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基于51單片機(jī)的二氧化碳、溫濕度檢測(cè)系統(tǒng)設(shè)計(jì)。采用LCD1602顯示，CO2傳感器使用MH-Z19B，溫濕度傳感器使用DHT11，此文件含有代碼、原理圖、PCB文件。

制作出來(lái)的實(shí)物圖如下：

Altium Designer畫(huà)的原理圖和PCB圖如下：(51hei附件中可下載工程文件)

單片機(jī)源程序如下:

/********************************** (C) COPYRIGHT *******************************
* File Name : main.C
* Author :
* License : MIT
* Version : V1.0
* Date : 2019/04/12
* Description : 51溫濕度二氧化碳檢測(cè)
*******************************************************************************/
#include <reg52.h>
#include "1602.h"
#include "dht.h"
#include "2402.h"
#define uchar unsigned char
#define uint unsigned int
#define ulong unsigned long
//定義三個(gè)LED燈
sbit Led_qushi = P1^0; //去濕燈
sbit Led_jiangwen = P1^1; //降溫?zé)?br />
sbit led_CO2 = P1^2; //二氧化碳控制燈
//定義蜂鳴器
sbit fmq = P2^3; //蜂鳴器
//定義設(shè)置鍵、調(diào)整鍵
sbit Key_TH1 = P3^0;//溫度上限值調(diào)整按鍵
sbit Key_TH2 = P3^1;
sbit Key_HH1 = P3^2;//濕度上限值調(diào)整按鍵
sbit Key_HH2 = P3^3;
sbit shezhi = P2^7;//設(shè)置鍵
sbit Key_CH1 = P2^6;//二氧化碳上限值調(diào)整按鍵
sbit Key_CH2 = P2^5;
//二氧化碳發(fā)送指令
uchar code tab[9]={0xff,0x01,0x86,0x00,0x00,0x00,0x00,0x00,0x79};
uchar date[]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
//定義標(biāo)識(shí)
volatile bit FlagStartRH = 0; //開(kāi)始溫濕度轉(zhuǎn)換標(biāo)志
volatile bit FlagKeyPress = 0; //有鍵按下
volatile bit fmqt = 0;
volatile bit fmqh = 0;
volatile bit fmqc = 0;
//定義溫濕度傳感器用外部變量
extern U8 U8FLAG,k;
extern U8 U8count,U8temp;
extern U8 U8T_data_H,U8T_data_L,U8RH_data_H,U8RH_data_L,U8checkdata;
extern U8 U8T_data_H_temp,U8T_data_L_temp,U8RH_data_H_temp,U8RH_data_L_temp,U8checkdata_temp;
extern U8 U8comdata;
extern U8 count, count_r;
U16 temp;
S16 temperature, humidity;
S16 idata TH, HH, ch; //溫度上限和濕度上限//二氧化碳上限值
char * pSave;
U8 keyvalue, keyTH1, keyTH2, keyHH1, keyHH2, keyCH1, keyCH2;
unsigned char moshi=0;
//定義變量
U16 RHCounter;
/************************************
延時(shí)子程序
延時(shí)時(shí)間(xms*1)ms
*************************************/
void delayms(uint xms)
{
uint x,y;
for(x=xms;x>0;x--)
for(y=110;y>0;y--);
}
/*******************************************************************************
* 功能 : 串口發(fā)送
* 注意事項(xiàng) :
*******************************************************************************/
void send(uchar dat) //發(fā)送一字節(jié)
{
SBUF=dat;
while(!TI);
TI=0;
}
/*******************************************************************************
* 功能 : 數(shù)據(jù)初始化程序
* 注意事項(xiàng) :
*******************************************************************************/
void Data_Init()
{
RHCounter = 0;
Led_qushi = 1;
Led_jiangwen = 1;
led_CO2 = 1;
TH = 40; //溫度初始上限值
HH = 85; //濕度初始上限限制
ch = 25; //二氧化碳初始上限值
keyvalue = 0;
keyTH1 = 1;
keyTH2 = 1;
keyHH1 = 1;
keyHH2 = 1;
keyCH1 = 1;
keyCH2 = 1;
}
//定時(shí)器0初始化
void Timer0_Init()
{
ET0 = 1; //允許定時(shí)器0中斷
TMOD = 1; //定時(shí)器工作方式選擇
TL0 = 0x06;
TH0 = 0xf8; //定時(shí)器賦予初值
TR0 = 1; //啟動(dòng)定時(shí)器
}
//存入設(shè)定值、
void Save_Setting()
{
pSave = (char *)&TH; //地址低位對(duì)應(yīng)低8位，高位對(duì)應(yīng)高8位
wrteeprom(0, *pSave); //存溫度上限值TH低8位
DELAY(300);
pSave ++;
wrteeprom(1, *pSave); //存溫度上限值TH高8位
DELAY(300);
pSave = (char *)&HH;
wrteeprom(2, *pSave); //存濕度上限值RH低8位
DELAY(300);
pSave ++;
wrteeprom(3, *pSave); //存濕度上限值RH高8位
DELAY(300);
pSave = (char *)&ch;
wrteeprom(4, *pSave); //存CO2上限值RH低8位
DELAY(300);
pSave ++;
wrteeprom(5, *pSave); //存CO2上限值RH高8位
DELAY(300);
}
//載入設(shè)定值、
void Load_Setting()
{
pSave = (char *)&TH;
*pSave++ = rdeeprom(0);
*pSave = rdeeprom(1);
pSave = (char *)&HH;
*pSave++ = rdeeprom(2);
*pSave = rdeeprom(3);
pSave = (char *)&ch;
*pSave++ = rdeeprom(4);
*pSave = rdeeprom(5);
if ((TH>99)||(TH<0)) TH = 40;
if ((HH>99)||(HH<0)) HH = 85;
if ((ch>50)||(ch<0)) ch = 25;
}
//按鍵掃描程序
void Key_set_scan()
{
if(shezhi==0)
{
delayms(10);
if(shezhi==0)
{
while(!shezhi);
L1602_init(); //初始化液晶
moshi++;
if(moshi >= 2)moshi = 0;
if(moshi == 0)
{
L1602_string(1,1,"Te: C ");
L1602_string(1,9,"Hu: % ");
L1602_string(2,1,"PPM: ");
}
else if(moshi == 1)
{
L1602_string(1,1,"TH:");
L1602_string(1,9,"HH:");
L1602_string(2,1,"CH:");
L1602_string(2,8,"0");
L1602_string(2,9,"0");
}
}
}
}
//按鍵加減設(shè)定值
void KeyProcess(uint num)
{
switch (num)
{
case 1:
if (TH<99) TH++;
L1602_char(1, 5, TH/10+48);
L1602_char(1, 6, TH%10+48);
break;
case 2:
if (TH>1) TH--;
L1602_char(1, 5, TH/10+48);
L1602_char(1, 6, TH%10+48);
break;
case 3:
if (HH<99) HH++;
L1602_char(1, 13, HH/10+48);
L1602_char(1, 14, HH%10+48);
break;
case 4:
if (HH>1) HH--;
L1602_char(1, 13, HH/10+48);
L1602_char(1, 14, HH%10+48);
break;
case 5:
if (ch<50) ch++;
L1602_char(2, 6, ch/10+48);
L1602_char(2, 7, ch%10+48);
break;
case 6:
if (ch>1) ch--;
L1602_char(2, 6, ch/10+48);
L1602_char(2, 7, ch%10+48);
break;
default:
break;
}
Save_Setting();
}
/*******************************************************************************
* 函數(shù) 名 : main
* 函數(shù)功能 : 主函數(shù)
* 輸入 : 無(wú)
* 輸出 : 無(wú)
*******************************************************************************/
void main()
{
U16 testnum;
uint tmp;
uchar m;
EA = 0;
Timer0_Init(); //定時(shí)器0初始化
Data_Init();
EA = 1;
TMOD=0x20; // T1定時(shí)方式2
SCON=0x40;//串行工作方式1
PCON=0x00; //不加倍
TH1=TL1=0xfd; //定時(shí)器1賦初值保證波特率9600
TR1=1; //開(kāi)定時(shí)器1
REN=1; //允許串口接收
delayms(10);
ES=1; //打開(kāi)串口中斷
EA=1; //開(kāi)總中斷
L1602_init();
Load_Setting();
while(1)
{
for(m=0;m<9;m++) //向co2傳感器發(fā)送數(shù)據(jù)
{
send(tab[m]);
}
delayms(100); //延時(shí)0.1s 刷新測(cè)得數(shù)據(jù)
tmp=date[2]*256+date[3]; //計(jì)算出co2濃度值
//溫濕度轉(zhuǎn)換標(biāo)志檢查
if (FlagStartRH == 1)
{
TR0 = 0;
testnum = RH();
FlagStartRH = 0;
TR0 = 1;
//讀出溫濕度，只取整數(shù)部分
humidity = U8RH_data_H;
temperature = U8T_data_H;
}
//溫濕度控制
if (temperature > TH)
{
Led_jiangwen = 0;
fmqt=1;
}
else
{
Led_jiangwen = 1;
fmqt=0;
} //降溫
if (humidity > HH)
{
Led_qushi = 0;
fmqh=1;
}
else
{
Led_qushi = 1;
fmqh=0;
} //去濕
if (tmp/100 > ch)
{
led_CO2 = 0;
fmqc=1;
}
else
{
led_CO2 = 1;
fmqc=0;
} //CO2
if((fmqt==1)||(fmqh==1)||(fmqc==1))
fmq=0;
else
fmq=1;
Key_set_scan();//按鍵掃描
if(moshi == 0) //設(shè)置模式切換
{
delayms(50);
L1602_string(1,1,"Te: C ");
L1602_string(1,9,"Hu: % ");
L1602_string(2,1,"PPM: ");
if(tmp>9999)
tmp=0;
L1602_int(2,5,tmp);
if((tmp/1000)>0)
L1602_int(2,5,tmp/1000);
//顯示溫濕度
L1602_int(1,3, temperature);
L1602_int(1,11,humidity);
}
else if(moshi == 1) //設(shè)置上限模式
{
L1602_char(1, 5, TH/10+48);
L1602_char(1, 6, TH%10+48);
L1602_char(1, 13, HH/10+48);
L1602_char(1, 14, HH%10+48);
L1602_char(2, 6, ch/10+48);
L1602_char(2, 7, ch%10+48);
}
//U8 keyvalue, keyTH1, keyTH2, keyHH1, keyHH2, keyCH1, keyCH2;
//鍵盤(pán)查詢(xún)，在彈起時(shí)響應(yīng)
if ((Key_TH1)&&(keyTH1==0)) {FlagKeyPress = 1; keyvalue = 1;}
else if ((Key_TH2)&&(keyTH2==0)) {FlagKeyPress = 1; keyvalue = 2;}
else if ((Key_HH1)&&(keyHH1==0)) {FlagKeyPress = 1; keyvalue = 3;}
else if ((Key_HH2)&&(keyHH2==0)) {FlagKeyPress = 1; keyvalue = 4;}
else if ((Key_CH1)&&(keyCH1==0)) {FlagKeyPress = 1; keyvalue = 5;}
else if ((Key_CH2)&&(keyCH2==0)) {FlagKeyPress = 1; keyvalue = 6;}
if (FlagKeyPress == 1)
{
KeyProcess(keyvalue);
FlagKeyPress = 0;
}
if (!Key_TH1) keyTH1 = 0;
else keyTH1 = 1;
if (!Key_TH2) keyTH2 = 0;
else keyTH2 = 1;
if (!Key_HH1) keyHH1 = 0;
else keyHH1 = 1;
if (!Key_HH2) keyHH2 = 0;
else keyHH2 = 1;
if (!Key_CH1) keyCH1 = 0;
else keyCH1 = 1;
if (!Key_CH2) keyCH2 = 0;
else keyCH2 = 1;
}
}
//定時(shí)器0中斷
void Timer0_ISR (void) interrupt 1
{
TL0 = 0x06;
TH0 = 0xf8; //定時(shí)器賦予初值
//每2秒鐘啟動(dòng)一次溫濕度轉(zhuǎn)換
RHCounter ++;
if (RHCounter >= 1000)
{
FlagStartRH = 1;
RHCounter = 0;
}
}
//串口中斷服務(wù)函數(shù)
void serial()interrupt 4
{
static uchar j;
ES=0; //禁止中斷
if(!RI);
RI=0; //清楚接收完畢標(biāo)志
date[j]=SBUF;
if(date[0]==0xff) //判斷接收到的第一位為傳感器所發(fā)數(shù)據(jù)
j++;
else
j=0;
if(j==9) //接收傳感器所發(fā)數(shù)據(jù)9字節(jié)
j=0;
ES=1; //允許串口中斷
}

復(fù)制代碼

所有資料51hei提供下載:

51單片機(jī)二氧化碳_溫濕度檢測(cè)C程序+原理圖+PCB.zip (1.85 MB, 下載次數(shù): 261)

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