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<DIV><FONT face=Arial size=2>Greetings! I'm interested in making an alarm system 
using PICs. I'd like to know what sensors are available in the market that could 
detect human presence. I'm interested in all kinds of them, even sound sensors. 
Is this stuff usually very expensive? Please let me know. Thanks in advance, 
Argiris.</FONT></DIV></BODY></HTML>

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