3、STC89C52isdesignedinthispaper.Inthissystem,one-wiredigitalthermometerDS18B20isusedtotransformanalogtemperaturesignaltodigitalsignal,throughfourreal-timedigitalofadigitalthermometertemperature.by setting the button,setthethermostattemperatureatthetime of operation, and d
4、igital display of the temperature.Single-chipMicrocomputerusedPIDcontrolalgorithmtoprocessthedatameasurementanddatasettings,andcalculatethePWMsignal,isoutputtedandmagnifiedtodriveasolidstaterelaysothatthepowerofheatcircuitisadjusted.Thusthetemperatureoftheobjectcanbecon