基于STM32大棚DHT11温湿度监测的Proteus仿真

本设计仅供学习参考
基于STM32大棚DHT11温湿度监测的Proteus仿真 (代码+仿真+原理图+PCB)
原理图：Altium Designer
仿真图protues 8.9
程序编译器：keil 5
编程语言：C语言
编号C0032

资料下载链接

主要功能：
1.液晶实时显示DHT11温度和湿度值；
2.具有温湿度超上限阈值报警功能；
3.温湿度上限值阈值可通过按键调节。

仿真图（提供源文件）：

电路图：

PCB（未做实物验证，仅供参考）：

程序（提供源文件源码）：
main函数

int main(void)
{
  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();
  /* Configure the system clock */
  SystemClock_Config();
	delay_init(10);               		//初始化延时函数
  TIM3_Init(2400-1, 72-1); // 10ms
	
	Key_Init();
	Beep_Init();
	LCD_Init();
	DHT11_Init();
	
  while(1)
  {
		if(DHT11_Read_TempAndHumidity(&DHT11_Data) == SUCCESS)
		{
			temp_table[3] = DHT11_Data.temp_int / 10 + 0x30;
			temp_table[4] = DHT11_Data.temp_int % 10 + 0x30;
			temp_table[5] = 'c';
			
			humi_table[3] = DHT11_Data.humi_int / 10 + 0x30;
			humi_table[4] = DHT11_Data.humi_int % 10 + 0x30;

			
			tMax_table[3] = temp_max / 10 + 0x30;
			tMax_table[4] = temp_max % 10 + 0x30;
			tMax_table[5] = 'c';

			hMax_table[3] = humi_max / 10 + 0x30;
			hMax_table[4] = humi_max % 10 + 0x30;

			
			LCD_write_string(0,  0, (char*)temp_table);
			LCD_write_string(8,  0, (char*)humi_table);

			LCD_write_string(0,  1, (char*)tMax_table);
			LCD_write_string(8,  1, (char*)hMax_table);
		}
		if(DHT11_Data.temp_int >= temp_max || DHT11_Data.humi_int >= humi_max)
		{
			LED2_ON();
			BEEP_ON();
		}		
		else
		{
			LED2_OF();
			BEEP_OF();
		}		
		delay_ms(500);

  }
}

获取温度函数

#include "ds18b20.h"
#include "delay.h"


//复位DS18B20
void DS18B20_Rst(void)	   
{                 
	DS18B20_IO_OUT();   //设置为输出
	DS18B20_DQ_OUT(0);  	//拉低DQ
	delay_us(740);      //拉低750us
	DS18B20_DQ_OUT(1);  	//DQ=1 
	delay_us(15);       //15US
}

//等待DS18B20的回应
//返回1:未检测到DS18B20的存在
//返回0:存在
uint8_t DS18B20_Check(void) 	   
{   
	uint8_t retry = 0;
	
	DS18B20_IO_IN();    //设置为输入 
	
  while (DS18B20_DQ_IN&&retry < 200)
	{
		retry ++;
		delay_us(2);
	};	 
	if(retry >= 200)
		return 1;
	else 
		retry = 0;
	
  while (!DS18B20_DQ_IN&&retry < 240)
	{
		retry++;
		delay_us(2);
	};
	if(retry>=240)
		return 1;	
	
	return 0;
}

//从DS18B20读取一个位
//返回值：1/0
uint8_t DS18B20_Read_Bit(void) 
{
	uint8_t data = 0;
	
	DS18B20_IO_OUT();   //设置为输出
	DS18B20_DQ_OUT(0); 
	delay_us(2);
	
	DS18B20_DQ_OUT(1); 
	DS18B20_IO_IN();    //设置为输入
	delay_us(13);
	
	if(DS18B20_DQ_IN)
		data=1;
	else 
		data=0;
	
	delay_us(50);
	
	return data;
}

//从DS18B20读取一个字节
//返回值：读到的数据
uint8_t DS18B20_Read_Byte(void)   
{        
	uint8_t i, j = 0, dat = 0;
		
	for (i=1;i<=8;i++) 
	{
		j=DS18B20_Read_Bit();
		dat=(j<<7)|(dat>>1);
  }						    
	return dat;
}

//写一个字节到DS18B20
//dat：要写入的字节
void DS18B20_Write_Byte(uint8_t dat)     
{             
	uint8_t j;
	uint8_t testb = 0;
 
	DS18B20_IO_OUT();     //设置为输出
 
	for (j=1;j<=8;j++) 
	{
		testb = dat&0x01;
		dat = dat>>1;
		if(testb)       // 写1
		{
			DS18B20_DQ_OUT(0);
			delay_us(2);                            
			DS18B20_DQ_OUT(1);
			delay_us(49);             
		}
		else            //写0
		{
			DS18B20_DQ_OUT(0);
			delay_us(49);             
			DS18B20_DQ_OUT(1);
			delay_us(2);                          
		}
	}
}
 
//开始温度转换
void DS18B20_Start(void)
{   						               
	DS18B20_Rst();	   
	DS18B20_Check();	 
	DS18B20_Write_Byte(0xcc);// skip rom
	DS18B20_Write_Byte(0x44);// convert
}

//初始化DS18B20的IO口 DQ 同时检测DS的存在
//返回1:不存在
//返回0:存在    	 
uint8_t DS18B20_Init(void)
{
	GPIO_InitTypeDef GPIO_Initure;
	DS18B20_DATA_CLK();			//开启GPIOA时钟

	GPIO_Initure.Pin=DS18B20_DATA_PIN;           	//PA0
	GPIO_Initure.Mode=GPIO_MODE_OUTPUT_PP;  //推挽输出
	GPIO_Initure.Pull=GPIO_PULLUP;          //上拉
	GPIO_Initure.Speed=GPIO_SPEED_FREQ_LOW;//高速
	HAL_GPIO_Init(DS18B20_DATA_PORT,&GPIO_Initure);     //初始化
 
	DS18B20_Rst();
	return DS18B20_Check();
}

//从ds18b20得到温度值
//精度：0.1C
//返回值：温度值 （-550~1250） 
short DS18B20_Get_Temp(void)
{
	uint8_t temp = 0;
	uint8_t TL = 0,TH = 0;
	short tem = 0;

	DS18B20_Start ();           //开始转换
	DS18B20_Rst();
	DS18B20_Check();	 
	DS18B20_Write_Byte(0xcc);   // skip rom
	DS18B20_Write_Byte(0xbe);   // convert	    
	TL=DS18B20_Read_Byte();     // LSB   
	TH=DS18B20_Read_Byte();     // MSB  
	
	if(TH > 7)
	{
			TH = ~TH;
			TL = ~TL; 
			temp = 0;//温度为负  
	}
	else 
		temp = 1;//温度为正	
	
	tem = TH; //获得高八位
	tem <<= 8;    
	tem += TL;//获得底八位
	tem=(double)tem*0.625;//转换  
	
	if(temp)
		return tem; //返回温度值
	else 
		return -tem;    
}
 

LCD1602显示

#include "lcd1602.h"
                             
#define DELAY_2N     0

void lcd_delay_us(unsigned int t)
{
	unsigned int i, j;
	
	for(i = 10; i > 0; i--)
		for(j = t; j > 0; j--);
}

void lcd_delay_ms(unsigned int t)
{	
	unsigned int i;
	
	for(i = t; i > 0; i--)
		lcd_delay_us(10);
}

//==================================================
void LCD_Init(void)
{
		GPIO_InitTypeDef GPIO_Initure;   

		LCD_CTRL_CLK();
		LCD_DATA_CLK();
		
		GPIO_Initure.Pin = LCD_RS_PIN|LCD_RW_PIN|LCD_EN_PIN; 				
		GPIO_Initure.Mode = GPIO_MODE_OUTPUT_PP;  	
		GPIO_Initure.Pull = GPIO_PULLUP;          
		GPIO_Initure.Speed = GPIO_SPEED_FREQ_MEDIUM;   
		HAL_GPIO_Init(LCD_CTRL_PORT, &GPIO_Initure);

		GPIO_Initure.Pin = LCD_DATA0_PIN|LCD_DATA1_PIN|LCD_DATA2_PIN|LCD_DATA3_PIN|LCD_DATA4_PIN|LCD_DATA5_PIN|LCD_DATA6_PIN|LCD_DATA7_PIN; 				
		HAL_GPIO_Init(LCD_DATA_PORT, &GPIO_Initure);
	

    LCD_RW(0);			//读写位直接低电平，只写不读

    /*********************液晶初始化**************************/        
    lcd_delay_us(340); 
		LCD_RS(0);
   
    LCD_write_cmd(0x38);          // 8bit显示模式,2行,5x7字体
    lcd_delay_ms(4);  
    LCD_write_cmd(0x08);         // 显示关闭 
    lcd_delay_ms(4); 
    LCD_write_cmd(0x01);         // 显示清屏 
    lcd_delay_ms(4); 
    LCD_write_cmd(0x06);         // 显示光标移动设置 
    lcd_delay_ms(4);
    LCD_write_cmd(0x0c);         // 显示开，光标开，光标闪烁
    lcd_delay_ms(4);
		LCD_write_cmd(0x01);         //清屏
		lcd_delay_ms(4);
}
/*--------------------------------------------------
函数说明：写命令到液晶


---------------------------------------------------*/
void LCD_write_cmd(unsigned char cmd)
{
    LCD_RS(0);
    LCD_Write_byte(cmd);
    lcd_delay_us(340);
}
/*--------------------------------------------------
函数说明：写数据到液晶


---------------------------------------------------*/
void LCD_write_data(unsigned char w_data)
{
    LCD_RS(1);
    LCD_Write_byte(w_data);
    lcd_delay_us(340);
}
/*--------------------------------------------------
函数说明：写4bit到液晶
--------------------------------------------------*/
void LCD_Write_byte(unsigned char num)
{  
		if (num&0x01)
				data0(1);
		else
				data0(0);

		if (num&0x02)
				data1(1);
		else
				data1(0);

		if (num&0x04)
				data2(1);
		else
				data2(0);

		if (num&0x08)
				data3(1);
		else
				data3(0);

		if (num&0x10)
				data4(1);
		else
				data4(0);

		if (num&0x20)
				data5(1);
		else
				data5(0);

		if (num&0x40)
				data6(1);
		else
				data6(0);
		
		if (num&0x80)
				data7(1);
		else
				data7(0);
		
		lcd_delay_us(340);
    LCD_EN(1);
    lcd_delay_us(340);
    LCD_EN(0); 
    lcd_delay_us(340);
}

/*----------------------------------------------------
LCD_set_xy        : 设置LCD显示的起始位置
输入参数：x、y    : 显示字符串的位置，X:0-15，Y:0-1                
-----------------------------------------------------*/
void LCD_set_xy( unsigned char x, unsigned char y )
{
    unsigned char address = 0;
    if (y==0) 
    {
        address=0x80+x;
    }
    else 
    {
        address=0xc0+x;
    }
//		y ? (address=0xc0+x): (address=0x80+x) ;
    LCD_write_cmd(address);
}
/*---------------------------------------------------
LCD_write_string  : 英文字符串显示函数
输入参数：*s      ：英文字符串指针；
          X、Y    : 显示字符串的位置                
---------------------------------------------------*/
void LCD_write_string(unsigned char X,unsigned char Y, char *s)
{
    LCD_set_xy(X,Y);   
    while (*s != NULL) 
    {
        LCD_write_data(*s);
        s++;
    }
}

//=======================================================
void LCD_wstring(unsigned char X,unsigned char *s)
{
    LCD_write_cmd(X);   
    while (*s) 
    {
        LCD_write_data(*s);
        s++;
    }
}