基于STM32单片机的管道天然气监测原理图PCB

功能介绍：
0.本系统采用STC89C52作为单片机
1.采用LCD1602液晶作为系统的显示器可实时显示数据
2.系统设计了蜂鸣器和LED组成的声光报警电路，当检测到天然气泄漏，可实现声光报警
3.除了现场的声光报警，系统还可以通过GSM模块实现无线报警
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：

#define __MAIN_C
#include "main.h"
#include "stdio.h"
#include "stm32f10x.h"
#include "stm32f10x_gpio.h"
#include "bsp_gpio.h"
#include "bsp_clkconfig.h"
#include "bsp_delay.h"
#include "bsp_lcd1602.h"
#include "bsp_GeneralTim.h" 
#include "bsp_key.h"
#include "bsp_usart.h"

volatile CreatByte Flag;

int flowA = 0;
int flowB = 0;

unsigned int time500ms = 0;

char dis[16];

int main(void)
{	
    // 使用HSI，SYSCLK = 4M * RCC_PLLMul_x, x:[2,3,...16],最高是64MH
    HSI_SetSysClock(RCC_PLLMul_2); //使用内部8MHz晶振，并设置PLL输出为8MHz

    // GPIO端口初始化
    GPIO_Config();
    Key_GPIO_Config();
    LCD_GPIO_Init();

    LCD_Init();
    LCD_Clear();
    DelayMs(250);
    LCD_DispStr(0, 0, "    Welcome!    ");

    USART_Config();
    DelayMs(50);

    printf("AT+CMGF=1\r\n");
    DelayMs(1000); //延时等待gsm稳定

    LCD_Clear();

    GENERAL_TIM_Init(); //初始化定时器

    sprintf(dis, "Flow A:%3d B:%3d", flowA, flowB);
    LCD_DispStr(0, 0, dis);
    LCD_DispStr(0, 1, "Gas:Normal  ");
    LCD_DispStr(13, 1, "OFF");

    while (1)
    {    
        //每秒钟更新数据

        if (refreshFlag == 1)
        {
            refreshFlag = 0;
        
            sprintf(dis, "Flow A:%3d B:%3d", flowA, flowB);
            LCD_DispStr(0, 0, dis);
            
            if (startFlag == 1)
            {
                if (flowA > flowB + 5 || flowA < flowB - 5) //流量误差大于5则判断泄漏
                {
                    alarmFlag = 1; //报警
                    LCD_DispStr(0, 0, "Flow   Warning! ");
                }
                flowA = 0;
                flowB = 0;
                
                if (MQ2_IN == 0) //监测到天然气含量过高
                {
                    time500ms++;
                    if (time500ms > 4) //2s后仍检测到，则确认检测到天然气，否则认为误报
                    {
                        alarmFlag = 1; //报警
                        LCD_DispStr(0, 1, "Gas:Warning!");
                        time500ms = 0;
                    }
                }
                else
                {
                    LCD_DispStr(0, 1, "Gas:Normal  ");
                    time500ms = 0;
                }
                LCD_DispStr(13, 1, " ON");

                if (alarmFlag == 1)
                {
                    BUZZER_ON; //打开蜂鸣器
                    RELAY_OFF; //关闭阀门
                    startFlag = 0; //停止标志
                    
                    
                    LCD_DispStr(13, 1, "OFF");

                    /************************* 发送短信 *************************/
                    printf("AT+CMGF=1\r\n");
                    DelayMs(1000);
                    printf("AT+CSCS=\"GSM\"\r\n");
                    DelayMs(1000);
                    printf("AT+CMGS=\"+86xxxxxxxxxxx\"\r\n"); //可以修改电话号码
                    DelayMs(1000);
                    printf("Please be aware of pipe leaks!\x1a"); //可以修改短信内容
                    DelayMs(1000);
                } 
            }
            

        }
        
        KeyProcess();
    }
}


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实物演示视频：
https://www.bilibili.com/video/BV14r4y147Yo/