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Design a room environment monitoring system, to achieve room temperature detection, the procedure room environment monitoring system should achieve the following functions: (1) to detect ambient room temperature, and shows the development board. (2) If the temperature exceeds normal temperature range (temperature range of+15 ° C ~+25 ° C) alarm. (3) to achieve single-chip serial communication, and communication procedures and test the temperature of this process are combined. (4) to a PC serial port communication, the field temperature immediately displayed on the computer screen.