From: look165@numericable.fr   
      
   For an alarm, do you care to 10ms for instance ?   
      
   Phil Hobbs a écrit le 15/05/2019 à 19:20 :   
   > On 5/15/19 1:14 PM, Look165 wrote:   
   >> Yes, it can.   
   >> A photodiode takes time to turn on or off, about the same a LDR takes.   
   >> LDR are reversible, standard photodiodes are only one way.   
   >>   
   >> Cursitor Doom a écrit le 15/05/2019 à 16:30 :   
   >>> On Wed, 15 May 2019 11:15:18 +0200, Look165 wrote:   
   >>>   
   >>>> A LDR reacts in some ms when the light's  wavelength is in the operating   
   >>>> range.   
   >>> You really can't beat a photodiode, though.   
   >>>   
   >>>   
   >>>   
   >>>   
   >>>   
   > A fast photodiode will respond in picoseconds.  Even slow ones are in   
   > the tens-of-nanosecond range if used with the right transimpedance amp.   
   >   
   > They're also highly linear and stable, neither of which is true of CdS   
   > cells.   
   >   
   > Cheers   
   >   
   > Phil Hobbs   
   >   
      
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