Understanding Smart Sensors - Nomads.usp

Control Techniques 157Supplied byapplicationexpertInputmembershipfunctionsSystem inputsFuzzificationFuzzyinferenceprocessorFuzzy inputsRulesOutputmembershipfunctionsRuleevaluationDefuzzificationFuzzy ouputsRun timecalculationresultsSystem outputsFigure 7.5 FIU.Fuzzy logic allows 8-bit MCUs to perform tasks that otherwise may haverequired a more powerful MCU, such as a RISC processor.Fuzzy logic has been used with multiple sensors to produce a mobile securityrobot for evaluating the environment in an art gallery [13]. As shown inFigure 7.6, the fuzzy logic certainty engine in the robot weighs multiple variables,creates a composite picture from data supplied by the sensors, and performsreal-time threat identification and assessment. The robot is able toanalyze data based on their location, the time of day, historical trends, andexternal conditions. A wide range of safety threats detrimental to art objects hasbeen identified by the robot during a 36-month evaluation. An obvious extensionof this technology is air quality assessment for conditions harmful tohumans.7.4 Neural NetworksUnlike fuzzy logic, neural networks allow the system instead of an expert todefine the rules. By definition, a neural network is a collection of independentprocessing nodes that solve problems by communicating with one another in a