Robert Parker and Christina Sipes
Advisor: Dr. I. S. Ahn and Dr. D. R. Schertz
Fuzzy logic systems are especially useful in situations which require
smooth transition between a number of logic levels. In this application,
a fuzzy logic system is used to control heating/cooling, light level, and
soil moisture content in a greenhouse. Smooth transitions should provide
the plants with a more even growing environment which makes them grow better.
The heating/cooling system will use a temperature transducer sensor circuit
to measure the present temperature. The greenhouse heating/cooling system
will be modeled by a heating cone and muffin fan for heating and a large
single speed fan for cooling. Amount of light over time will be monitored
by a light sensing circuit using the CL502L photoresistor. When necessary,
light level will be increased using an artificial light source. Soil moisture
will be measured using a moisture probe. Moisture will be added using a
pressurized water tank connected through a shutoff valve to a misting nozzle.
The entire system will be implemented using an MC68HC11 microcontroller
and FIDE, a fuzzy logic software development tool.
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