diff --git a/applications/PM2.5.C b/applications/PM2.5.C
deleted file mode 100644
index 8272962..0000000
--- a/applications/PM2.5.C
+++ /dev/null
@@ -1,57 +0,0 @@
-
-// #include <rtthread.h>
-// #include <rtdevice.h>
-// #include "math.h"
-// #include <board.h>
-// #include <drv_gpio.h>
-// #ifndef RT_USING_NANO
-// #endif /* RT_USING_NANO */
-// #define PM25_READ_TIMES	20
-// #define GPIO_PIN    GET_PIN(G, 5)
-// extern   float ADC_Read();
-// extern   float ADC1_Read();
-// float PM25_GetData(void)
-// {
-// 	int ADCVal;
-// 	int dustVal = 0;
-// 	float Voltage;
- 
-//     rt_pin_write(GPIO_PIN, PIN_HIGH);//置1  开启内部LED
-   
-// 	rt_hw_us_delay(280);
-// 	ADCVal =  ADC1_Read();
-// 	rt_hw_us_delay(25);			  
-//     rt_pin_write(GPIO_PIN, PIN_LOW);	//置0  关闭内部LED
-// 	rt_hw_us_delay(9680);			//需要脉宽比0.32ms/10ms的PWM信号驱动传感器中的LED
-	
-// 	Voltage = 3.3f * ADCVal / 4096.f * 2; //获得AO输出口的电压值
-	
-// 	dustVal = (0.17*Voltage-0.1)*1000;  //乘以1000单位换成ug/m3//
-
-// 	if (dustVal < 0)
-// 		dustVal = 0;            //限位//
-
-// 	if (dustVal>500)        
-// 		dustVal=500;
-
-// 	return dustVal;
-// }
-
-// /**
-//   * @brief  平均值滤波法
-//   * @param  无
-//   * @retval 返回滤波后的数据
-//   */
-// float Get_PM25_Average_Data(void)
-// {
-// 	float temp_val=0;
-// 	float t;
-// 	for(t=0;t<PM25_READ_TIMES;t++)	//#define PM25_READ_TIMES	20	定义读取次数,读这么多次,然后取平均值
- 
-// 	{
-// 		temp_val+=PM25_GetData();	//读取ADC值
-// 		rt_thread_mdelay(5);
-// 	}
-// 	temp_val/=PM25_READ_TIMES;//得到平均值
-//     return temp_val;//返回算出的ADC平均值
-// }
\ No newline at end of file
diff --git a/applications/myproject.c b/applications/myproject.c
index 81ae4ba..81a051e 100644
--- a/applications/myproject.c
+++ b/applications/myproject.c
@@ -439,11 +439,12 @@ void wlan_connect_thread(void *parameter)
     wlan_connected=RT_FALSE;
     while (1)
     {
-        if (rt_wlan_is_connected() != RT_TRUE)
+        if (rt_wlan_is_connected() == RT_TRUE)
         {
             if(!wlan_connected)
             {
                 wlan_connected = RT_TRUE;
+                rt_thread_mdelay(2000);
                 mqt_init();
             }
         }
@@ -456,7 +457,7 @@ void wlan_connect_thread(void *parameter)
                 rt_thread_delete(MQTT_Thread);
             }
         }    
-        rt_thread_mdelay(2000);
+        rt_thread_mdelay(500);
     }
 }
 // /* 用于接收消息的信号量 */