5、goutsidetemperature by NTCthermistor.theMCUcontrolmoduleusingMSP430singlechipmicrocomputertorealizetheautomaticcontrolofthesystem.ThemoduleselectsNTCthermistortocollecttheexternaltemperatureandconvertstothelinearvoltagesignal.LinearvoltagesignalbytheA/DconversioncircuitmoduleintheAD7799comple