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
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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, 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, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 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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, 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, 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) { 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(); } |