piclist 2001\05\27\092929a >
Thread: detecting milk froth
www.piclist.com/techref/index.htm?key=detecting+milk+froth
flavicon
face BY : mikespam_OUT@@spam@whitewing.co.uk



As froth ought to be conductive, my first thought would be to use a
capacitive proximity sensor. This should be reasonably immune to
'gunking up' which could be a problem for optical solutions. Offset problems caused by surface contamination could be eliminated by
looking for the rate of rise instead of an absolute threshold -
capacitive sensors tend to have nonlinear distance-to-output curves,
which should help. The size of the cup should give you plenty of
sensor area (e.g. a disc round the nozzle) to minimise stray
capacitance effects.

A sealed ultrasonic sensor may work, but I'd expect something light
like froth to absorb quite a lot of sound.

On Sun, 27 May 2001 11:45:28 +1000, you wrote:

{Quote hidden}

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads


<65p1htofjl7ird5kjkjh6u38tjo2qtm7ca@4ax.com> quoted-printable

In reply to: <LPBBKPOKDJDPMHIALNLJGELGCLAA.kresho@advancedtechnika.com.au>
See also: www.piclist.com/techref/index.htm?key=detecting+milk+froth
Reply You must be a member of the piclist mailing list (not only a www.piclist.com member) to post to the piclist. This form requires JavaScript and a browser/email client that can handle form mailto: posts.
Subject (change) detecting milk froth

month overview.

new search...