基于51单片机的DHT11温湿度监测+液晶LCD1602显示程序源代码/***************DHT11温湿度监测+液晶LCD1602显示程序源代码******************单片机型号：STC15W4K56S4，内部晶振：22.1184M。
功能：DHT11温湿度监测+液晶LCD1602显示。
操作说明：通过温湿度传感器DHT11监测温湿度数值，并将温湿度数值显示在液晶LCD1602上。
**************************************************************************/#include "stc15.h" //包含头文件stc15.h#include <intrins.h> //包含头文件intrins.h#define Busy 0x80 //LCD忙sbit LCD_D0 = P0^0; //LCD_D0对应P0.0sbit LCD_D1 = P0^1; //LCD_D1对应P0.1sbit LCD_D2 = P0^2; //LCD_D2对应P0.2sbit LCD_D3 = P0^3; //LCD_D3对应P0.3sbit LCD_D4 = P0^4; //LCD_D4对应P0.4sbit LCD_D5 = P0^5; //LCD_D5对应P0.5sbit LCD_D6 = P0^6; //LCD_D6对应P0.6sbit LCD_D7 = P0^7; //LCD_D7对应P0.7sbit LCD_RS = P1^0; //LCD_RS对应P1.0sbit LCD_RW = P1^1; //LCD_RW对应P1.1sbit LCD_EN = P3^4; //LCD_EN对应P3.4sbit DHT11_PIN = P4^0; //DHT11管脚对应P4.0void delay(unsigned int t); //delay延时函数void delay_us(unsigned int t); //delay_us延时函数void delay_ms(unsigned int t); //delay_ms延时函数void Delay5Ms(void); //5Ms延时函数void GPIO_1602_Configuration(void); //LCD1602液晶IO口初始化void WriteDataLCD(unsigned char WDLCD); //LCD写数据函数void WriteCommandLCD(unsigned char WCLCD,BuysC); //LCD写命令函数unsigned char ReadDataLCD(void); //LCD读数据函数unsigned char ReadStatusLCD(void); //LCD读状态函数void LCDInit(void); //LCD初始化void DisplayOneChar(unsigned char X,unsigned char Y,unsigned char DData);//LCD显示一个字符void DisplayListChar(unsigned char X,unsigned char Y,unsigned char code *DData); //LCD显示一个字符串void DHT11_Init(void); //初始化DHT11void DHT11_Delay(unsigned int j); //延时函数，用于DHT11 void DHT11_Delay_10us(void); //延时函数，用于DHT11 void COM(void);void RH(unsigned char *temp,unsigned char *humi);void DHT11_Display(void);unsigned char code welcome[] = {"DHT 11"}; //LCD显示内容DHT 11 unsigned char code Dht11[] = {"T: H: "}; //LCD显示内容T: H: unsigned char code Space[] = {" "};//LCD显示内容空白unsigned char U8FLAG,k;unsigned char U8count,U8temp;unsigned char U8T_data_H_temp,U8T_data_L_temp;unsigned char U8RH_data_H_temp,U8RH_data_L_temp;unsigned char U8checkdata_temp;unsigned char U8comdata;unsigned char temperature;unsigned char humidity;unsigned char disbuff_T[4]={0,0,0,0};unsigned char disbuff_H[4]={0,0,0,0};void delay(unsigned int t) //delay延时函数{while(t--);}void delay_us(unsigned int t) //delay_us延时函数{unsigned char i;while(t--){i = 3;while(i--) delay(1);}}void delay_ms(unsigned int t) //delay_ms延时函数{while(t--){delay_us(t);}}void Delay5Ms(void) //5ms延时函数{unsigned int TempCyc = 3552;while(TempCyc--);}void GPIO_1602_Configuration(void) //LCD1602液晶IO口初始化{P0M1 = P3M1&0x00;P0M0 = P3M0&0x00;P1M1 = P3M1&0xfc;P1M0 = P3M0&0xfc;P3M1 = P4M1&0xef;P3M0 = P4M0&0xef;}unsigned char ReadStatusLCD(void) //测试LCD忙碌状态{LCD_D7 = 1; //LCD的D7置1LCD_RS = 0; //LCD管脚RS设置成低电平LCD_RW = 1; //LCD管脚RW设置成高电平LCD_EN = 0; //LCD管脚E设置成低电平LCD_EN = 0; //LCD管脚E设置成低电平LCD_EN = 1; //LCD管脚E设置成高电平while(LCD_D7); //检测忙信号return(Busy); //表示当前忙}void WriteCommandLCD(unsigned char WCLCD,BuysC) //BuysC为0时忽略忙检测{if(BuysC) ReadStatusLCD(); //根据需要检测忙LCD_EN = 0; //LCD管脚E设置成低电平_nop_(); //空操作，延时_nop_(); //空操作，延时_nop_(); //空操作，延时_nop_(); //空操作，延时_nop_(); //空操作，延时_nop_(); //空操作，延时_nop_(); //空操作，延时_nop_(); //空操作，延时LCD_RS = 0; //LCD管脚RS设置成低电平LCD_RW = 0; //LCD管脚RW设置成低电平_nop_(); //空操作，延时_nop_(); //空操作，延时P0 = WCLCD; //将数据送入P0口，即写入指令或地址 _nop_(); //空操作，延时_nop_(); //空操作，延时_nop_(); //空操作，延时_nop_(); //空操作，延时LCD_EN = 1; //E置高电平_nop_(); //空操作，延时_nop_(); //空操作，延时_nop_(); //空操作，延时_nop_(); //空操作，延时LCD_EN = 0;//当E由高电平跳变成低电平时，液晶模块开始执行命令}void WriteDataLCD(unsigned char WDLCD) //LCD写数据函数{ReadStatusLCD(); //读取LCD状态LCD_EN = 0; //LCD管脚E设置成低电平_nop_(); //空操作，延时_nop_(); //空操作，延时_nop_(); //空操作，延时_nop_(); //空操作，延时_nop_(); //空操作，延时_nop_(); //空操作，延时_nop_(); //空操作，延时_nop_(); //空操作，延时LCD_RS = 1; //LCD管脚RS设置成高电平LCD_RW = 0; //LCD管脚RW设置成低电平P0 = WDLCD; //将数据送入P0口_nop_(); //空操作，延时_nop_(); //空操作，延时_nop_(); //空操作，延时_nop_(); //空操作，延时LCD_EN = 1; //E置高电平_nop_(); //空操作，延时_nop_(); //空操作，延时_nop_(); //空操作，延时_nop_(); //空操作，延时LCD_EN = 0;//当E由高电平跳变成低电平时，液晶模块开始执行命令}void LCDInit(void) //LCD初始化{WriteCommandLCD(0x38,0); //三次显示模式设置，不检测忙信号Delay5Ms();WriteCommandLCD(0x38,0);Delay5Ms();WriteCommandLCD(0x38,0);Delay5Ms();WriteCommandLCD(0x38,0);WriteCommandLCD(0x08,1); //关闭显示WriteCommandLCD(0x01,1); //显示清屏WriteCommandLCD(0x06,1); //显示光标移动设置WriteCommandLCD(0x0C,1); //显示开及光标设置}void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData){Y &= 0x1;X &= 0xF; //限制X不能大于15，Y不能大于1if (Y) X |= 0x40; //当要显示第二行时地址码+0x40;X |= 0x80; //算出指令码WriteCommandLCD(X,0); //这里不检测忙信号，发送地址码WriteDataLCD(DData); //发送数据}void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData) {unsigned char ListLength;ListLength = 0;Y &= 0x1;X &= 0xF; //限制X不能大于15，Y不能大于1while (DData[ListLength]>=0x20) //若到达字串尾则退出{if (X <= 0xF) //X坐标应小于0xF{DisplayOneChar(X, Y, DData[ListLength]);//显示单个字符ListLength++;X++;}}}void DHT11_Init(void) //初始化DHT11 {P4M1 = P4M1&0xfe;P4M0 = P4M0&0xfe;}void DHT11_Delay(unsigned int j){unsigned char i;for(;j>0;j--){for(i=0;i<250;i++);}}void DHT11_Delay_10us(void){unsigned char i;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;i--;}void COM(void){unsigned char i;for(i=0;i<8;i++){U8FLAG=2;while((!DHT11_PIN)&&U8FLAG++);DHT11_Delay_10us();DHT11_Delay_10us();DHT11_Delay_10us();U8temp=0;if(DHT11_PIN)U8temp=1;U8FLAG=2;while((DHT11_PIN)&&U8FLAG++); //超时则跳出for循环if(U8FLAG==1)break;//判断数据位是0还是1,如果高电平高过预定0高电平值则数据位为 1U8comdata<<=1;U8comdata|=U8temp;}}void RH(unsigned char *temp,unsigned char *humi){DHT11_PIN = 0;DHT11_Delay(180);DHT11_PIN = 1; //总线由上拉电阻拉高主机延时20us DHT11_Delay_10us();DHT11_Delay_10us();DHT11_Delay_10us();DHT11_Delay_10us(); //主机设为输入判断从机响应信号DHT11_PIN = 1;//判断从机是否有低电平响应信号如不响应则跳出，响应则向下运行if(!DHT11_PIN){U8FLAG=2;//判断从机是否发出 80us 的低电平响应信号是否结束while((!DHT11_PIN)&&U8FLAG++);U8FLAG=2;//判断从机是否发出 80us 的高电平，如发出则进入数据接收状态while((DHT11_PIN)&&U8FLAG++); //数据接收状态COM();U8RH_data_H_temp=U8comdata;COM();U8RH_data_L_temp=U8comdata;COM();U8T_data_H_temp=U8comdata;COM();U8T_data_L_temp=U8comdata;COM();U8checkdata_temp=U8comdata;DHT11_PIN=1; //数据校验U8temp=(U8T_data_H_temp+U8T_data_L_temp+U8RH_data_H_temp+U8RH_data_L_temp); if(U8temp==U8checkdata_temp){*temp = U8T_data_H_temp;*humi = U8RH_data_H_temp;}}}void DHT11_Display(void){RH(&temperature,&humidity);disbuff_T[2]=temperature/100+0x30;disbuff_T[1]=temperature/10%10+0x30;disbuff_T[0]=temperature%10+0x30;disbuff_H[2]=humidity/100+0x30;disbuff_H[1]=humidity/10%10+0x30;disbuff_H[0]=humidity%10+0x30;DisplayOneChar(2,1,disbuff_T[2]);delay_ms(10); //延时DisplayOneChar(3,1,disbuff_T[1]);delay_ms(10); //延时DisplayOneChar(4,1,disbuff_T[0]);delay_ms(10); //延时DisplayOneChar(8,1,disbuff_H[2]);delay_ms(10); //延时DisplayOneChar(9,1,disbuff_H[1]);delay_ms(10); //延时DisplayOneChar(10,1,disbuff_H[0]);delay_ms(10); //延时}void main(void){GPIO_1602_Configuration(); //LCD1602液晶IO口初始化delay_ms(10); //延时LCDInit(); //LCD1602初始化delay_ms(10); //延时DHT11_Init(); //初始化DHT11DisplayListChar(5,0,welcome); //LCD1602显示Hello My Friends delay_ms(10); //延时while(1){DisplayListChar(0,1,Space); //LCD1602显示P: K1delay_ms(10); //延时DisplayListChar(0,1,Dht11); //LCD1602显示delay_ms(10); //延时DHT11_Display();delay_ms(200); //延时}}程序源代码是编译通过的DHT11温湿度监测模块接口电路图该程序的实际运行效果。
