HB100 radar module

[sayzer]

HB100 speed measurement is explained here:

From the first page:
......IF the target is moving straight toward or away from HB100 (Ft = 10.525 Ghz) the formula is simplified to:
Fd = 19.49V (Velocity in km/hour) or 31.36V (V in mile per hour)

So we are going to use the simplest of the two, we know the doppler frequency, and we want to find the speed.
V = Fd/31.36 … What this really means thou, is for ever 31.36Hz will equal 1 MPH
So if the IF Frequency is 31.36 then the speed of the target is 1 MPH. Easy!

And a IF Frequency of say 400Hz would be about 13Mph if you round it up.

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So if you read the frequeny with a Timer running in the background, then there it is your result.