温湿度小系统
分为四个模块:
1、51开发板
2、显示模块:lcd1602
3、温湿度模块:DHT11
4、通信模块:HC-08蓝牙
代码采用分文件编程
主函数:main.c
#include "reg52.h"
#include "intrins.h"
#include "delay.h"
#include "lcd1602.h"
#include "uart.h"
#include "dht11.h"
#include "config.h"
char temp[8];
char huma[8];
extern char datas[5];
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;
}else{
fengshan = 1;
}
Build_Datas();
sendString(huma);
sendString("\r\n");
sendString(temp);
sendString("\r\n");
LCD1602_showLine(1,2,huma);
LCD1602_showLine(2,2,temp);
}
}
串口的调用:uart.c
#include "reg52.h"
#include "config.h"
#include <string.h>
sfr AUXR = 0x8E;
sbit D6 = P3^6;
char buffer[12];
void UartInit(void) //[email protected]
{
AUXR = 0x01;
SCON = 0x50; //配置串口工作方式1,REN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
EA = 1;//开启总中断
ES = 1;//开启串口中断
}
void sendByte(char data_msg)
{
SBUF = data_msg;
while(!TI);
TI = 0;
}
void sendString(char* str)
{
while( *str != '\0'){
sendByte(*str);
str++;
}
}
void Uart_Handler() interrupt 4
{
char tmp;
char i;
if(RI)//中断处理函数中,对于接收中断的响应
{
RI = 0;//清除接收中断标志位
tmp = SBUF;
if(tmp == ':'){
i = 0;
}
buffer[i++] = tmp;
if(buffer[0] == ':' && buffer[1] =='o' && buffer[2] == 'p'){
fengshan = 0;
memset(buffer,'\0',12);
}
if(buffer[0] == ':' && buffer[1] == 'c' && buffer[2] == 'l'){
fengshan = 1;
D6 = 0;
Delay1000ms();
Delay1000ms();
memset(buffer,'\0',12);
}
}
if(TI);
}
温湿度传感器调用:dht11.c
#include "reg52.h"
#include "delay.h"
sbit dht = P3^3;//模块的data插在p3.3
char datas[5];
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
Delay40us();
if(dht == 1){
flag = 1;
while(dht);
}else{
flag = 0;
}
tmp = tmp << 1;
tmp |= flag;
}
datas[i] = tmp;
}
延迟函数(采用软件延时):delay.c
#include "intrins.h"
void Delay30ms() //@11.0592MHz
{
unsigned char i, j;
i = 54;
j = 199;
do
{
while (--j);
} while (--i);
}
void Delay40us() //@11.0592MHz
{
unsigned char i;
_nop_();
i = 15;
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 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 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);
}
**注意:**头文件的调用未给出;
kile中跨文件引用数组变量,需要将数组变量定义成extern 数组变量,含义为调用别的文件中的数组变量。