基于51单片机智能风扇散热系统源程序

#include <STC12C5A60S2.H> #include <intrins.h> #define TRUE 1 #define FALSE 0 #define DHT11_WAIT_TIME_OUT_INIT_VALUE 64536 sbit D = P2^6; //DHT11 Data Line unsigned char byHumidityValue,byTemperatureValue; //求得的湿度、温度数据 unsigned char dataBuf[5]= {0}; extern unsigned char dis1[16]; void Delay20us() //@11.0592MHz { unsigned char i; _nop_(); i = 52; while (--i); } void Delay10us() //@11.0592MHz { unsigned char i; _nop_(); _nop_(); _nop_(); i = 24; while(--i); } void Delay18ms() //@11.0592MHz { unsigned char i, j, k; _nop_(); _nop_(); i = 1; j = 194; k = 159; do { do { while (--k); } while (--j); } while (--i); } unsigned char ReadDHT11(void) { unsigned char i=0,x,bychecksum=0; unsigned short data wCounter; D=0; Delay18ms(); //>18ms D=1; Delay20us(); Delay10us(); //20~40us Delay20us(); Delay10us(); wCounter = 2; //while(!D) while((!D)&&(wCounter++)) { ; //80us L响应信号 } if(wCounter==1) { //等待超时，DHT11没有响应 return FALSE; } Delay20us(); Delay10us(); wCounter = DHT11_WAIT_TIME_OUT_INIT_VALUE; //while(D); //80us H while((D)&&(wCounter++)) { ; //80us H } if(wCounter==1) { return FALSE; } Delay20us(); Delay10us(); // while(!D); //50us L 数据开始标志 wCounter = DHT11_WAIT_TIME_OUT_INIT_VALUE; while((!D)&&(wCounter++)) { ; } if(wCounter==1) { return FALSE; } for(i=0; i<40; i++) { Delay20us(); Delay10us(); if(D) { //1 x=1; //while(D); wCounter = DHT11_WAIT_TIME_OUT_INIT_VALUE; while((D)&&(wCounter++)) { ; } if(wCounter==1) { return FALSE; } Delay20us(); Delay10us(); //while(!D); wCounter = DHT11_WAIT_TIME_OUT_INIT_VALUE; while((!D)&&(wCounter++)) { ; } if(wCounter==1) { return FALSE; } } else { //0 x=0; //while(!D); wCounter = DHT11_WAIT_TIME_OUT_INIT_VALUE; while((!D)&&(wCounter++)) { ; } if(wCounter==1) { return FALSE; } } dataBuf[i/8]<<=1; dataBuf[i/8]|=x; } for(i=0; i<4; i++) { bychecksum = bychecksum+dataBuf[i]; } if(bychecksum==dataBuf[4]) { if((dataBuf[0]>100)||(dataBuf[2]>50)) { return FALSE; } else { return TRUE;//检查和正确，保存温湿度 } } else { return FALSE; } } void ReadHumidityTemperature(void) { if(ReadDHT11()==TRUE) { //读DHT11正确 byHumidityValue = dataBuf[0]; //湿度整数部分 dis1[3] = (char)(0X30+byHumidityValue/10); dis1[4] = (char)(0X30+byHumidityValue%10); dis1[5] = 0x25; //% byTemperatureValue = dataBuf[2]; //温度整数部分 dis1[12] = (char)(0X30+byTemperatureValue/10); dis1[13] = (char)(0X30+byTemperatureValue%10); } }