利用温度传感器18B20检测温度，并用数码管显示。通过按键设置最高和最低温度报警限制，超过或低于设定值通过蜂鸣器报警。-The use of temperature sensor 18B20 detection temperature with digital display. Button to set the minimum and maximum temperature alarm limit, above or below the set value by buzzer alarm.