Hi Jay,

> We have two ways to design:
> (1) as engineers.
> (2) as businessmen.

a good engineer is always also a businessmen.
And so he must always decide between development costs and material costs.

For you, if you want to sell millions of gadgets, the development costs are unimportant.

But on the other side a studend want to build only 1 piece, very quick and without big experience.
So he can remember to the physics education: v = s / t
With inserting the real wheel size and the real timer ticks, he get the right result.
Also with some experience in C programming, this formula can direct be written as a C program.
Then the rest of the program can be written within some additional minutes (timer initialization and output the result to the LCD).


Peter