Intelligent air-conditioning control system based on 51 single-chip microcomputer
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1 Development environment
Simulation diagram: proteus8.9 or above
Program code: KEIL4/KEIL5
Schematic/PCB:AD
Design number: A0003
Explain the demonstration video
video
Video explanation of intelligent air conditioning control system based on 51 single chip microcomputer
2 Function Description Introduction
Air-conditioning temperature control system based on 51 single-chip microcomputer
Consists of STC89C51 microcontroller + LCD1602 liquid crystal display + L298N control module + DC motor + DS18B20 temperature sensor
Specific functions:
(1) Realize the control of the motor by L298N, and use LCD1602 to display the temperature directly and clearly;
(2) Realize the control of the motor speed based on the measured temperature (using the motor to simulate the frequency conversion system of the air conditioner);
(3) In automatic mode, the higher the temperature, the higher the duty and the faster the revolution. In manual mode, the motor speed can be controlled by pressing the buttons.
3 Simulation diagram
4 programs
4.1 Project documents
4.2 code
main function
#include<REG52.h>
#include <intrins.h>
#define uchar unsigned char
#define uint unsigned int
uchar num=0;
bit flang;
sbit IN1=P3^5;
sbit IN2=P3^6;
sbit PWM1 =P3^7;//风扇控制引脚
uchar xianshi1[] ="TEMP 00.0C";// 内容
uchar xianshi2[] ="000% ";// 内容
uint wendu=0;
uchar count;
uchar jd=5;
bit work; //开关标志
sbit k1=P1^0; //
sbit k2=P1^1; //
sbit k3=P1^2; //
sbit DQ=P2^0; //定义DS18B20总线I/O
//Port Definitions**********************************************************
sbit LcdRs = P2^5;
sbit LcdRw = P2^6;
sbit LcdEn = P2^7;
sfr DBPort = 0x80; //P0=0x80,P1=0x90,P2=0xA0,P3=0xB0.数据端口
void delay(uint z)
{
uint a,b;
for(a=z;a>0;a--)
for(b=120;b>0;b--);
}
//向LCD写入命令或数据************************************************************
#define LCD_COMMAND 0 // Command
#define LCD_DATA 1 // Data
#define LCD_CLEAR_SCREEN 0x01 // 清屏
#define LCD_HOMING 0x02 // 光标返回原点
void LCD_Write(bit style, unsigned char input)
{
LcdEn=0;
LcdRs=style;
LcdRw=0; _nop_();
DBPort=input; _nop_();//注意顺序
LcdEn=1; _nop_();//注意顺序
LcdEn=0; _nop_();
delay(1);
}
//设置显示模式************************************************************
#define LCD_SHOW 0x04 //显示开
#define LCD_HIDE 0x00 //显示关
#define LCD_CURSOR 0x02 //显示光标
#define LCD_NO_CURSOR 0x00 //无光标
#define LCD_FLASH 0x01 //光标闪动
#define LCD_NO_FLASH 0x00 //光标不闪动
void LCD_SetDisplay(unsigned char DisplayMode)
{
LCD_Write(LCD_COMMAND, 0x08|DisplayMode);
}
//设置输入模式************************************************************
#define LCD_AC_UP 0x02
#define LCD_AC_DOWN 0x00 // default
#define LCD_MOVE 0x01 // 画面可平移
#define LCD_NO_MOVE 0x00 //default
void LCD_SetInput(unsigned char InputMode)
{
LCD_Write(LCD_COMMAND, 0x04|InputMode);
}
//初始化LCD************************************************************
void LCD_Initial()
{
LcdEn=0;
LCD_Write(LCD_COMMAND,0x38); //8位数据端口,2行显示,5*7点阵
delay(5);
LCD_Write(LCD_COMMAND,0x38);
delay(5);
LCD_SetDisplay(LCD_SHOW|LCD_NO_CURSOR); //开启显示, 无光标
delay(5);
LCD_Write(LCD_COMMAND,LCD_CLEAR_SCREEN); //清屏
delay(5);
LCD_SetInput(LCD_AC_UP|LCD_NO_MOVE); //AC递增, 画面不动
delay(5);
}
//液晶字符输入的位置************************
void GotoXY(unsigned char x, unsigned char y)
{
if(y==0)
LCD_Write(LCD_COMMAND,0x80|x);
if(y==1)
LCD_Write(LCD_COMMAND,0x80|(x-0x40));
}
//将字符输出到液晶显示
void Print(unsigned char *str)
{
while(*str!='\0')
{
LCD_Write(LCD_DATA,*str);
str++;
delay(1);
}
}
void init()// 定时器初始化
{
TMOD=0x01;
TH0=TL0=(256-200);
ET0=1;//开定时器0中断
TR0=1;
EA=1;//开总中断
}
void Delay_DS18B20(int num);
/*****初始化DS18B20*****/ //探头1
void Init_DS18B20()
{
unsigned char x;
DQ=1; //DQ复位
Delay_DS18B20(8); //稍做延时
DQ = 0; //单片机将DQ拉低
Delay_DS18B20(80); //精确延时，大于480us
DQ = 1; //拉高总线
Delay_DS18B20(14);
x = DQ; //稍做延时后，如果x=0则初始化成功，x=1则初始化失败
Delay_DS18B20(20);
}
/*****延时子程序*****/
void Delay_DS18B20(int num)
{
while(num--) ;
}
/*****写一个字节*****/
void WriteOneChar(unsigned char dat)
{
unsigned char i=0;
for (i=8; i>0; i--)
{
DQ = 0;
DQ = dat&0x01;
Delay_DS18B20(5);
DQ = 1;
dat>>=1;
}
}
/*****读一个字节*****/
unsigned char ReadOneChar(void)
{
unsigned char i=0;
unsigned char dat = 0;
for (i=8;i>0;i--)
{
DQ = 0; // 给脉冲信号
dat>>=1;
DQ = 1; // 给脉冲信号
if(DQ)
dat|=0x80;
Delay_DS18B20(4);
}
return(dat);
}
/*****读取温度*****/
unsigned int ReadTemperature(void) //读取温度并转换
{
unsigned char a=0;
unsigned char b=0;
unsigned int t=0;
unsigned int tempb20;
float f_temp=0;
Init_DS18B20();
WriteOneChar(0xCC); //跳过读序号列号的操作
WriteOneChar(0x44); //启动温度转换
Init_DS18B20();
WriteOneChar(0xCC); //跳过读序号列号的操作
WriteOneChar(0xBE); //读取温度寄存器
a=ReadOneChar(); //读低8位
b=ReadOneChar(); //读高8位
tempb20=b;
tempb20<<=8;
tempb20=tempb20|a;
if((b&0xfc)==0xfc)//负温度
{
flang=1;
tempb20=((~tempb20)+1);
f_temp=tempb20*0.0625;
tempb20=f_temp*10+0.5;
}
else//正温度
{
flang=0;
f_temp=tempb20*0.0625;
tempb20=f_temp*10+0.5;
}
return tempb20;
}
main()
{
uchar k;
LCD_Initial();
PWM1=0;
IN1=0;
IN2=1;
init();
while(1)
{
if(k==0)
{
EA=0;
wendu=ReadTemperature();//读取温度数据
EA=1;
}
if(k++>25) k=0;
if(k1)
{
if(wendu>=270)
{
jd=(wendu/10)-27;
}
else jd=0;
}
else
{
if(k2==0)//PWM+
{
delay(10);
jd++;
if(jd>=10)jd=10;
while(k2==0);
}
if(k3==0)//PWM-
{
delay(10);
if(jd>0) jd--;
while(k3==0);
}
}
if(flang==1)
xianshi1[10]='-';
else
xianshi1[10]=' ';
xianshi1[11]=wendu/100+0x30;
xianshi1[12]=wendu/10%10+0x30;
xianshi1[14]=wendu%10+0x30;
xianshi2[0]=jd/10+0x30;
xianshi2[1]=jd%10+0x30;
GotoXY(0,0);
Print(xianshi1);
GotoXY(0,1);
Print(xianshi2);
}
}
5 Schematic
The schematic diagram is drawn by AD, and there are differences between the schematic diagram and the simulation diagram. The schematic diagram requires a power supply and a power switch module. The design information is detailed, and the hardware manual information and pictures are detailed. I am not responsible for hardware debugging, and some basic skills are required to make the real thing.
6 Components list
-
Universal board 9*15
-
DC power socket
-
Self-locking switch
-
2.2K resistor*1
-
STC89C51 microcontroller
-
40-pin IC seat
-
DC power cord
-
L298N driver chip
-
LCD1602 liquid crystal display
-
10K exclusion (103)
-
10K resistor*2
-
10uF capacitor
-
button*2
-
Single Pole Double Throw Switch
-
12M crystal oscillator
-
30Pf ceramic capacitor*2
-
3.3V DC motor
-
wire
-
Solder
-
DS18B20 temperature sensor
-
One piece of universal board
7 video explanation
Code explanation + simulation explanation + simulation demonstration + schematic diagram explanation
8 Information list
Download address: Watch the video at the top of the article.