51单片机——DHT11模块

51单片机——DHT11模块

1.检测模块是否存在

#include "reg52.h"
#include "intrins.h"

sbit ledOne = P3^7;
sbit dht = P3^3;//模块的data插在p3.3

void Delay30ms()		//@11.0592MHz
{
	unsigned char i, j;

	i = 54;
	j = 199;
	do
	{
		while (--j);
	} while (--i);
}

void Delay60us()		//@11.0592MHz
{
	unsigned char i;

	i = 25;
	while (--i);
}

void Delay1000ms()		//@11.0592MHz
{
	unsigned char i, j, k;

	_nop_();
	i = 8;
	j = 1;
	k = 243;
	do
	{
		do
		{
			while (--k);
		} while (--j);
	} while (--i);
}

void check_DHT()
{
	//a :  dht = 1 
	dht = 1;
	//b ：dht = 0
	dht = 0;
	//延时30ms
	Delay30ms();
	//c： dht = 1
	dht = 1;
	//在60us后读d点，如果d点是低电平（被模块拉低），说明模块存在！
	Delay60us();
	if(dht == 0){
			ledOne = 0;//亮灯，说明模块存在
	}
}

void main()
{
	ledOne = 1;
	Delay1000ms();
	Delay1000ms();
	
	check_DHT();
	while(1);
}

2.读取温湿度数据

#include "reg52.h"
#include "intrins.h"

sbit ledOne = P3^7;
sbit dht = P3^3;//模块的data插在p3.3

char datas[5];

void Delay30ms()		//@11.0592MHz
{
	unsigned char i, j;

	i = 54;
	j = 199;
	do
	{
		while (--j);
	} while (--i);
}

void Delay60us()		//@11.0592MHz
{
	unsigned char i;

	i = 25;
	while (--i);
}

void Delay1000ms()		//@11.0592MHz
{
	unsigned char i, j, k;

	_nop_();
	i = 8;
	j = 1;
	k = 243;
	do
	{
		do
		{
			while (--k);
		} while (--j);
	} while (--i);
}

void DHT11_Start()
{
	dht = 1;
	dht = 0;
	//延时30ms
	Delay30ms();
	dht = 1;
	//卡d点；while(dht1); 卡e点 while(!dht) 卡f点：while(dht)
	while(dht);
	while(!dht);
	while(dht);
}

void Read_Data_From_DHT()
{
	int i;//轮
	int j;//每一轮读多少次
	char tmp;
	char flag;
	
	DHT11_Start();
	for(i= 0;i < 5;i++){
		//卡g点：while(!dht)       有效数据都是高电平，持续时间不一样，50us读，低电平0 高电平
		for(j=0;j<8;j++){
			while(!dht);//等待卡g点
			Delay60us();
			if(dht == 1){
				flag = 1;
				while(dht);
			}else{
				flag = 0;
			} 
			tmp = tmp << 1;
			tmp |= flag;
		}
		datas[i] = tmp;
	}

}

void main()
{
	ledOne = 1;
	Delay1000ms();
	Delay1000ms();
	while(1){
		Delay1000ms();
		Read_Data_From_DHT();	
	}
}

3.读取温湿度数据并通过串口上传

#include "reg52.h"
#include "intrins.h"

sbit ledOne = P3^7;
sbit dht = P3^3;//模块的data插在p3.3

char datas[5];


sfr AUXR = 0x8E;

void UartInit(void)		//[email protected]
{
	AUXR = 0x01;
	SCON = 0x40; //配置串口工作方式1，REN不使能接收
	TMOD &= 0xF0;
	TMOD |= 0x20;//定时器1工作方式位8位自动重装
	
	TH1 = 0xFD;
	TL1 = 0xFD;//9600波特率的初值
	TR1 = 1;//启动定时器
}
void sendByte(char data_msg)
{
	SBUF = data_msg;
	while(!TI);
	TI = 0;
}

void sendString(char* str)
{
	while( *str != '\0'){
		sendByte(*str);
		str++;
	}
}

void Delay30ms()		//@11.0592MHz
{
	unsigned char i, j;

	i = 54;
	j = 199;
	do
	{
		while (--j);
	} while (--i);
}

void Delay60us()		//@11.0592MHz
{
	unsigned char i;

	i = 25;
	while (--i);
}

void Delay1000ms()		//@11.0592MHz
{
	unsigned char i, j, k;

	_nop_();
	i = 8;
	j = 1;
	k = 243;
	do
	{
		do
		{
			while (--k);
		} while (--j);
	} while (--i);
}

void DHT11_Start()
{
	dht = 1;
	dht = 0;
	//延时30ms
	Delay30ms();
	dht = 1;
	//卡d点；while(dht1); 卡e点 while(!dht) 卡f点：while(dht)
	while(dht);
	while(!dht);
	while(dht);
}
void Delay40us()		//@11.0592MHz
{
	unsigned char i;

	_nop_();
	i = 15;
	while (--i);
}

void Read_Data_From_DHT()
{
	int i;//轮
	int j;//每一轮读多少次
	char tmp;
	char flag;
	
	DHT11_Start();
	for(i= 0;i < 5;i++){
		//卡g点：while(!dht)       有效数据都是高电平，持续时间不一样，50us读，低电平0 高电平
		for(j=0;j<8;j++){
			while(!dht);//等待卡g点
			Delay40us();
			if(dht == 1){
				flag = 1;
				while(dht);
			}else{
				flag = 0;
			} 
			tmp = tmp << 1;
			tmp |= flag;
		}
		datas[i] = tmp;
	}

}

void main()
{
	ledOne = 1;
	UartInit();
	Delay1000ms();
	Delay1000ms();
	while(1){
		Delay1000ms();
		Read_Data_From_DHT();	
		sendString("H:");
		sendByte(datas[0]/10 + 0x30);//43 a 
		sendByte(datas[0]%10 + 0x30);
		sendByte('.');
		sendByte(datas[1]/10 + 0x30);//43 a 
		sendByte(datas[1]%10 + 0x30);	
		sendString("\r\n");	
		sendString("T:");
		sendByte(datas[2]/10 + 0x30);//43 a 
		sendByte(datas[2]%10 + 0x30);	
		sendByte('.');
		sendByte(datas[3]/10 + 0x30);//43 a 
		sendByte(datas[3]%10 + 0x30);			
		sendString("\r\n");		
	}
}

4.在LCD显示并通过蓝牙发送温湿度

#include "reg52.h"
#include "intrins.h"

sbit ledOne = P3^7;
sbit dht = P3^3;//模块的data插在p3.3
sbit fengshan = P1^6;
char datas[5];


sfr AUXR = 0x8E;
#define databuffer  P0 //定义8位数据线，Po端口组
sbit RS = P1^0;
sbit RW = P1^1;
sbit EN = P1^4;
char temp[8];
char huma[8];

void check_busy()
{
	char tmp = 0x80;
	databuffer = 0x80;
	
	while(tmp & 0x80){//1000 0000
		RS = 0;
		RW = 1;
		EN = 0;
		_nop_();
		EN = 1;
		_nop_();
		_nop_();
		tmp = databuffer;
		EN = 0;
		_nop_();
	}
}

void Write_Cmd_Func(char cmd)
{
	check_busy();
	RS = 0;
	RW = 0;
	
	EN = 0;
	_nop_();
	databuffer = cmd;
	_nop_();
	EN = 1;
	_nop_();
	_nop_();
	EN = 0;
	_nop_();	
}

void Write_Data_Func(char dataShow)
{
	check_busy();
	RS = 1;
	RW = 0;
	
	EN = 0;
	_nop_();
	databuffer = dataShow;
	_nop_();
	EN = 1;
	_nop_();
	_nop_();
	EN = 0;
	_nop_();	
}

void Delay15ms()		//@11.0592MHz
{
	unsigned char i, j;

	i = 27;
	j = 226;
	do
	{
		while (--j);
	} while (--i);
}
void Delay5ms()		//@11.0592MHz
{
	unsigned char i, j;

	i = 9;
	j = 244;
	do
	{
		while (--j);
	} while (--i);
}

void UartInit(void)		//[email protected]
{
	AUXR = 0x01;
	SCON = 0x40; //配置串口工作方式1，REN不使能接收
	TMOD &= 0xF0;
	TMOD |= 0x20;//定时器1工作方式位8位自动重装
	
	TH1 = 0xFD;
	TL1 = 0xFD;//9600波特率的初值
	TR1 = 1;//启动定时器
}
void sendByte(char data_msg)
{
	SBUF = data_msg;
	while(!TI);
	TI = 0;
}

void sendString(char* str)
{
	while( *str != '\0'){
		sendByte(*str);
		str++;
	}
}

void Delay30ms()		//@11.0592MHz
{
	unsigned char i, j;

	i = 54;
	j = 199;
	do
	{
		while (--j);
	} while (--i);
}

void Delay60us()		//@11.0592MHz
{
	unsigned char i;

	i = 25;
	while (--i);
}

void Delay1000ms()		//@11.0592MHz
{
	unsigned char i, j, k;

	_nop_();
	i = 8;
	j = 1;
	k = 243;
	do
	{
		do
		{
			while (--k);
		} while (--j);
	} while (--i);
}

void DHT11_Start()
{
	dht = 1;
	dht = 0;
	//延时30ms
	Delay30ms();
	dht = 1;
	//卡d点；while(dht1); 卡e点 while(!dht) 卡f点：while(dht)
	while(dht);
	while(!dht);
	while(dht);
}
void Delay40us()		//@11.0592MHz
{
	unsigned char i;

	_nop_();
	i = 15;
	while (--i);
}

void Read_Data_From_DHT()
{
	int i;//轮
	int j;//每一轮读多少次
	char tmp;
	char flag;
	
	DHT11_Start();
	for(i= 0;i < 5;i++){
		//卡g点：while(!dht)       有效数据都是高电平，持续时间不一样，50us读，低电平0 高电平
		for(j=0;j<8;j++){
			while(!dht);//等待卡g点
			Delay40us();
			if(dht == 1){
				flag = 1;
				while(dht);
			}else{
				flag = 0;
			} 
			tmp = tmp << 1;
			tmp |= flag;
		}
		datas[i] = tmp;
	}

}

void LCD1602_INIT()
{
	//（1）延时 15ms
	Delay15ms();
//（2）写指令 38H(不检测忙信号) 
	Write_Cmd_Func(0x38);
//（3）延时 5ms
	Delay5ms();
//（4）以后每次写指令，读/写数据操作均需要检测忙信号
//（5）写指令 38H：显示模式设置
	Write_Cmd_Func(0x38);
//（6）写指令 08H：显示关闭
	Write_Cmd_Func(0x08);
//（7）写指令 01H：显示清屏
	Write_Cmd_Func(0x01);
//（8）写指令 06H：显示光标移动设置
	Write_Cmd_Func(0x06);
//（9）写指令 0CH：显示开及光标设置}
	Write_Cmd_Func(0x0c);
}


void LCD1602_showLine(char row, char col, char *string)
{
	
	switch(row){

		case 1:
				Write_Cmd_Func(0x80+col);
				while(*string){
					Write_Data_Func(*string);
					string++;
				}
				break;
		
		case 2:
				Write_Cmd_Func(0x80+0x40+col);
				while(*string){
					Write_Data_Func(*string);
					string++;
				}
				break;
	
	}
}

void Build_Datas()
{
	huma[0] = 'H';
	huma[1] = datas[0]/10 + 0x30;
	huma[2] = datas[0]%10 + 0x30;
	huma[3] = '.';
	huma[4] = datas[1]/10 + 0x30;
	huma[5] = datas[1]%10 + 0x30;
	huma[6] = '%';
	huma[7] = '\0';
	
	temp[0] = 'T';
	temp[1] = datas[2]/10 + 0x30;
	temp[2] = datas[2]%10 + 0x30;
	temp[3] = '.';
	temp[4] = datas[3]/10 + 0x30;
	temp[5] = datas[3]%10 + 0x30;
	temp[6] = 'C';
	temp[7] = '\0';
	
}

void main()
{
	
	Delay1000ms();
	UartInit();
	LCD1602_INIT();
	Delay1000ms();
	Delay1000ms();
	ledOne = 0;
	while(1){
		Delay1000ms();
		Read_Data_From_DHT();	
		if(datas[2] > 24){
			fengshan = 0;
		}
		Build_Datas();
		sendString(huma);
		sendString("\r\n");
		sendString(temp);
		sendString("\r\n");
		LCD1602_showLine(1,2,huma);
		LCD1602_showLine(2,2,temp);
	}
}