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My wife has a small shop, and she plays free licensed music. She can't legally play her own music when people outside of the family circle are present in the shop.

How can I automatically switch music when someone enters? I was thinking of some bluetooth door detector and some custom software, but can't seem to find either. I'm a software architect/dev and can write it if necessary, but I'd prefer to use some existing solution.

Any ideas on good hardware and software for this?

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Some kind of a simple switch circuit going into an AD converter monitoring signal levels, and into a COM port. Then a C program sends key presses, depending on the signal, into a media player with two playlists. The key press combination config in the media player could switch between playlists... –  Juha Untinen Jun 27 '13 at 9:56
    
I'm not into electronics, so this would take me days with an arduino. Looks like a multiple-K$ project if I count my time, can't afford it. –  ymajoros Jun 27 '13 at 10:26
    
call me lazy but a Pressure pad, wired direct to mouse button, reset after they leave. If your desperate to add wireless and possibility to fail more ways , a bluetooth mouse costs $7 tie it to the 4th or 5th button for a special macro using mouse macro software like x-mouse. Again easily tie a mouse into one of the light breaking door entry items, or magnetic reed switch assembly. Go wireless and you have to have batteries, then might want a charger for batts, and need a adapter and on and on, one wire direct sure solves a lot of stuff. –  Psycogeek Jun 27 '13 at 10:31
    
mmh, some interesting ideas here. Doesn't cost much. The mechanic setup looks difficult to me, though. Wireless is a must (can have a power supply but 4 metres from entrance to pc). –  ymajoros Jun 27 '13 at 10:38
    
Here's a similar question elsewhere : instructables.com/answers/… –  BrianAdkins Jun 27 '13 at 10:46

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