piclist 2001\05\27\092929a >
Thread: detecting milk froth
face BY : mike@TakeThisOuTwhitewing.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:

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