hi, i was wondering how i could use lm 555 timer to measure the time taken by a race car to pass it? i am using ad 633 IC which on modifications can be used as a divider. the length of the race car is the distance traveled by it. can anyone please tell me how i can display velocity in 3 digits using all these? i am stuck with how i could input distance and time to the ad 633 ic so that it can divide! please help me out!