaired, and amongst them about 10% is fully blind. One of the consequences of being visually impaired is the limitations in mobility. For global navigation, many tools already exist. For instance, in outdoor situations, handheld GPS systems for the blind are now available.

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These tools are not helpful for local navigation: local path planning and collision avoidance. The traditional tools, i. e. the guide dog and the cane, are appreciated tools, but nevertheless these tools do not adequately solve the local navigation problems. Guide dogs are not employable at a large scale (the training capacity in the Netherlands is about 100 guide dogs yearly; just enough to help about 1000 users). The cane is too restrictive. The goal of this research is to develop a wearable tool that assists the blind to accomplish his local navigation tasks.

Fig shows the architecture of the proposed tool. It consists of a sensory system controlled by the user. The primary data needed for local navigation is range data (which is not necessarily obtained from visual data alone; at this point, the type of sensors is still an open question). The mapper converts the range data into map data. The local map is the input to a warning system that transforms the map data into a form that is suitable for communication. In order to give the blind person freedom of movement, he must be able to control the focus of attention of the sensory system. For hat purpose, the tool must be provided with a man-machine interface Block diagram: Ultrasonic sensor Object detect sensor circuit Alarm MAX 232 Microcontroller At89C2051 GSM module RF Tx RF Encoder RF Rx Decoder DSP Speech IC Head phone Amplifier The ultimate goal of this project is to provide an electronic tool for the local navigation task of the blind. The tool must provide information about the direct surroundings of the blind to enable him to move around without collisions. We assume that, although mostly unknown, the environment does have some structure such as in an urban outdoor situation (e. . a street), or in an indoor situation: smooth floors, now and then a doorstep, stairs, walls, door openings and all kind of objects that possibly obstruct the passage. We start with three sensor types: stereovision, optical flow, and sonar. Preliminary research has shown that other types of sensors are also of interest, e. g. ladar, radar and infrared (detection of people and traffic). The system should be expandable such that the information from these types of sensors can be integrated easily in a later stage of the project.

Functioning overview of this Projects:

• Whenever the blind want go to particular place, before that he will set the path through mobile.
• Wherever he wants to go he has to carry this system.
• When he is going out his system will communicate to house through GSM.
• After receiving the data from blind system, it will communicate through voice using head phone.
• This same data will send to house by GSM.
• The house members can monitor the blind through mobile and which street, which area he is going.
• This system will support the blind and the children also.
• The ultrasonic will support the blind distance of each object.
• RF will support the path name, signal identification.

Advantages:

• Automation of all Customers to communicate through remote GSM using mobile.
• Save data using automatic control systems.
• Less cost to communicate.
• Less power to automate.
• Increase Safety.
• To increase n number of person to communicate and automate.
• Easy and fast identification system.

Future Scope:

The application of this project to help navigate people around unknown places has a large scope of development in the field of technologies it uses. With the advancement in the technology, readers are getting smaller and faster with greater ability to self program. Conclusion: We made an attempt to create a prototype for assisting blind people to sense the objects around them so that we can reduce the probability of collisions. More over by using more efficient and reliable components we can make a reliable one which effectively visualizes the blind people.

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