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   On 2024-03-24, The Natural Philosopher  wrote:   
   >   
   > ...unless, thinking a bit more, the pulse is so short it comes *and*   
   > goes inside that loop, as you suggested.. it certainly should *not*  be,   
   > as even on a few cm of target distance, its hundreds of microseconds (i   
   > make it 58µs per cm roughly)   
      
   Start a hardware timer when sending the pulse, and set up an interrupt on   
   the input with the return pulse. In the interrupt handler, read the timer   
   value and set a flag for the main routine that the measurement is complete.   
      
   If you add a timer interrupt to periodically send the start pulse, the whole   
   measurement operation runs in parallel to whatever the main program is   
   doing, without blocking anything.   
      
   cu   
   michael   
   --   
   Some people have no respect of age unless it is bottled.   
      
   --- SoupGate-Win32 v1.05   
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