功能：
0.本系统采用STC89C52作为单片机
.LCD1602液晶实时显示当前温度和烟雾浓度
2.超过温度阈值和烟雾浓度阈值，蜂鸣器报警
3.按键可更改温度阈值和烟雾浓度阈值
4.采用DC002作为电源接口可直接输入5V给整个系统供电
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 "tlc0832.h"#include "lcd1602.h"#include "delay.h"sbit KEY_SET = P3^4; //引脚定义sbit KEY_SUB = P3^6;sbit KEY_ADD = P3^5;sbit KEY_ENTER = P3^7;sbit BUZZER = P2^0;#define BUZZER_ON (BUZZER = 0)#define BUZZER_OFF (BUZZER = 1)unsigned char dispFlag = 0; //更新显示标志unsigned char setFlag = 0; //设置参数标志int tempBuf = 0; //读取温度值float temperature; //实际温度值int temperatureMax = 50; //温度阈值bit readTempFlag = 0; //定义读温度标志int Conc = 0;int MaxConc = 40;char dis0[16]; //定义显示区域临时存储数组char dis1[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LCD_DispStr(0, 0, "T:C S: %");LCD_DispOneChar(7, 0, 0xdf); //写入温度右上角点sprintf(dis0, " ST:%3d SS:%3d%%", temperatureMax, MaxConc); //打印温度值LCD_DispStr(0, 1, dis0); //显示第二行while (1) //主循环{CheckKey(); //检测按键if (readTempFlag == 1) //读取温度标志{readTempFlag = 0;TR0 = 0;DS18B20_Start();ack = DS18B20_GetTemp(&tempBuf);if (ack == 1){temperature = (float)tempBuf * 0.0625; //温度值转换}else {temperature = 0;} sprintf(dis0, "%5.1f", temperature); //打印温度值LCD_DispStr(2, 0, dis0); //显示第二行TR0 = 1;}if (dispFlag == 1){dispFlag = 0;TR0 = 0;Conc = ReadADC(AIN0_GND);if (Conc <= 29){Conc = 29;}Conc = (100 * (Conc-29)) / 227; //计算有害气体浓度百分比sprintf(dis1, "%3d", Conc); //打印浓度值LCD_DispStr(12, 0, dis1); //显示第二行if (setFlag == 1){LCD_DispStr(0, 1, ">");LCD_DispStr(8, 1, " ");}else if (setFlag == 2){LCD_DispStr(0, 1, " ");LCD_DispStr(8, 1, ">");}else{LCD_DispStr(0, 1, " ");LCD_DispStr(8, 1, " ");}TR0 = 1;}if ((temperature > temperatureMax) || (Conc > MaxConc)) //温度超高{BUZZER_ON;}else //正常温度{BUZZER_OFF;}}}void CheckKey(void){static unsigned char rekey = 0;if ((KEY_SET == 0) || (KEY_SUB == 0) || (KEY_ADD == 0) || (KEY_ENTER == 0)) //检测到按键按下{DelayMs(10); //小抖动if (rekey == 0){if (KEY_SET == 0) //检测是否按下{rekey = 1;setFlag++; //设置标志if (setFlag >= 3){setFlag = 1;}}else if (KEY_SUB == 0) //减键{rekey = 1;if (setFlag == 1) //处于设置1{if (temperatureMax > -45){temperatureMax = temperatureMax - 1;}}else if (setFlag == 2) //处于设置2{if (MaxConc > 0){MaxConc = MaxConc - 1;}}sprintf(dis0, " ST:%3d SS:%3d%%", temperatureMax, MaxConc); //打印温度值LCD_DispStr(0, 1, dis0); //显示第二行}else if (KEY_ADD == 0) //加键{rekey = 1;if (setFlag == 1) //处于设置1{if (temperatureMax < 128){temperatureMax = temperatureMax + 1;}}else if (setFlag == 2) //处于设置2{if (MaxConc < 99){MaxConc = MaxConc + 1;}}sprintf(dis0, " ST:%3d SS:%3d%%", temperatureMax, MaxConc); //打印温度值LCD_DispStr(0, 1, dis0); //显示第二行}else if (KEY_ENTER == 0) //检测是否按下{rekey = 1;setFlag = 0; //设置标志}}}else{rekey = 0; //防止重复检测到按键}}/*------------------------------------------------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 20msTL0 = (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 20msTL0 = (65536 - 18432) % 256;time20ms++;if (time20ms > 50){time20ms = 0;readTempFlag = 1; //读标志位置1}if (time20ms % 25 == 0){dispFlag = 1;}}
仿真演示视频：
/video/BV1EL411N7Q1/
实物演示视频：
/video/BV1wU4y1f7pn/
