From: curd@notformail.com   
      
   On Fri, 17 May 2019 07:06:03 -0400, default wrote:   
      
   > Most of the garden variety of PIR detectors have a wide field of   
   > coverage, but you can apply baffles to narrow the field, or find one   
   > that has a narrow field - usually combined with greater detection range.   
   >  Only way to tell is to get one and play with it.   
      
   IME they're a total NIGHTMARE. Fine for inside use, but hopeless for   
   anything out in the open. FAR too many false alarms. Give me the laser/   
   photodiode combo any day - inside or out.   
      
      
      
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    * Origin: you cannot sedate... all the things you hate (1:229/2)