ESP8266 Wifi Scanner

This sketch demonstrates how to scan WiFi networks. ESP8266 is programmed in access point mode. All found WiFi networks will be printed in the serial monitor window (TTY).

#include "ESP8266WiFi.h"
 
void setup() {
  Serial.begin(115200);
 
  // Set WiFi to station mode and disconnect 
  // from an AP if it was previously connected
  WiFi.mode(WIFI_STA);
  WiFi.disconnect();
  delay(100);
 
  Serial.println("Setup done");
}
 
void loop() {
  Serial.println("scan start");
 
  // WiFi.scanNetworks will return the number of networks found
  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)
    {
      // Print SSID and RSSI for each network found
      Serial.print(i + 1);
      Serial.print(": ");
      Serial.print(WiFi.SSID(i));
      Serial.print(" (");
      Serial.print(WiFi.RSSI(i));
      Serial.print(")");
      Serial.println((WiFi.encryptionType(i) == ENC_TYPE_NONE)?" ":"*");
      delay(10);
    }
  }
  Serial.println("");
 
  // Wait a bit before scanning again
  delay(5000);
}