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Speed_of_Sound * Time_Passed / 2 = Distance_from_Object343 m/s * .03 s / 2 = 5.145 m
Of coarse the fact that these sensors have no datasheets doesn't really help things at all...If you can, try and dig up some info about these, i tried a while ago and couldn't find any so i passed on buying them.
I know, its hard as hell to get decently priced ultrasonic sensors over here