Hello All.

This might sound like a weird one but maybe someone can help.

I'm trying to detect when some milk froth comes to the top of a cup for an
automatic cappuccino maker. The cup will always be the same size and will
have a coffee base already in it. What i want to do is place this cup under
a nozzle and press a button so that milk froth is poured into the cup till
it reaches a set height so that the cappuccino making is more of an
automated process.

Measuring weight is a no-goer since the froth is very light can vary in
density. Using some probes may be troublesome because the froth will stick
to them over time. Timing alone is also unsuitable. A distance measurement
device which can operate over the required range (5-10cm) might be an idea
but then again i don't know how well milk froth can be sensed since it is
not very solid.

Hope someone can help.

Regards, Kresho
Sydney, Aust.

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