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I am an electronics beginner but want to make two devices that can detect if they are near each other.

So if the devices enter a radius of less than 2 meters of each other they will both trigger an audible alarm

I need the devices to be as small as possible, i would use the term "micro" even, and be able to be recharged or even that fancy "wireless" recharging. The devices only need to be active for at least 5 days or longer

Thank you

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    \$\begingroup\$ Do they have line of sight between them? Are they fixed in orientation? \$\endgroup\$ – Oli Glaser Feb 26 '13 at 7:57
  • \$\begingroup\$ @OliGlaser - Not Always line of sight and orientation could change. \$\endgroup\$ – user389391 Feb 27 '13 at 8:35
  • \$\begingroup\$ @Peterj - Actually it must be under 2M. \$\endgroup\$ – user389391 Feb 27 '13 at 8:36
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Could an Arduino Near Field Communication (NFC) shield do the job? Or a RFID shield. As an example: NFC Shield V2.0 of Seeed But there must be other once in the market.

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  • \$\begingroup\$ Thanks but WAY to big :-) Needs to be smaller than 1/4 of a credit card i think \$\endgroup\$ – user389391 Feb 27 '13 at 1:00

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