Re: Need help with PI PICO...

On 2024-03-24, The Natural Philosopher <tnp@invalid.invalid> 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
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