1、具体介绍

本设计由DS18B20温度传感器+MQ-2烟雾传感器+HC-SR501人体红外模块+SIM800C GSM模块+LCD1602显示屏组成。

功能介绍：

（1）可检测环境温度、烟雾浓雾和人体信号并通过显示屏显示；

（2）可通过按键设置报警值，当检测值超过报警值时进行报警；

（3）报警可通过LED+蜂鸣器现场报警，显示屏显示报警内容；还可通过GSM模块实现远程报警，短息可显示不同报警内容。

2、实物图：

3、电路图：

4、部分代码

#include<reg52.h>#include<intrins.h>#include "sim800.h"#define uchar unsigned char#define uint unsigned int#define K_MG_MV 120/66 typedef unsigned char U8; /* defined for unsigned 8-bits integer variable 无符号8位整型变量 */typedef unsigned int U16;/* defined for unsigned 16-bits integer variable 无符号16位整型变量 *//********测试GSM是否启动**********/int test_boot;/********测试GSM是否注册网络**********/int test_net_register;/********GSM串口接收数据缓存**********/unsigned char idata GSM_receive[60];/********GSM串口接收计数器**********/unsigned char GSMDATA_count;unsigned char *content_temp = "Warning: over temperature\r\n";unsigned char *content_smoke = "Warning: excessive smoke concentration\r\n";unsigned char *content_body = "Warning: body entry\r\n";unsigned char str_yw[12];//烟雾值unsigned char T_baojing = 30; //温度报警值unsigned int C_baojing = 500; //烟雾浓度报警值unsigned char T_buff[3]; //报警缓存unsigned char H_buff[3];unsigned char C_buff[4];bit sf_flag=0; //设防标志unsigned char moshi=0;unsigned char data1;long Value;sbit bADcs=P3^4;sbit bADcl=P3^6;sbit bADda=P3^5;sbit sf_led = P1^3;// 设防指示灯sbit shefang= P1^4;// 设防按键sbit shezhi = P1^5; // 设置sbit jia = P1^6; // 加sbit jian = P1^7; // 减sbit BUZZER = P2^0; // LED蜂鸣器sbit Infra = P3^2; // 人体红外模块unsigned char IntToString(unsigned char *str, int dat);extern bit Start18B20();extern bit Get18B20Temp(int *temp);// ；；；；；、‘ extern void InitLcd1602();extern void LcdShowStr(unsigned char x, unsigned char y, unsigned char *str);float intT, decT; //温度值的整数和小数部分long kssj() //开始收集{unsigned char i;bADcs = 0;//当ADC0832未工作时其CS输入端应为高电平，此时芯片禁用.bADcl=0;bADda=1;bADcl=1;bADcl=0;//i downbADda=1;bADcl=1;bADcl=0;// 2 downbADda=0;bADcl=1;bADcl=0;// 3 downbADda=1;bADcl=1;bADcl=0;// 4 downfor(i=8;i>0;i--){data1<<=1;bADcl=0;bADcl=1;if(bADda==1) data1|=0x01;bADda=1;}bADcs=1;Value=data1*1.0/256*500;Value=Value*K_MG_MV;Value=Value-5;if(Value<0)Value=0;return Value;}void Key_set_scan(){if(shezhi==0){Delay_Ms(10);if(shezhi==0){ while(!shezhi);InitLcd1602();//初始化液晶moshi++;if(moshi >= 3)moshi = 0;if(moshi == 0){LcdShowStr(0, 0,"T: C");LcdShowStr(7, 0,"C: PPM");}else if(moshi == 1){LcdShowStr(0, 1,"Set_T: C");}else if(moshi == 2){LcdShowStr(0, 1,"Set_C: PPM");} }}if(jia==0){Delay_Ms(10);if(jia==0){ while(!jia);if(moshi==1){T_baojing++ ;if( T_baojing>=99 )T_baojing =99;}if(moshi==2){C_baojing++ ;if( C_baojing>=999 )C_baojing =999;}}}if(jian == 0){Delay_Ms(10);if(jian == 0){while(!jian);if(moshi==1){T_baojing-- ;if( T_baojing<=0 )T_baojing =0;}if(moshi==2){C_baojing-- ;if( C_baojing<=0 )C_baojing =0;}}}if(shefang == 0){Delay_Ms(10);if(shefang == 0){ while(!shefang);sf_flag =~ sf_flag;if(sf_flag == 1) //开启设防 sf_led = 0;else //关闭设防{ sf_led = 1;BUZZER = 1;}}}}void wendu(){ bit res;int temp; //读取到的当前温度值unsigned char len;unsigned char str_wd[5]; //温度缓冲区Get18B20Temp(&temp); //读取当前温度res = Get18B20Temp(&temp); //读取当前温度if (res)//读取成功时，刷新当前温度显示{intT = temp >> 4;//分离出温度值整数部分decT = temp & 0xF; //分离出温度值小数部分len = IntToString(str_wd, intT); //整数部分转换为字符串str_wd[len++] = '.'; //添加小数点decT = (decT*10) / 16; //二进制的小数部分转换为1位十进制位str_wd[len++] = decT + '0'; //十进制小数位再转换为ASCII字符str_wd[len] = '\0'; //添加字符串结束符LcdShowStr(2, 0, str_wd); //显示到液晶屏上}Start18B20();}/************主函数****************/void main(){ unsigned char i;sf_flag = 0;Uart_Init();InitLcd1602();//初始化液晶Start18B20();LcdShowStr(0,0," System init ");LcdShowStr(0,1," please wait ");for(i = 0;i < 15;i++)//等待网络稳定{Delay_Ms(1000);}InitLcd1602(); LcdShowStr(0, 0,"T: C");LcdShowStr(7, 0,"C: PPM");////测试是否已经开机，同时自适应波特率//while(test_boot==No)//{//Send_String("AT\r\n");//Delay_Ms(100);//}//test_boot=No;//////测试是否注册到网络//while(test_net_register==No)//{//Send_String("AT+CREG?\r\n"); //Delay_Ms(100);//}//test_net_register=No;Receive_message();//配置成接受短信模式while(1){Key_set_scan();//按键扫描if(moshi == 0) //设置模式切换{kssj(); //开始收集 ,电压采集检测烟雾浓度Value = Value-100;//烟雾浓度校准IntToString(str_yw,Value); //转换成字符串LcdShowStr(9, 0, str_yw); //烟雾浓度显示到液晶屏上wendu(); //温度检测并显示if(sf_flag == 1) //当开启设防时{if(Value>=C_baojing||intT>T_baojing||Infra==1) //有触发报警{ BUZZER = 0;Delay_Ms(1000);LcdShowStr(0, 1,"");if(intT > T_baojing){ /*1234567890123456*/LcdShowStr(0,1,"temp");Send_message(content_temp); //发温度超标短信} else LcdShowStr(0, 1," ");if(Value >= C_baojing){ /*1234567890123456*/LcdShowStr(5,1,"smoke"); Send_message(content_smoke); //发烟雾浓度超标短信} else LcdShowStr(5, 1,"");if(Infra == 1) {/*1234567890123456*/LcdShowStr(11, 1,"body"); Send_message(content_body); //发人体进入短信} else LcdShowStr(11,1," ");}else //没有触发报警{BUZZER = 1; /*1234567890123456*/LcdShowStr(0, 1," System normal ");}}}else if(moshi == 1)//设置温度上限模式{T_buff[0] = T_baojing/10+0x30;T_buff[1] = T_baojing%10+0x30;T_buff[2] = '\0';LcdShowStr(6, 1,T_buff);}else if(moshi == 2) //设置烟雾浓度上限模式{C_buff[0] = C_baojing/100+0x30;C_buff[1] = C_baojing%100/10+0x30;C_buff[2] = C_baojing%10+0x30;C_buff[4] = '\0';LcdShowStr(6, 1,C_buff);}}}/* 整型数转换为字符串，str-字符串指针，dat-待转换数，返回值-字符串长度 */unsigned char IntToString(unsigned char *str, int dat){signed char i = 0;unsigned char len = 0;unsigned char buf[6];if (dat < 0) //如果为负数，首先{dat = -dat;*str++ = '-';len++;}do {//先转换为低位在前的十进制数组buf[i++] = dat % 10;dat /= 10;} while (dat > 0);len += i;//i最后的值就是有效字符的个数while (i-- > 0) //将数组值转换为ASCII码反向拷贝到接收指针上{*str++ = buf[i] + '0';}*str = '\0'; //添加字符串结束符return len; //返回字符串长度}/*****************************************************************************串口中断/****************************************************************************/void uart(void) interrupt 4{unsigned char UART_data;if(RI){UART_data=SBUF;if(UART_data=='\n'){if(GSM_receive[0]=='O'&&GSM_receive[1]=='K'){test_boot=Yes;}//else//test_boot=No;if(GSM_receive[0]=='+'&&GSM_receive[1]=='C'&&GSM_receive[2]=='R'&&GSM_receive[3]=='E'&&GSM_receive[4]=='G'){if(GSM_receive[7]=='1'||GSM_receive[9]=='1'||GSM_receive[9]=='5'){test_net_register=Yes;}} //else// test_net_register=No;if((GSM_receive[0]=='O')&&(GSM_receive[1]=='K')) //大写OK{ // sf_flag = 0;//sf_led = 1;//BUZZER = 1;}if((GSM_receive[0]=='C')&&(GSM_receive[1]=='L')&&(GSM_receive[2]=='O')&&(GSM_receive[3]=='S')&&(GSM_receive[4]=='E')){// CZ = 1;LcdShowStr(5, 1,"Close"); }GSMDATA_count=0;}else{GSM_receive[GSMDATA_count]=UART_data;GSMDATA_count++;}}RI=0;}