1  Preface

        Now , The development of science and technology continues to expand the field of wireless communication , The widely used wireless communication technologies are UWB、Wifi、NFC、ZigBee wait , They all have different attributes and characteristics more or less , But in terms of networking capability and flexibility ,ZigBee Technology can have excellent development prospects . This design is based on artificial intelligence , Collect urban road data in real time with high accuracy , And take effective measures to remove dust and reduce temperature , It has promoted the development of urban informatization and improved people's happiness index , Improve people's healthy life with modern technology . The main goal of urban road dust removal and cooling system is to replace the traditional road cleaning method , Break through the barrier of traditional wiring , Realize modern road cleaning . Compared with the traditional wired communication, connect the detection node and the control node , It is more convenient to realize through wireless networking , Good compatibility . The development of the city has gone from the original sound basic facilities to today's refined management and is constantly moving towards a new level , This design will provide an efficient method for urban road environmental data monitoring and processing 、 Intelligent service platform .

2  The system realizes the function

• Networking of all sections ： Adopt star topology to space 50 M road greenbelt completed monitoring , Implement multiple ZigBee Terminal node and ZigBee Coordinator node networking .
• Real-time monitoring ： Realize the monitoring of all sections of urban roads PM2.5 Concentration and temperature , Monitor the water level of the reservoir in the road .
• Manual mode ： adopt ZigBee The key settings on the coordinator node adjust the... Of each road section according to the seasonal changes PM2.5 And temperature threshold , The dedusting and cooling devices of each road section can be switched on and off according to the user .
• Automatic mode ： When the road environment PM2.5 The concentration is higher than the optimal threshold in this season and there is water in the reservoir in this section , Automatically turn on the cooling and dust removal device ; When the road temperature is higher than the set value and there is water in the reservoir in this section , Automatically turn on the cooling and dust removal device .
• Alarm function ： The water level of the reservoir in each section is too low, and an audible and visual alarm is sent , Remind to add water .
• Host computer design ： The upper computer realizes the remote interaction and control with the information of each road section .

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  3  Design of the lower computer of the system

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  3.1  Hardware selection of lower computer

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  Serial number	modular	model
  1	Single chip microcomputer	CC2530 Single chip microcomputer
  2	Communication module	ZigBee
  3	Temperature sensor	DS18B20
  4	Water level sensor	——
  5	Buzzer	——
  6	PM2.5 sensor	GP2Y1010AU0F
  7	Water pump drive module	——
  8	Display module	OLED The screen

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  3.2  Physical display of lower machine

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  4  Host computer design  

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  5  Part of the source code of the lower computer

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  void APP_Config(void)
  {
    usart_config();// Serial port initialization configuration 
    timer_config();// Timer initialization configuration  
    gpio_config(); //IO Port initialization configuration 
  #if defined(ZDO_COORDINATOR) // The coordinator  
    key_config();  // Press the key to initialize the configuration 
    flash_config();
    flash_read(122,0,flash_temp,8);
    if(flash_temp[0]!=0xff){  
      min_wendu=flash_temp[0];
      max_wendu=flash_temp[1]; 
      min_shidu=flash_temp[2];
      max_shidu=flash_temp[3]; 
      mode_relay=flash_temp[4]; 
      max_pm25=flash_temp[5]; 
      max_pm25=max_pm25<<8;
      max_pm25=max_pm25+flash_temp[6];  
    }
    display_info_config();
  #else 
    HalAdcSetReference(HAL_ADC_REF_AVDD);
    P0DIR &= ~0x60;                 //P0.5 P0.6 Defined as input port 
  #endif  
    usart_sentstring("APP Initialization complete \r\n"); 
    printf("printf is ok\r\n");
  }
  void APP(unsigned char task)// The user polls the process 
  {
      #if defined(ZDO_COORDINATOR) // The coordinator    
    if(flag_beep==1){
      if(cnt_beep>2000){
          BEEP_ON;
          cnt_beep=0;
      }else{
        if(cnt_beep>100){
         BEEP_OFF;   
        }
      }
    }else{
    BEEP_OFF;
    }
     key_server();// Press the key to scan the process 
    App_Report();
     #endif
     switch(task)              // Task progress 
      {
         case 0:// Serial port process 
              if(rx_update)     // Serial command process , received \r\n Update order 
                {
                  rx_update=0;             // Clear the update flag bit 
                 printf("receive usart command:%s\r\n",rx_temp);// Print received data 
                  rtc_usart_time_set();    // Serial port settings RTC Time function 
                  usart_set_mode(); 
                  usart_set_relay();
                  usart_set_range();
                  usart_check_mode();
                  usart_check_relay();
                  usart_check_range();
                  flash_erase(122);// eliminate FLASH
                delayms(100);
                flash_temp[0]=min_wendu;
                flash_temp[1]=max_wendu;
                flash_temp[2]=min_shidu;
                flash_temp[3]=max_shidu;
                flash_temp[4]=mode_relay;             
                flash_temp[5]=max_pm25>>8;
                flash_temp[6]=max_pm25; 
                flash_write(122,0,flash_temp,8);
                    display_info_config();
                  wipe_buffer(rx_temp,50);// Clear the serial port cache data 
                  rx_index=0;             // Serial port cache pointer back 0
                  rx_flag=1;              // The serial port allows you to receive 
                   timer1cnt=0;
                }                      
         break;
        case 1:// Display the refresh process  
          if(keymode==0) { 
                #if defined(ZDO_COORDINATOR) // The coordinator 
                      { 
                         display_info();      // Temperature and humidity display            
                      }
                #else                        // Terminal or route   
                      {                    
                      }
                #endif 
                }
         break;
        case 2:// Switch the display process  
            if(keymode==0) {            
                   #if defined(ZDO_COORDINATOR) // The coordinator           
                      if(timer1cnt>1000) // Timer process 
                        {
                               rf_temp[0]='1';
                               rf_temp[1]='1';
                               rf_temp[2]='1';
                               rf_temp[3]='\r';
                               rf_temp[4]='\n';
                               rf_temp[5]=mode_relay+0x30;
                               rf_temp[6]=status_relay+0x30;
                               rf_temp[9]=0;
                                RF_ACK(rf_temp);
                         timer1cnt=0;
                        }
                   #else          
                       if(timer1cnt>800) // Timer process , Every time 3 Flip the display once every second 
                          {   
                           timer1cnt=0;
                          }    
                      task=0;                                     
                   #endif             
            }                         
        break;
        case 3:// Relay control process 
         #if defined(ZDO_COORDINATOR) // The coordinator     
         #endif     
              task=0;  
        break;
        case 4:
        break;
        case 5:
         break;
         default:
                task=0;
         break;
      }
  }
  void display_info(void)
  {
     unsigned char i;
     LCD_P8x16(40,0,&number[pm25/100]);
     LCD_P8x16(48,0,&number[pm25%100/10]);
     LCD_P8x16(56,0,&number[pm25%10]);    
     LCD_P8x16(40,2,&number[temperature/10]);
     LCD_P8x16(48,2,&number[temperature%10]);
     LCD_P8x16(40,4,&number[soil/10]);
     LCD_P8x16(48,4,&number[soil%10]);
   if(mode_relay==0){
     for(i=0;i<2;i++)
       LCD_P16x16Ch(16*i,6,22+i);// Automatically 
   }else{
      for(i=0;i<2;i++)
       LCD_P16x16Ch(16*i,6,24+i);// Manual 
   }
   if(status_relay==1){
    LCD_P16x16Ch(112,6,28);// open 
   }else{
   LCD_P16x16Ch(112,6,29);// Turn off 
   } 
               flag_beep=0;   
     if(mode_relay==0)  status_relay=0;// In automatic mode , Shut down first 
      if(temperature>max_wendu){
        if(mode_relay==0){ status_relay=1;}
        flag_beep=1;  
      }
     if(pm25>max_pm25 ){
        if(mode_relay==0){ status_relay=1;}
        flag_beep=1;  
    }
     if(soil<min_shidu){// There is no water at all , Call the police 
        flag_water=0;
        flag_beep=1;    
    }else{
      if(soil<max_shidu){// There's almost no water , Alarm, but it still works 
          flag_beep=1;
          flag_water=1;
      }
      else
      {
          if(soil>max_shidu){// Sufficient water 
            flag_water=2;
          }    
      }
    } 
    if(flag_water==0)// Water shortage , Regardless of the mode , Turn it off 
    {
      status_relay=0;
    }
  }