20 Mar
2002
20 Mar
'02
1:37 p.m.
On Thu, 21 Mar 2002, Tony Duell wrote:
Wouldn't the guts from a current cheap mouse work nicely for that?
measure increase in the turbidity, BOD5 (Biochemical Oxygen Demand),
D.O.(Dissolved Oxygen), and suspended and dissolved solids in the waste
water relative to the water supply. Fecal coliforms would be overkill,
and hard to automate.
A company that I once worked for installed water quality monitoring
equipment at Coors'. They were having major problems with calibration
until they realized that they had just found a BIG leak in one of the
tanks - saved the brewery many hundreds of gallons.
Press-fit
roll spindle with shaft encoder attached to one serial port on
a PDP-11 running a backround job counting total turns, comparing against
Why use a
serial port for this? Why not one of the pulse-counter cards? I
think either the MNCKW (MInc clock module) or the KW11-K can be used for
this. Now how do
you tell if the previous occupant actually washed their
hands?
Detect water flow (trivial), reduction in weight of the soap (so you know
some has been used), and (temporary) incresse in weight of the towel (so
you know it's absorbed some water). OK, it doesn't actually prove that
the soap/water were used on the person's _hands_, but...