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); // 10msKey_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DS18B20void DS18B20_Rst(void) {DS18B20_IO_OUT(); //设置为输出DS18B20_DQ_OUT(0); //拉低DQdelay_us(740);//拉低750usDS18B20_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：1/0uint8_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 romDS18B20_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; //PA0GPIO_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 romDS18B20_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_2N0void 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);elsedata0(0);if (num&0x02)data1(1);elsedata1(0);if (num&0x04)data2(1);elsedata2(0);if (num&0x08)data3(1);elsedata3(0);if (num&0x10)data4(1);elsedata4(0);if (num&0x20)data5(1);elsedata5(0);if (num&0x40)data6(1);elsedata6(0);if (num&0x80)data7(1);elsedata7(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++;}}
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