1/ Possible? Yes. RFID works with a powered base station which sends a signal. RFID cards have unpowered resonators that respond at various frequencies. So office door broadcasts at, e.g. 13.553, 13.554, 13.555, 13.556 MHz, expects to see echoes at first, third and fourthhttps://twitter.com/Gormogons/status/989153092536033280 …
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2/ (i.e. basically it's just binary encoding - a door pad can emit at 10 frequencies, thus having 2^10 possible codes (one of them being 'no fob present)). If your office fob reflects 011010100101 and car fob reflects 1110101010101 both fobs present, car detects bitwise AND
7:56 AM - 25 Apr 2018
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