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i want to know how can i use leds,ir leds,photo transistors to know the distance between two walls and the bot (like in micromouse)...also how can u use to it to detect the distance the presence od another bot(like in robowars)..does anybody has schematic diagram, for it
the basic priciple for distance calculation is by calculating the time between the pulse emitted from a transmitter and pulse received by the the receiver.
say if transmitter and receiver placed at same location and distance between the tranceiver and the object is 'd' then the distance travelled by the pulse is 2d .
knowing the light speed and time travelled , u can find out distance travelled.
the distance travelled devide by 2 is the distance of the object from the transceiver,
as far as i know, the distance measurement wont work if we try to calculate the time for the light to travel b/w the walls. since it will be in mocroseconds (even in picoseconds also). so accurately measuring it would be practically impossible.
since we cannot design counters to count such minute delays. better go for other alternatives like RF transmission and reception
Added after 1 hours 27 minutes:
see this article
h**p://dataweek.co.za/news.aspx?pklNewsId=8232&pklIssueId=282&pklCategoryID=39
this may be useful
Ivar, RF energy travels at only slightly slower than the speed of light in a vacuum. If you can measure it with RF signals, you can measure it with light signals.
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