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Previously developed air purifier programs written in c# serial PC program, used to read DC1700 laser dust sensor dust and sharp infrared sensors to do data comparison and integration, the program involves the SerialPort serial port using, NPOI library operation excel spreadsheets, data curve shows previously developed air purifier programs written in c# serial PC program, used to read DC1700 laser dust sensor dust and sharp infrared sensors to do data comparison and integration, the program involves the SerialPort serial port using, NPOI library operation excel spreadsheets, data curve display