5、nthesetlimit.Thelimitalarm.If thetemperatureexceedsthethreshold, will drivetherelaytowork. thesystemcircuitissimple,stable,highintegration,commissioningConvenient,highprecision,hassomepracticalvalue.[KeyWords]STC89C52;DHT11;1602LCDII陕西理工学院毕业设计目录1引言11.1课题背景11.2立题的目的及意义11.