This application note describes the automation of two toilets, for conversion to sensor operated automatic flush.
A single sensor can control multiple toilets. In this application note, one sensor is used to control two toilets. The sensor is ceiling-mounted, directly above the partition between the two stalls. One sensor is needed for each two toilets. One sensor can also control several urinals.
so that it can use the appropriate amount of water to flush waste from the bowl (e.g. only a half-flush is required when only liquid waste is present).
The passive infrared (PIR)
sensor can distinguish waste left in the bowl (e.g. note the bright
areas in the bowl at left, from the warm urine) from other heat
sources, such as thermal buttprints on the seat,
and thermal footprints on the floor (at right) left by a barefoot user:
The PIR temperature sensor can also be used to prevent terrorism.
Here the thermal signature of contraband being passed beneath the
stall divider is detected automatically:
You can download a short time-lapse video (approx. 1.2 megabytes) showing the EXISTech passive infrared sensor in operation for the detection of contraband being passed beneath the stall divider (including the extracted frames from above).
Other criminal activity, such as failure to flush the toilet after use, can also be detected automatically. Here is a high speed capture of toilet usage with failure to flush. The temperature sensor can be used to either automate the flushing of the toilet ("automatic flush") or to simply detect failure to flush and notify the appropriate authorities.
EXISTech also has an intelligent sensor operated handwash faucet, as well as a sensor operated decontamination shower for processing victims of a terrorist attack.
Privacy (if such a concept is compatible with security, hygiene, and efficiency)...
See also ``Intelligent fixtures and systems'', S. Mann, ISAST LEONARDO, Vol. 36, No. 3, pp. 199-210, June 2003.