变风量空调系统多参数测量方法pdf,变风量空调系统多参数测量方法15mAT89C52 TTL PC RS232 SHT1I MAX232E SHTII TTL RS232 SHTIl SHT11 SCK vO DATA VO Cl+ ⅤCC GND V+ MAX232 RS 232C TIout n十 O n Rlin RXD TXD IO RXD Tlin SHTII 1n Rout GND GND 图3PC与单片机的硬件连接电路图 2 3 SHT11 SCK P1.0, DATA P1.1.