Re: Need help with PI PICO...

On 29/03/2024 15:02, Michael Schwingen wrote:

On 2024-03-25, The Natural Philosopher <tnp@invalid.invalid> 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