Fuzzy LogicBasedTemperature Controller

Inthepresent paperafuzzy logic controller has beenenvisaged tomakeconditions adept toacertain temperature range. Thefuzzy logic controller actsasa roomtemperature controller. A microcontroller INTEL8031 isdesigned toactas fuzzy logic controller. Thissystem usesminimum hardware and achieves better performance thanaconventional PIDcontroller andcanbeapplicable invarious industrial processes where temperature control isvital I.INTRODUCTION Temperature basedequipment control isthebasic requirement indomestic aswellasinmanyindustrial applications. Thepaperdealswithtemperature based fan/heater controller systemimplementing fuzzylogic, comparing itwithconventional control circuits like anON- OFFcontrol orPIDcontrol inwhich either fan/heater runsat their maximumintensity whereas fuzzycontroller works according tothetemperature, controls thespeed offanorthe radiations fromtheheater andovercomes thelimitations of conventional control circuits. Soifthetemperature changes, thefanspeed ortheheater radiation adjusts tokeep thetemperature atthedesired level. II. CASESYSTEM: FANANDHEATER The conventional control of fan /heater using potentiometer isdiscrete andmanual andpowerconsumption issamewhether itisworking atitsmaximumorminimum rating. Intoday's world ofautomation, manual control has become major drawback with thecontrolling system Fuzzylogiccontrol adoptsintelligent control methodology, provides complete automation, replaces conventional logistics andintroduces spirit ofhumanthinking. Thecircuit hasthefollowing features: 1)Theroomarea where temperature hastobesensed can bevaried according totherangeoftemperature sensor (thermistor). 2)Itprovides precision based automatic control without