分享一个很好的蓝牙+PM2.5空气质量+DHT11温湿度上下限报警的设计，主控芯片是51单片机.
实物图：
仿真原理图如下（proteus仿真工程文件可到本帖附件中下载）
元件列表：
| Comment | Designator | LibRef | Quantity | | 蜂鸣器 | BUUZER | BUZZER | 1 | | 电解电容 | C1 | 10uF | 1 | | 电解电容 | C2 | 220uF | 1 | | 瓷片电容 | C3, C4 | 18pF | 2 | | 电解电容 | C5 | 470uF | 1 | | 瓷片电容 | C6 | 104 | 1 | | 排针 | DC 5V | Header 2 | 2P | | 触点开关 | JIA, JIAN，RESET | SW-PB | 3 | | 液晶 | LCD1602 | LCD1602 | 1 | | 发光二极管 | LED1, POWER | SI3317-H | 2 | | 灰尘传感器 | PM1 | GP2Y1010AU | 1 | | 温湿度传感器 | U3 | dht11 | 1 | | 三极管 | Q1 | S8550 | 1 | | 排阻 | R1 | 4.7K | 1 | | 电阻 | R2, R4, R5, R6 | 2K | 5 | | 电阻 | R10 | 150 | 1 | | 电阻 | R3 | 10K | 1 | | 自锁开关 | SW1 | SW-SPDT | 1 | | 单片机座 | U1 | DIP-40 | 1 | | 单片机 | U1 | STC89C52 | 1 | | A/D模数转换芯片 | U2 | ADC0832 | 1 | | 晶振 | Y1 | 11.0592M | 1 |
Altium Designer画的空气质量+dht11检测系统原理图和PCB图如下：(51hei附件中可下载工程文件)
单片机源程序如下:
- #include"LCD1602.h" //添加LCD1602头文件
- #include"dht11.h" //添加DHT11头文件
- #include"adc0832.h"
- #include<math.h>
- sbit BUZZER = P1^3; //蜂鸣器驱动端口==P1^3
- sbit Reduc = P3^2; //按键键输入端口==P1^7
- sbit Add = P3^3; //按键加输入端口==P3^1
- sbit Mode = P3^4; //按键加输入端口==P3^1
- sbit LED1=P2^0;
- sbit LED2=P2^1;
- uchar Rx_buf[4],Rxnum=0;
- uchar T1L=15,T1H=35,R1L=30,R1H=80;
- void InitUART(void) //这是串口的基本配置，配置他的波特率是9600.这些参数都是标准的。
- {
- TMOD = 0x20;
- SCON = 0x50;
- TH1 = 0xFD;
- TL1 = TH1;
- PCON = 0x00;
- EA = 1;
- ES = 1;
- TR1 = 1;
- }
- /*
- * UART 发送一字节
- */
- void UART_send_byte(char dat)
- {
- SBUF = dat;
- while (TI == 0);
- TI = 0;
- }
- /*
- * UART 发送字符串
- */
- void UART_send_string(unsigned char *buf)
- {
- while (*buf != '\0')
- {
- UART_send_byte(*buf++);
- }
- }
- /************************************************
- ** 函数名称 ： void main(void)
- ** 函数功能 ： 主函数
- ** 输 入 ： 无
- ** 输 出 ： 无
- ** 说 明 ：
- ************************************************/
- void main(void)
- {
- double PM,pm1,pm2;
- int PMVAL=0,HPM=200,PM_count=0,pm1_count=0;
- uchar T1_data=0,R1_data=0,T2_data=0,R2_data=0;//温度、湿度变量
- uchar shezhi_flag=1,Mode_flag=1,n=1;//设置变量
- uchar bueezr_flag=0,count=0,buzzer_time=9;//蜂鸣器报警变量
- uint Mode_count=0;
- uchar disp[16] ={"PM2.5:0000ug/m3 "};
- uchar disp1[16]= {"T :00C RH:00%"};
- uchar Tx_Buf[15];
- InitUART(); //初始化串口
- LCD_Init();
- WriteChar(1,0,16,disp); //在第一行显示‘内容’
- WriteChar(2,0,16,disp1); //在第二行显示‘内容’
- while(1)
- {
-
- T1_data=Read_TRH(0,0);//温度
- disp1[3]=T1_data/10+0x30;//十位
- disp1[4]=T1_data%10+0x30;//个位
- R1_data=Read_TRH(1,0);//湿度
- disp1[13]=R1_data/10+0x30;//十位
- disp1[14]=R1_data%10+0x30;//个位
-
- pm1+=read_data(1);
- if(++PM_count>=20)
- {
- PM_count=0;
- pm1=pm1/20;
- pm2+=pm1;
- pm1=0;
- if(++pm1_count>=5)
- {
- pm1_count=0;
- PM=pm2/5;
- PM=PM*50/255;
- PM-=4;
- PM/=5;
- PM*=1000;
- PMVAL=PM;
- PMVAL+=235; PMVAL=PMVAL/9;
- if(PMVAL>=9999)PMVAL=9999;
- WriteCOMDATA(0x86,0);
- if(PMVAL<0)//PMVAL=0;
- {WriteCOMDATA(0+0x30,1);PMVAL=abs(PMVAL);}
- else WriteCOMDATA(PMVAL/1000+0x30,1);
- WriteCOMDATA(PMVAL/100%10+0x30,1);
- WriteCOMDATA(PMVAL/10%10+0x30,1);
- WriteCOMDATA(PMVAL%10+0x30,1);
- PM=pm1=pm2=0;
- }
- }
- /*调用报警函数，温湿度是否在设定范围内*/
- //温度值与报警值比较
- if(T1_data<T1L)
- {
- bueezr_flag=1;//报警标志位置1
- }
- else if(T1_data>T1H)
- {
- bueezr_flag=1;//报警标志位置1
- }
- //湿度值与报警值比较
- if(R1_data<R1L)
- {
- bueezr_flag=1;//报警标志位置1
- }
- else if(R1_data>R1H)
- {
- bueezr_flag=1;//报警标志位置1
- }
- //PM值与报警值比较
- if(PMVAL>HPM)
- {
- bueezr_flag=1;
- }
- if(T1_data>T1L&&T1_data<T1H && R1_data>R1L&&R1_data<R1H && PMVAL<HPM)
- {
- bueezr_flag=0;
- BUZZER=1;
- }
- /*******蜂鸣器报警********/
- count++;if(count>buzzer_time*10)count=buzzer_time+1;
- if(count%buzzer_time==0 && bueezr_flag)
- {
- BUZZER=~BUZZER;//蜂鸣器取反 发出声音提示
- }
-
- /*******Mode键设置报警参数********/
- if(Mode==0 && Mode_flag)
- {
- WriteCOMDATA(0x0F,0);//LCD显示光标
- Delay(100);
- if(Mode==0)
- {
- BUZZER=1;
- bueezr_flag=0;
- Mode_flag=0;
- shezhi_flag=1;
- n=1;
- while(1)
- {
- switch(shezhi_flag)
- {
- case 1:
- if(n)
- {
- n=0;
- WriteChar(1,0,16,"T1L:00C T1H:00C");//在第一行显示内容
- WriteChar(2,0,16,"R1L:00% R1H:00%");//在第二行显示内容
- WriteCOMDATA(0x8D,0);WriteCOMDATA(T1H/10+0x30,1);
- WriteCOMDATA(0x8E,0);WriteCOMDATA(T1H%10+0x30,1);
- WriteCOMDATA(0xC4,0);WriteCOMDATA(R1L/10+0x30,1);
- WriteCOMDATA(0xC5,0);WriteCOMDATA(R1L%10+0x30,1);
- WriteCOMDATA(0xCD,0);WriteCOMDATA(R1H/10+0x30,1);
- WriteCOMDATA(0xCE,0);WriteCOMDATA(R1H%10+0x30,1);
- }
- WriteCOMDATA(0x84,0);WriteCOMDATA(T1L/10+0x30,1);
- WriteCOMDATA(0x85,0);WriteCOMDATA(T1L%10+0x30,1);
- WriteCOMDATA(0x85,0);
- break;
- case 2:
- WriteCOMDATA(0x8D,0);WriteCOMDATA(T1H/10+0x30,1);
- WriteCOMDATA(0x8E,0);WriteCOMDATA(T1H%10+0x30,1);
- WriteCOMDATA(0x8E,0);
- break;
- case 3:
- WriteCOMDATA(0xC4,0);WriteCOMDATA(R1L/10+0x30,1);
- WriteCOMDATA(0xC5,0);WriteCOMDATA(R1L%10+0x30,1);
- WriteCOMDATA(0xC5,0);
- break;
- case 4:
- WriteCOMDATA(0xCD,0);WriteCOMDATA(R1H/10+0x30,1);
- WriteCOMDATA(0xCE,0);WriteCOMDATA(R1H%10+0x30,1);
- WriteCOMDATA(0xCE,0);
- break;
- case 5:
- if(n)
- {
- n=0;
- WriteChar(1,0,16," PM2.5 SET ");//在第一行显示内容
- WriteChar(2,0,16,"HPM2.5: ug/m3");//在第二行显示内容
- }
- WriteCOMDATA(0xC7,0);
- WriteCOMDATA(HPM/1000+0x30,1);
- WriteCOMDATA(HPM/100%10+0x30,1);
- WriteCOMDATA(HPM/10%10+0x30,1);
- WriteCOMDATA(HPM%10+0x30,1);
- WriteCOMDATA(0xCA,0);
- break;
- }
- Delay(200);
- //加
- if(Reduc==0)
- {
- Delay(200);
- //while(Reduc==0);
- switch(shezhi_flag)
- {
- case 1:T1L+=1;break;
- case 2:T1H+=1;break;
- case 3:R1L+=1;break;
- case 4:R1H+=1;break;
- case 5:HPM+=1;break;
- }
- }
- //减
- if(Add==0)
- {
- Delay(200);
- //while(Add==0);
- switch(shezhi_flag)
- {
- case 1:T1L-=1;break;
- case 2:T1H-=1;break;
- case 3:R1L-=1;break;
- case 4:R1H-=1;break;
- case 5:HPM-=1;break;
- }
- }
- //短按切换设置项目 长按退出设置页面
- if(Mode==0)
- {
- Delay(300);
- while(Mode==0)
- {
- Delay(300);
- Mode_count++;
- if(Mode_count>6)
- {
- WriteChar(1,0,16,"PM2.5:0000ug/m3 ");//在第一行显示内容
- WriteCOMDATA(0x86,0);
- if(PMVAL<0)//PMVAL=0;
- {WriteCOMDATA(0+0x30,1);PMVAL=abs(PMVAL);}
- else WriteCOMDATA(PMVAL/1000+0x30,1);
- WriteCOMDATA(PMVAL/100%10+0x30,1);
- WriteCOMDATA(PMVAL/10%10+0x30,1);
- WriteCOMDATA(PMVAL%10+0x30,1);
- WriteChar(2,0,16,disp1); //在第二行显示内容
- }
- }
- if(Mode_count>6)
- {
- Mode_count=0;shezhi_flag=0;
- //当下限值大于上限值时，蜂鸣器鸣叫1S提示，参数设置有误
- if(T1L>T1H || R1L>R1H)
- {
- BUZZER=0;Delay(1000);BUZZER=1;
- }
- //否则退出设置页面，返回主页面
- else
- {
- WriteCOMDATA(0x0C,0);//关闭LCD光标
- Delay(10);
- n=0;
- break;
- }
- }
- else Mode_count=0;
- shezhi_flag++;
- if(shezhi_flag>5)shezhi_flag=1;
- if(shezhi_flag==1 || shezhi_flag==5)n=1;
- pm1+=read_data(1);
- if(++PM_count>=20)
- {
- PM_count=0;
- pm1=pm1/20;
- pm2+=pm1;
- pm1=0;
- if(++pm1_count>=15)
- {
- pm1_count=0;
- PM=pm2/15;
- PM=PM*50/255;
- PM-=4;
- PM/=5;
- PM*=1000;
- PMVAL=PM;
- PMVAL-=480; PMVAL=PMVAL/3;
- if(PMVAL>=9999)PMVAL=9999;
- PM=pm1=pm2=0;
- }
- }
- }
- }
- }
- }
- /********LCD1602显示********/
- //WriteChar(1,0,16,disp); //在第一行显示‘内容’
- WriteChar(2,0,16,disp1); //在第二行显示‘内容’
- if(Mode_flag==0){Mode_count++;if(Mode_count>20){Mode_count=0;Mode_flag=1;}}
- Tx_Buf[0]='T'; //帧头
- Tx_Buf[1]=T1_data/10%10+0x30; //将温湿度数据送往发送数组,送给蓝牙模块让手机APP显示
- Tx_Buf[2]=T1_data%10+0x30;
- Tx_Buf[3]=R1_data/10%10+0x30;
- Tx_Buf[4]=R1_data%10+0x30;
- Tx_Buf[5]=PMVAL/1000+0x30; //将温湿度数据送往发送数组,送给蓝牙模块让手机APP显示
- Tx_Buf[6]=PMVAL/100%10+0x30;
- Tx_Buf[7]=PMVAL/10%10+0x30;
- Tx_Buf[8]=PMVAL%10+0x30;
- Tx_Buf[9]=0;//结束符
- Tx_Buf[10]=0;//结束符
- Tx_Buf[11]=0;//结束符
- UART_send_string( Tx_Buf); //串口发送温湿度数据出去
- }
- }
- /*****************串口接收中断函数,接收蓝牙模块的数据*********************/
- void UARTInterrupt(void) interrupt 4
- {
- ES=0; //关闭中断
- if(RI) //接收到数据
- {
- Rx_buf[Rxnum]=SBUF; //接收数据进数组
- if(Rx_buf[Rxnum]==0x08)
- Rxnum=0;
- else
- Rxnum++;
- if(Rx_buf[0]==0x01)//LED1灯
- {
- if(Rx_buf[1]==0x01)//开灯
- LED1=0;//开灯
- else
- LED1=1; //关灯
- }
- if(Rx_buf[0]==0x02)//LED2灯
- {
- if(Rx_buf[1]==0x01)//开灯
- LED2=0;//开灯
- else
- LED2=1; //关灯
- }
- }
- RI=0;
-
- ES=1; //关闭中断
- }
-
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