IR sensor, ultrasonic sensor, sonar sensor

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hi,
plz suggest me a good IR sensor available in India..
actually i am making an autonomous robot..
and i am sure wit the knowledge u all hav u can surely help me...
 
with relation to the main discussion, how is it an aid for the blind if they have to "read" and lcd screen to "see" the distance of an object in front of them?

haha just curious how that works.
 
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