基于51单片机的智能饮水机烧水控制系统proteus仿真原理图PCB

功能介绍：
0.本系统采用STC89C52作为单片机
1.LCD1602液晶实时显示当前温度和设定温度
2.当温度到达100℃时，蜂鸣器报警提醒水烧开了
3.按键可更改预设温度值，当温度低于设定温度5℃时，
启动加热，直至加热到设定值，停止加热，启动保温的作用

原理图：

PCB：

主程序：

#include <reg52.h> //包含头文件，一般情况不需要改动，头文件包含特殊功能寄存器的定义
#include <stdio.h>
#include "18b20.h"
#include "lcd1602.h"
#include "delay.h"

sbit KEY_SET = P3^3; //引脚定义
sbit KEY_SUB = P3^6;
sbit KEY_ADD = P3^4;
sbit KEY_SWITCH = P3^5;

sbit RELAY_WATER = P2^0;
sbit RELAY_HEAT = P2^1;

sbit BUZZER = P2^2;

sbit WATER_CHECK = P1^1;

#define ON 0
#define OFF 1

int waterTime = 0; //加水时间
int tempBuf = 0;                   //读取温度值
float temperature;              //实际温度值
float setTemp = 100.0;              //预设温度
bit refreshFlag = 0; //定义读温度标志
bit heatSwitch = OFF; //加热开关

char dis0[16]; //定义显示区域临时存储数组

void CheckKey(void);
void Timer0_Init(void); //定时器初始化

void main(void)
{
    bit ack = 0;
    
    Timer0_Init();
    LCD_Init();   //初始化液晶
    DelayMs(200); //延时有助于稳定
    LCD_Clear();  //清屏


    while (1) //主循环
    {
        
        if (refreshFlag == 1) //1s刷新一次数据
        {
            refreshFlag = 0;
            //TR0 = 0;

            if (WATER_CHECK == 0) //检测到没有水
            {
                DelayMs(20); //防抖
                if (WATER_CHECK == 0) //确定没有水了
                {
                    waterTime = 60; //加水60s
                    heatSwitch = OFF; //关闭加热开关
                }
                    
            }
            if (waterTime != 0)
            {
                waterTime--;
                RELAY_WATER = ON; //加水
            }
            else
            {
                RELAY_WATER = OFF;
            }

            DS18B20_Start();
            ack  = DS18B20_GetTemp(&tempBuf); //检测温度
            if (ack == 1)
            {
                temperature = (float)tempBuf * 0.0625; //温度值转换
            }
            else 
            {
                temperature = 0;
            }

            if (heatSwitch == ON) //加热开关打开
            {
                if (temperature < setTemp - 5) //低于设定温度5℃，启动加热
                {
                    RELAY_HEAT = ON;
                }
                else if (temperature >= setTemp) //直接大于等于设定温度，停止加热
                {
                    RELAY_HEAT = OFF;
                }
                
                if (temperature >= 100) //温度达到100℃，蜂鸣器报警
                {
                    BUZZER = ON;
                }
                else
                {
                    BUZZER = OFF;
                }
            }
            else //加热开关关闭
            {
                RELAY_HEAT = OFF;
                BUZZER = OFF;
            }

            sprintf(dis0, "Set Temp:%5.1f", setTemp); //打印温度值
            LCD_DispStr(0, 0, dis0);             //显示
            LCD_DispOneChar(14, 0, 0xdf); //写入温度右上角点
            LCD_DispOneChar(15, 0, 'C'); //写入温度C

            sprintf(dis0, "Temp:%5.1f", temperature); //打印温度值
            LCD_DispStr(0, 1, dis0);             //显示
            LCD_DispOneChar(10, 1, 0xdf); //写入温度右上角点
            LCD_DispOneChar(11, 1, 'C'); //写入温度C

            if (heatSwitch == ON) //显示加热开关
            {
                sprintf(dis0, "  ON", temperature); //打印温度值
                LCD_DispStr(12, 1, dis0);             //显示
            }
            else
            {
                sprintf(dis0, " OFF", temperature); //打印温度值
                LCD_DispStr(12, 1, dis0);             //显示
            }

            //TR0 = 1;
        }

        CheckKey();            //检测按键
    }
}

void CheckKey(void)
{
    if (KEY_SWITCH == 0) //检测到按键按下
    {
        DelayMs(10); //小抖动
        if (KEY_SWITCH == 0) //开关按键
        {
            heatSwitch = ~heatSwitch; //加热开关控制
        }
        while (KEY_SWITCH == 0);
    }
    
    if (KEY_SUB == 0) //减值键
    {
        DelayMs(200); 
        if (KEY_SUB == 0) //减值键
        {
            setTemp--;
            if (setTemp < 20)
            {
                setTemp = 100;
            }
            sprintf(dis0, "Set Temp:%5.1f", setTemp); //打印温度值
            LCD_DispStr(0, 0, dis0);             //显示
        }
        
    }
    
    if (KEY_ADD == 0) //加值键
    {
        DelayMs(200); 
        if (KEY_ADD == 0) //减值键
        {
            setTemp++;
            if (setTemp > 100)
            {
                setTemp = 20;
            }
            sprintf(dis0, "Set Temp:%5.1f", setTemp); //打印温度值
            LCD_DispStr(0, 0, dis0);             //显示
        }
    }
}

/*------------------------------------------------
                    定时器初始化子程序
------------------------------------------------*/
void Timer0_Init(void)
{
    TMOD |= 0x01; //使用模式1，16位定时器，使用"|"符号可以在使用多个定时器时不受影响
    TH0 = (65536 - 18432) / 256; //重新赋值 20ms
    TL0 = (65536 - 18432) % 256;
    EA = 1;  //总中断打开
    ET0 = 1; //定时器中断打开
    TR0 = 1; //定时器开关打开
}
/*------------------------------------------------
                定时器中断子程序
------------------------------------------------*/
void Timer0_Interrupt(void) interrupt 1
{
    static unsigned char time20ms  = 0;
    TH0 = (65536 - 18432) / 256; //重新赋值 20ms
    TL0 = (65536 - 18432) % 256;
    time20ms++;

    if (time20ms > 50)
    {
        time20ms = 0;
        refreshFlag = 1; //读标志位置1
    }
}

仿真演示视频：
https://www.bilibili.com/video/BV1Yr4y147N8/

实物演示视频：
https://www.bilibili.com/video/BV1Kr4y147cm/