h a l f b a k e r y
The word "How?" springs to mind at this point.
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Blind person wears headphones where he/she receives alerts.
A digitized map of the city area where the person usually
walks, may be few city blocks, is stored in a microcontroller
device. This map stores very precise details such as widths of
footpaths, widths of road, curb dimensions, and names
shops etc. Traffic signal posts are fixed with radio
transmitters so that the person can be geo-located, like GPS.
This will be precise within inches. Blind person can receive
audio alerts in headphones while walking on street.
This can be in addition to ultrasonic stick.
||I had planned for a device for blind that just uses ultrasound and connected to the microcontroller. with a distance away from obstacle alert.
as here in my location we have to find a device that can be given below just 10 usd.
making a advanced one with voice guidance and detailed map with sensors needs lot of money and setup, though it can be made but would be quite expensive.
||10 usd price may be difficult to achieve.