1. Would it be possible to detect when somebody closes/opens/uses their keyfob (based on radio frequency) ? It is of course not the intention to hack the key. Just knowing when somebody has pushed a button on it.

    1. If so what could be the possible range and what hardware/software should be needed (what antenna?, Arduino, Raspberry pi, extra software or drivers etc...)

Thank you so much for your help.


That should be possible. Your best option is SDR (Software Defined Radio). It uses a standard PC or even a Raspberry Pi in combination with a DVB-T tv receiver as the radio.

A great starting point would be GNU Radio and its hardware section

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