stm32f103+dht11+TFT1.44室内环境检测系统设计 -

#include "stm32f10x.h"
#include "beep.h"
#include "delay.h"
#include "dht11.h"
#include "key.h"
#include "lcd.h"
#include "led.h"
#include "usart.h"
#include "picture.h"
#include "stdio.h"
int main(void)
{
u8 T;
u8 H;
u8 t=0,i;
char TTT[20],HHH[20];
USART1_init();
BEEP_Init();
DHT11_Init();
LCD_Init();
LCD_BLK = 0;
delay_ms(6000);
LCD_Clear(YELLOW);
LCD_DrawFont_GBK16(10,40,BLACK,YELLOW, "系统正在启动中");
delay_ms(100);
LCD_DrawFont_GBK16(10,60,BLACK,YELLOW, "正在进入...");
for(i=3;i>0;i--)
{
LCD_DrawFont_Num32(50,80,RED,YELLOW,i);
delay_ms(1000);
}
LCD_Clear(GREEN);
LCD_DrawFont_GBK16(25,0,BLUE,GREEN, "运行中...");
LCD_DrawFont_GBK16(5,20,BLACK,GREEN, "温度:");
LCD_DrawFont_GBK16(5,40,BLACK,GREEN, "湿度:");
LCD_DrawFont_GBK16(5,60,BLACK,GREEN, "光照:");
LCD_DrawFont_GBK16(61,20,BLACK,GREEN, "度");
LCD_DrawFont_GBK16(61,40,BLACK,GREEN, "%RH");
LCD_DrawFont_GBK16(61,60,BLACK,GREEN, "CD");
while(1)
{
if(t%10==0)
{
DHT11_Read_Data(&T,&H); //读取温湿度值
sprintf(TTT,"%d",T); //将温度值转换为字符格式
sprintf(HHH,"%d",H); //将湿度值转换为字符格式
printf("温度: %d 度\r\n ",T);
printf("湿度: %d RH\r\n ",H);
}
if(T>25||H>94) //报警阈值
{
if(T>25)
{
LCD_DrawFont_GBK16(45,20,RED,GREEN,TTT);
}
if(H>94)
{
LCD_DrawFont_GBK16(45,40,RED,GREEN,HHH);
}
GPIO_SetBits(BEEP_PORT,BEEP_PIN);
delay_ms(10);
GPIO_ResetBits(BEEP_PORT,BEEP_PIN);
}
else
{
LCD_DrawFont_GBK16(45,20,BLACK,GREEN,TTT);
LCD_DrawFont_GBK16(45,40,BLACK,GREEN,HHH);
}
delay_ms(100);
t++;
}
}

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#include "dht11.h"
#include "delay.h"
void DHT11_Rst(void)
{
DHT11_IO_OUT(); //SET OUTPUT
DHT11_DQ_OUT=0; //拉低DQ
delay_ms(20); //拉低至少18ms
DHT11_DQ_OUT=1; //DQ=1
delay_us(30); //主机拉高20~40us
}
//等待DHT11的回应
//返回1:未检测到DHT11的存在
//返回0:存在
u8 DHT11_Check(void)
{
u8 retry=0;
DHT11_IO_IN();//SET INPUT
while (DHT11_DQ_IN&&retry<100)//DHT11会拉低40~80us
{
retry++;
delay_us(1);
};
if(retry>=100)return 1;
else retry=0;
while (!DHT11_DQ_IN&&retry<100)//DHT11拉低后会再次拉高40~80us
{
retry++;
delay_us(1);
};
if(retry>=100)return 1;
return 0;
}
//从DHT11读取一个位
//返回值：1/0
u8 DHT11_Read_Bit(void)
{
u8 retry=0;
while(DHT11_DQ_IN&&retry<100)//等待变为低电平
{
retry++;
delay_us(1);
}
retry=0;
while(!DHT11_DQ_IN&&retry<100)//等待变高电平
{
retry++;
delay_us(1);
}
delay_us(40);//等待40us
if(DHT11_DQ_IN)return 1;
else return 0;
}
//从DHT11读取一个字节
//返回值：读到的数据
u8 DHT11_Read_Byte(void)
{
u8 i,dat;
dat=0;
for (i=0;i<8;i++)
{
dat<<=1;
dat|=DHT11_Read_Bit();
}
return dat;
}
//从DHT11读取一次数据
//temp:温度值(范围:0~50°)
//humi:湿度值(范围:20%~90%)
//返回值：0,正常;1,读取失败
u8 DHT11_Read_Data(u8 *temp,u8 *humi)
{
u8 buf[5];
u8 i;
DHT11_Rst();
if(DHT11_Check()==0)
{
for(i=0;i<5;i++)//读取40位数据
{
buf[i]=DHT11_Read_Byte();
}
if((buf[0]+buf[1]+buf[2]+buf[3])==buf[4])
{
*humi=buf[0];
*temp=buf[2];
}
}else return 1;
return 0;
}
//初始化DHT11的IO口 DQ 同时检测DHT11的存在
//返回1:不存在
//返回0:存在
u8 DHT11_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //使能PA端口时钟
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; //PA11端口配置
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure); //初始化IO口
GPIO_SetBits(GPIOA,GPIO_Pin_11); //PA11 输出高
DHT11_Rst(); //复位DHT11
return DHT11_Check();//等待DHT11的回应
}

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#ifndef __DHT11_H
#define __DHT11_H
#include "sys.h"
#define DHT11_IO_IN() {GPIOA->CRH&=0XFFFF0FFF;GPIOA->CRH|=8<<12;}
#define DHT11_IO_OUT() {GPIOA->CRH&=0XFFFF0FFF;GPIOA->CRH|=3<<12;}
////IO操作函数
#define DHT11_DQ_OUT PAout(11) //数据端口 PA11
#define DHT11_DQ_IN PAin(11) //数据端口 PA11
u8 DHT11_Init(void);//初始化DHT11
u8 DHT11_Read_Data(u8 *temp,u8 *humi);//读取温湿度
u8 DHT11_Read_Byte(void);//读出一个字节
u8 DHT11_Read_Bit(void);//读出一个位
u8 DHT11_Check(void);//检测是否存在DHT11
void DHT11_Rst(void);//复位DHT11
#endif

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