From: tnp@invalid.invalid   
      
   On 29/03/2024 15:02, Michael Schwingen wrote:   
   > On 2024-03-25, The Natural Philosopher  wrote:   
   >>   
   >> I have noticed that with absoluteley no change in sensor location I get   
   >> up to ± 0.5cm variation in delay.   
   >   
   > Sounds reasonable (or even quite good) for such a cheap sensor. Does yours   
   > come with a datasheet that specifies accuracy limits?   
   >   
   It *is* the Sparkfun module.   
      
   > The datasheet on the Sparkfun website claims "the ranging accuracy can reach   
   > to 3mm", but does not give any guaranteed limits - and I believe there are   
   > lots of clone parts that may be even worse.   
      
   In general I am getting *repeatibility* now to a lot less than that, and   
   it has been known, (pointed out of the window) to detect large objects   
   at many many metres.   
      
   It is certainly more than good enough for measuring from 0-1.5 metres or   
   so. to a sorta 10% accuracy.   
      
      
      
   --   
   "And if the blind lead the blind, both shall fall into the ditch".   
      
   Gospel of St. Mathew 15:14   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)