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From: David Higton <dave@davehigton.me.uk>
Newsgroups: comp.sys.raspberry-pi
Subject: Re: Need help with PI PICO...
Date: Tue, 26 Mar 2024 19:16:37 GMT
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Message-ID: <868ed1475b.DaveMeUK@BeagleBoard-xM>
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In message <utv5e7$29onh$2@dont-email.me>
          The Natural Philosopher <tnp@invalid.invalid> wrote:

> On 26/03/2024 18:16, Ahem A Rivet's Shot wrote:
> > On Tue, 26 Mar 2024 17:33:50 +0000 Jim H <invalid@invalid.invalid> wrote:
> > 
> > > Assuming the "oil" you're talking about is kerosene/heating fuel, the
> > > speed of sound is 1330 m/sec so 0.5cm takes 3.76 micro-sec.
> > 
> > 	I would have thought it's measuring the distance to the surface of
> > the oil from above the oil so it would be the speed of sound in air that
> > matters 300m/s.
> > 
> Correct, Mrs Shot. Anyway it's died within 30 minutes of going back on
> 'short echo'... So its definitely sensitive to that in some way.
> 
> I'll add more debug code tomorrow

Are you sure the sensor isn't malfunctioning as a result of being in
oil vapour?

David