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.

closed as off-topic by MichaelT, VE7JRO, Juraj, sempaiscuba Jun 3 at 21:23

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This question does not appear to be about Arduino, within the scope defined in the help center." – MichaelT, VE7JRO, Juraj, sempaiscuba, VE7JRO
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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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