Visual Aid System for Blind Persons using Proximity Sensors, Bluetooth technology and LabVIEW

Authors

Abhinav Kasliwal, Ramkrishna Sinha

Dept of Electronics and Instrumentation Engineering

BITS Pilani Goa Campus, Zuarinagar, Goa

Guided by Prof. A Amalin Prince (EEE Faculty, BITS Goa Pilani Campus)

Abstract

We introduce a signal manipulating control system that aids the visually challenged person to get idea of surrounding using its smart sensing and feedback giving mechanism. We are making use LABVIEW 8.2 with RT and FPGA modules.

The system, inspired by echolocation used by bats is designed to emit ultrasonic impulses generated by proximity sensors that have a minimum range of five meters. The output DC Voltage obtained from sensor and ADC is fed into another channel of NI 9201 I/P module. These signals are then compared with already known templates which were formed and stored when the device/sensor was at known distance from the obstacles. After comparing with these templates information is obtained about the distance of the person/device from the surrounding obstacles. Where there is no object, there is will be no feedback. Positive signals bouncing off objects are conveyed via blue tooth technology to a mobile device and then are translated in real time into sound frequencies. These results are made available to the blind person through headphones connected to the mobile to guide him/her accordingly to avoid obstacle.