DS18B20温度计，温度测量范围0~99.9摄氏度

可设置上限报警温度、下限报警温度

即高于上限值或者低于下限值时蜂鸣器报警

默认上限报警温度为38℃、默认下限报警温度为5℃

报警值可设置范围：最低上限报警值等于当前下限报警值

最高下限报警值等于当前上限报警值

将下限报警值调为0时为关闭下限报警功能-DS18B20 thermometer, temperature measuring range upper limit alarm temperature can be set from 0 to 99.9 degrees Celsius, the lower limit alarm temperature that is higher than the upper limit or below the lower limit, the buzzer alarm a default limit alarm temperature is 38 ° C, the default lower limit alarm temperature of 5 ℃ alarm value setting range: minimum limit alarm value is equal to the current limit alarm value lower limit alarm value is equal to the current limit alarm value lower limit alarm value adjustment for 0:00 to close the lower limit alarm function