New lower price for Axon II ($78) and Axon Mote ($58).
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Perhaps you can get three of them and triangulate the signals?
Why three ? For triangulation, only one transmitter and, at most 2 receivers should be used (and 1 rx should be plenty if used correctly).
with 2 receivers you always get 2 possible solutions.to take a trivial example, let us say the transmitter was an equal distance from 2 receivers, you would need a 3rd to be able to tell if the transmitter was in front or behind the receivers.with only 2 receivers the only set of solutions where you would know exactly where the transmitter is would be when it is exactly in line with the 2 receivers.i presume your method for only one receiver involves a directional aerial?
does the PIR sensor give a analog signal to the micro based on distance away from warm object?
And your example: "when it is exactly in line with the 2 receivers" wouldn't give an unambiguous reading either, with the method that you seem to suggest.
Soren,you were the one who specified triangulation not me:
QuoteWhy three ? For triangulation, only one transmitter and, at most 2 receivers should be used (and 1 rx should be plenty if used correctly).you appear to be changing you mind about triangulation being possible with 2 receivers too...
Not that I doubt it can be done but where is the bottle neck in the sampling rate? is it wavelength limited or more the speed of the muxing?