扫描环境中的Wifi信号

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1. /*
   
2. *  This sketch demonstrates how to scan WiFi networks.
   
3. *  The API is almost the same as with the WiFi Shield library,
   
4. *  the most obvious difference being the different file you need to include:
   
5. */
   
6. #include "ESP8266WiFi.h"
   
7. 
   
8. void setup() {
   
9.   Serial.begin(115200);
   
10. 
    
11.   // Set WiFi to station mode and disconnect from an AP if it was previously connected
    
12.   WiFi.mode(WIFI_STA);
    
13.   WiFi.disconnect();
    
14.   delay(100);
    
15. 
    
16.   Serial.println("Setup done");
    
17. }
    
18. 
    
19. void loop() {
    
20.   Serial.println("scan start");
    
21. 
    
22.   // WiFi.scanNetworks will return the number of networks found
    
23.   int n = WiFi.scanNetworks();
    
24.   Serial.println("scan done");
    
25.   if (n == 0)
    
26.     Serial.println("no networks found");
    
27.   else
    
28.   {
    
29.     Serial.print(n);
    
30.     Serial.println(" networks found");
    
31.     for (int i = 0; i < n; ++i)
    
32.     {
    
33.       // Print SSID and RSSI for each network found
    
34.       Serial.print(i + 1);
    
35.       Serial.print(": ");
    
36.       Serial.print(WiFi.SSID(i));
    
37.       Serial.print(" (");
    
38.       Serial.print(WiFi.RSSI(i));
    
39.       Serial.print(")");
    
40.       Serial.println((WiFi.encryptionType(i) == ENC_TYPE_NONE)?" ":"*");
    
41.       delay(10);
    
42.     }
    
43.   }
    
44.   Serial.println("");
    
45. 
    
46.   // Wait a bit before scanning again
    
47.   delay(5000);
    
48. }

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