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distance measurement for toy car

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New Member
hi all,
i need to control the speed of the toy car..if my car is near by an obstacle i should know where exactly is the distance by a sensor.i hould have a range atleast 5m and it should look around al the sides(i mean it should have 360 degree sensing capability).i dont know which sensor to be used for this type of a problem.and actually i should reduce the speed of car.but later on i would like to implement it for actual cars also.........and propabily i need to know the distance and which direction(means if it is front,left,right or back).
expecting help...thanks in advance.
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