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Re: Automatic flushers

On Fri, 19 Oct 2001, Paul O. Johnson wrote (among other things):

The limited battery energy prevented the use of fast IR
pulses and a power-hogging MPU chip (at least it did so when using the
chips available back in 1994).

The point of the MPU was to provide an adaptive sensor which could "learn"
the normal background changes caused by passersby, stall doors opening,
buildup of dirt on the window, etc.

Sorry, but what does MPU stand for?