DHT21应用在AT89S52和stc89C52单片机例程.doc

****************************************************************////DHT21使用范例//单片机:AT89S52或STC89C52RC//功能://硬件连接:,DHT11的电源和地连接单片机的电源和地,单片机串口加MAX232连接电脑//公司:万瑞和电子//****************************************************************//#include<>#include<>//typedefunsignedcharU8;/*definedforunsigned8-bitsintegervariable无符号8位整型变量*/typedefsignedcharS8;/*definedforsigned8-bitsintegervariable有符号8位整型变量*/typedefunsignedintU16;/*definedforunsigned16-bitsintegervariable无符号16位整型变量*/typedefsignedintS16;/*definedforsigned16-bitsintegervariable有符号16位整型变量*/typedefunsignedlongU32;/*definedforunsigned32-bitsintegervariable无符号32位整型变量*/typedefsignedlongS32;/*definedforsigned32-bitsintegervariable有符号32位整型变量*/typedeffloatF32;/*singleprecisionfloatingpointvariable(32bits)单精度浮点数(32位长度)*/typedefdoubleF64;/*doubleprecisionfloatingpointvariable(64bits)双精度浮点数(64位长度)*///#defineucharunsignedchar#defineuintunsignedint#defineData_0_time4//----------------------------------------------////----------------IO口定义区--------------------////----------------------------------------------//sbitP2_0=P2^0;//----------------------------------------------////----------------定义区--------------------////----------------------------------------------//U8U8FLAG,k;U8U8count,U8temp;U8U8T_data_H,U8T_data_L,U8RH_data_H,U8RH_data_L,U8checkdata;U8U8T_data_H_temp,U8T_data_L_temp,U8