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It is a fun project. But using the same principle you can make a electromagnetic gun.
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You are most welcome. I would be happy to answer any questions. Thanks
Hello Emmanuel2015:Thanks for your interest. You can calibrate the output signal to get an estimate of distance. However it may not be that accurate, as the reflectivity of the object also can affect the output amplitude. The delay is long, several hundred millisecond. This delay is intentionally introduced by using a low pass filter at the output of AD630. It filters out all AC and gives out pure DC proportional to the signal received by the receiver. To measure distance, I think it is better to use tim of flight measurement (TOF), which needs high speed electronics.
Hello Rafununu:Thanks for your comments. Yes, you are right, AD630 is acting as a demodulator.
Distant Object DetectionView Instructable »