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I'm going to disagree with Marcus and say that you can probably get this to work, for some relaxed definition of "work". The detector you've drawn has poor selectivity, meaning it will detect quite a lot of stuff besides the intended signal. The inductor and capacitor provide some amount of filtering, but not nearly as good as you'd get in any ...


2

Well, your GPIO will need a defined voltage level and a couple of µA of drive strength, so completely "passive" is probably not really possible. Now, you'll need the following: Antenna potentially, amplification here Filtering potentially, amplification here Rectification Thresholding GPIO activation For antenna choices, see Texas Instrument'...


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