From: curd@notformail.com   
      
   On Sat, 18 May 2019 22:35:09 +0200, Sjouke Burry wrote:   
      
      
   > Put the LDR in a 1 inch plastic tube,20 inch long and paint the tube   
   > inside with black flat paint(used for school boards).   
   > That will keep the ambient light out, and does not inhibit the laser   
   > beam.   
      
   LDR is too slow. He wants something that *briefly* interrupts the beam to   
   produce a 'meaningful' output from the detector. The 'burglar' is not   
   going to stand in front of the beam until the LDR has time to change   
   resistance.   
      
      
      
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