4、ircuit.DHT11digitaltemperatureandhumiditysensorstotheacquisitionoftemperatureandhumiditydatatothemicrocontroller.Theprocessingofsinglechip.AccuratedisplayedontheLCDpanel.Andthetemperatureandhumidityonthesetlimit.Thelimitalarm.If thetemperatureexceedsthethreshold, will drivetherelaytowork. thesystem