Wifi Locator

So I’ve been playing around with a NodeMCU (ESP8266) and I’m having a lot of fun. I created a program to find all wireless networks and display them on a tiny 128×64 OLED screen. It lists the top 6 networks in order by strength. As you walk around you can locate where the AP’s are.

Everything is on my Git: https://github.com/l3gsh0t/WifiLocator

/*********************************************************************
Author: Matthew Waddell
Use: ESP SSID Fun
*********************************************************************/

#include <Adafruit_SSD1306.h>
#include <ESP8266WiFi.h>

//Settings
#define OLED_RESET LED_BUILTIN //4
Adafruit_SSD1306 display(OLED_RESET);
const int led = 13;

//check if screen is set correctly
#if (SSD1306_LCDHEIGHT != 64)
#error("Height incorrect, please fix Adafruit_SSD1306.h!");
#endif

const unsigned char PROGMEM logo [] = {
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};

void printEncryptionType(int thisType) {
  // read the encryption type and print out the name:
  switch (thisType) {
    case ENC_TYPE_WEP:
      Serial.println("WEP");
      break;
    case ENC_TYPE_TKIP:
      Serial.println("WPA");
      break;
    case ENC_TYPE_CCMP:
      Serial.println("WPA2");
      break;
    case ENC_TYPE_NONE:
      Serial.println("None");
      break;
    case ENC_TYPE_AUTO:
      Serial.println("Auto");
      break;
  }
}

void displayNetwork(int line, String ssid, int rssi){
  if (ssid.length() < 1) { ssid = "<hidden>"; }
  display.setCursor(0,8*line);
  display.print(ssid.substring(0,16));
  display.setCursor(105,8*line);
  display.println(rssi);
}

void listNetworks() {
  // scan for nearby networks:
  Serial.println("\n** Scan Networks **");
  int numSsid = WiFi.scanNetworks(false, true);
  if (numSsid == -1) {
    Serial.println("Couldn't get a wifi connection");
    while (true);
  }

  // print the list of networks seen:
  Serial.print("Number of available networks: ");
  Serial.println(numSsid);

  // print the network number and name for each network found:
 for (int thisNet = 0; thisNet < numSsid; thisNet++) {
    String ssid = WiFi.SSID(thisNet);
    if (ssid.length() < 1) { ssid = "<hidden>"; }
    Serial.print(int(thisNet + 1) + String(") ") + ssid + String("\tSignal: ") + WiFi.RSSI(thisNet) + String(" dBm\tEncryption: "));
    printEncryptionType(WiFi.encryptionType(thisNet));
  }

  // get top 6 network signals
  int firstpos = -1, secondpos = -1, thirdpos = -1, fourthpos = -1, fifthpos = -1, sixthpos = -1;

  if (numSsid > 0) {
    for (int i=0; i<numSsid; i++) {
      if (firstpos == -1 || WiFi.RSSI(firstpos) < WiFi.RSSI(i)) {
        firstpos = i;
      }
    }
  }
  
  if (numSsid > 1) {
    for (int i=0; i<numSsid; i++) {
      if (i != firstpos) {
        if (secondpos == -1 || WiFi.RSSI(secondpos) < WiFi.RSSI(i)) {
          secondpos = i;
        }
      }
    }
  }

  if (numSsid > 2) {
    for (int i=0; i<numSsid; i++) {
      if (i != firstpos && i != secondpos) {
        if (thirdpos == -1 || WiFi.RSSI(thirdpos) < WiFi.RSSI(i)) {
          thirdpos = i;
        }
      }
    }
  }

  if (numSsid > 3) {
    for (int i=0; i<numSsid; i++) {
      if (i != firstpos && i != secondpos && i != thirdpos) {
        if (fourthpos == -1 || WiFi.RSSI(fourthpos) < WiFi.RSSI(i)) {
          fourthpos = i;
        }
      }
    }
  }

  if (numSsid > 4) {
    for (int i=0; i<numSsid; i++) {
      if (i != firstpos && i != secondpos && i != thirdpos && i != fourthpos) {
        if (fifthpos == -1 || WiFi.RSSI(fifthpos) < WiFi.RSSI(i)) {
          fifthpos = i;
        }
      }
    }
  }

  if (numSsid > 5) {
    for (int i=0; i<numSsid; i++) {
      if (i != firstpos && i != secondpos && i != thirdpos && i != fourthpos && i != fifthpos) {
        if (sixthpos == -1 || WiFi.RSSI(sixthpos) < WiFi.RSSI(i)) {
          sixthpos = i;
        }
      }
    }
  }

  display.clearDisplay(); 
  display.setCursor(0,0);
  display.println(String("Networks: ") + numSsid);

  if (numSsid > 0) { displayNetwork(2, WiFi.SSID(firstpos), WiFi.RSSI(firstpos)); }
  if (numSsid > 1) { displayNetwork(3, WiFi.SSID(secondpos), WiFi.RSSI(secondpos)); }
  if (numSsid > 2) { displayNetwork(4, WiFi.SSID(thirdpos), WiFi.RSSI(thirdpos)); }
  if (numSsid > 3) { displayNetwork(5, WiFi.SSID(fourthpos), WiFi.RSSI(fourthpos)); }
  if (numSsid > 4) { displayNetwork(6, WiFi.SSID(fifthpos), WiFi.RSSI(fifthpos)); }
  if (numSsid > 5) { displayNetwork(7, WiFi.SSID(sixthpos), WiFi.RSSI(sixthpos)); }
  
  display.display();
}

void setup(void)   {                
  pinMode(led, OUTPUT);
  digitalWrite(led, 0);
  Serial.begin(9600);

  // Initialize screen
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.clearDisplay();
  display.setCursor(30,0);
  display.println("Wifi Locator");
  display.drawBitmap(0, 8,  logo, 128, 64, WHITE);
  display.display();
  delay(1000);
}

void loop() {
  listNetworks();
}

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/*********************************************************************

Author: Matthew Waddell

Use: ESP SSID Fun

*********************************************************************/

#include <Adafruit_SSD1306.h>

#include <ESP8266WiFi.h>

//Settings

#define OLED_RESET LED_BUILTIN //4

Adafruit_SSD1306 display(OLED_RESET);

const int led = 13;

//check if screen is set correctly

#if (SSD1306_LCDHEIGHT != 64)

#error("Height incorrect, please fix Adafruit_SSD1306.h!");

#endif

const unsigned char PROGMEM logo [] = {

0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3F, 0xFF, 0xFF, 0xFF, 0xE0, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0xFE, 0x01, 0xFC, 0x00, 0x70, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x00, 0x1F, 0x1F, 0xF0, 0x00, 0x80, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x00, 0x70, 0x00, 0x03, 0xF8, 0x20, 0x0C, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x01, 0xC4, 0x3F, 0xE0, 0x01, 0x88, 0x0C, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x18, 0x24, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x06, 0x01, 0x9C, 0x00, 0x00, 0xC9, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x04, 0x04, 0x00, 0x00, 0x00, 0x14, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x04, 0x00, 0x04, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x80, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x0C, 0x00, 0x02, 0x00, 0x3F, 0xE0, 0x01, 0x80, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x18, 0x03, 0xE0, 0x01, 0xEF, 0xF0, 0x00, 0xC0, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x38, 0x07, 0xF8, 0x03, 0x87, 0xC8, 0x00, 0x60, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x73, 0x0F, 0xFE, 0x03, 0x3F, 0xFC, 0x80, 0xB0, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x68, 0x00, 0x7F, 0x83, 0xF0, 0x08, 0x18, 0x28, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0xD4, 0x00, 0x06, 0x01, 0x81, 0x00, 0xFF, 0x14, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0xA9, 0xE0, 0x02, 0x00, 0x01, 0xC3, 0xC1, 0x86, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x83, 0xF9, 0x02, 0x00, 0x00, 0x7F, 0x90, 0xC2, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x80, 0x1F, 0x06, 0x00, 0x00, 0x00, 0x10, 0x43, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x80, 0x48, 0x0C, 0x01, 0x80, 0x00, 0x78, 0x43, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x88, 0x40, 0x38, 0x03, 0xC0, 0x03, 0xCE, 0x43, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x64, 0xC0, 0x70, 0x00, 0x60, 0x0F, 0x1F, 0x43, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x50, 0xC1, 0x78, 0x1E, 0x60, 0x7C, 0x18, 0xC2, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x25, 0xE0, 0x0C, 0x00, 0xC1, 0xF8, 0x38, 0x96, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x31, 0xF8, 0x07, 0x80, 0x0F, 0x08, 0x70, 0x24, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x11, 0xDE, 0x03, 0x00, 0x78, 0x0F, 0xE0, 0x1C, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x11, 0xD7, 0xE0, 0x1F, 0xF0, 0x3E, 0x60, 0x30, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x19, 0xD1, 0xFF, 0xF8, 0x10, 0xFC, 0xC0, 0x20, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x19, 0xD3, 0x04, 0x10, 0x1F, 0xF8, 0x80, 0x60, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x19, 0xF3, 0x04, 0x10, 0x3F, 0x89, 0x80, 0xC0, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x19, 0xFF, 0xFF, 0xFF, 0xFE, 0x0F, 0x00, 0x80, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x19, 0xFF, 0xFF, 0xFF, 0xF8, 0x06, 0x01, 0x80, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x19, 0xFF, 0xFF, 0xFF, 0x88, 0x1C, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x19, 0xFF, 0xFF, 0xF8, 0x0C, 0x38, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x10, 0xBD, 0xCE, 0x08, 0x04, 0xF0, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x10, 0xF6, 0xC6, 0x08, 0x07, 0xC0, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x10, 0x66, 0x62, 0x08, 0x0F, 0x00, 0x1C, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x10, 0x3F, 0x62, 0x08, 0x7C, 0x23, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x30, 0x1F, 0xFF, 0xFF, 0xE0, 0x8C, 0xE0, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x30, 0x00, 0x7F, 0xF0, 0x02, 0x33, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x30, 0x20, 0x00, 0x00, 0x08, 0x87, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x30, 0x10, 0x00, 0x00, 0x66, 0x3C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x31, 0x06, 0x00, 0x06, 0x20, 0xF0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x30, 0xC0, 0x00, 0x01, 0x03, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x30, 0x38, 0x00, 0x80, 0x0F, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x30, 0x00, 0x00, 0x00, 0x1C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00, 0x70, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x0C, 0x00, 0x00, 0x3F, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x06, 0x00, 0x01, 0xFE, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x03, 0xFF, 0xFF, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x00, 0x7F, 0xF0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00

};

void printEncryptionType(int thisType) {

// read the encryption type and print out the name:

switch (thisType) {

case ENC_TYPE_WEP:

Serial.println("WEP");

break;

case ENC_TYPE_TKIP:

Serial.println("WPA");

break;

case ENC_TYPE_CCMP:

Serial.println("WPA2");

break;

case ENC_TYPE_NONE:

Serial.println("None");

break;

case ENC_TYPE_AUTO:

Serial.println("Auto");

break;

}

void displayNetwork(int line, String ssid, int rssi){

if (ssid.length() < 1) { ssid = "<hidden>"; }

display.setCursor(0,8*line);

display.print(ssid.substring(0,16));

display.setCursor(105,8*line);

display.println(rssi);

}

void listNetworks() {

// scan for nearby networks:

Serial.println("\n** Scan Networks **");

int numSsid = WiFi.scanNetworks(false, true);

if (numSsid == -1) {

Serial.println("Couldn't get a wifi connection");

while (true);

}

// print the list of networks seen:

Serial.print("Number of available networks: ");

Serial.println(numSsid);

// print the network number and name for each network found:

for (int thisNet = 0; thisNet < numSsid; thisNet++) {

String ssid = WiFi.SSID(thisNet);

if (ssid.length() < 1) { ssid = "<hidden>"; }

Serial.print(int(thisNet + 1) + String(") ") + ssid + String("\tSignal: ") + WiFi.RSSI(thisNet) + String(" dBm\tEncryption: "));

printEncryptionType(WiFi.encryptionType(thisNet));

}

// get top 6 network signals

int firstpos = -1, secondpos = -1, thirdpos = -1, fourthpos = -1, fifthpos = -1, sixthpos = -1;

if (numSsid > 0) {