Arduino IDE for ESP8266 项目（2）wifi扫描

#include "ESP8266WiFi.h"

void setup() {

  Serial.begin(115200);

 //设定WiFi为STA模式，如果先前已连接上AP，则与之断开

  WiFi.mode(WIFI_STA);

  WiFi.disconnect();

  delay(100);

  Serial.println("Setup done");

}

void loop() {

  Serial.println("scan start");

  // WiFi.scanNetworks可以返回扫描到的无线网络数目

  int n = WiFi.scanNetworks();

  Serial.println("scan done");

  if (n == 0)

    Serial.println("no networks found");

  else

  {

    Serial.print(n);

    Serial.println(" networks found");

    for (int i = 0; i < n; ++i)

    {

 /*在串口输出所发现的每一个无线网络的SSID和所接收的信号强度RSSI */

      Serial.print(i + 1);

      Serial.print(": ");

      Serial.print(WiFi.SSID(i));

      Serial.print(" (");

      Serial.print(WiFi.RSSI(i));

      Serial.print(")");

//判断WiFi网络是否加密，并输出结果     

      Serial.println((WiFi.encryptionType(i) == ENC_TYPE_NONE)?" ":"*");

      delay(10);

    }

  }

  Serial.println("");

 //连续扫描的时间间隔

  delay(5000);

}