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[Byte_Butcher]

Do you have any idea, what kind of sensors I can use to detect unexpected visitors?

These are nice little IR sensors. They even have serial interface. For outdoor use they'll obviously need some protection...

http://www.zilog.com/docs/devtools/PS0284.pdf
http://search.digikey.com/scripts/Dk...me=269-4710-ND


steve