🗺️ GPS Location Tracker

Parse live NMEA GPS sentences and serve your coordinates on a web map.

📋 Overview

The Neo-6M GPS module receives satellite signals and outputs NMEA 0183 sentences over a 9600 baud UART connection. This project parses the GPRMC/GPGGA sentences to extract latitude, longitude, altitude, speed, and fix quality — then serves them on an ESP32 web page with a live Google Maps embed.

What you'll learn: NMEA sentence parsing with the TinyGPS++ library, UART bridging, ESP32 AsyncWebServer, and embedding dynamic map coordinates into HTML templates.

Estimated time: 1.5–2.5 hours. Difficulty: ⭐⭐⭐ Intermediate.

🧩 Components Needed

Component	Specification	Qty	Notes
ESP32 Development Board	WiFi + Dual UART	1	Multiple hardware serial ports
Neo-6M GPS Module	9600 baud UART	1	With ceramic patch antenna
Active GPS Antenna	SMA connector	1	For indoor testing
Jumper Wires	Female-to-Female	4	VCC, GND, TX, RX

📖 Step-by-Step Tutorial

Wire the GPS Module

Connect Neo-6M VCC → 3.3V, GND → GND, TX → ESP32 GPIO 16 (RX2), RX → GPIO 17 (TX2). The GPS TX → ESP32 RX.

Install TinyGPS++

Install TinyGPS++ by Mikal Hart from the Library Manager. It parses all NMEA sentence types automatically.

Wait for GPS Fix

GPS modules take 30–90 seconds to acquire a satellite fix outdoors. During this time gps.location.isValid() returns false. Show a "Acquiring fix..." message.

Build the Web Server

Set up ESPAsyncWebServer. On GET "/", serve an HTML page that embeds the lat/lon into a Google Maps iframe URL for a live map pin.

Add OLED Display

Optionally wire an SSD1306 OLED to show lat, lon, altitude, speed, and satellite count without needing a phone or browser.

💡

The Neo-6M needs a clear view of the sky. Indoors, it may never get a fix. If testing indoors, use an active external antenna (connected via SMA) placed near a window for best results.

💻 Code / Configuration

gps_tracker.ino

INO

// GPS Location Tracker - Volt X
#include <TinyGPS++.h>
#include <WiFi.h>
#include <ESPAsyncWebServer.h>

const char* ssid     = "YOUR_WIFI_SSID";
const char* password = "YOUR_WIFI_PASSWORD";

TinyGPSPlus gps;
HardwareSerial gpsSerial(2); // UART2: GPIO16 (RX), GPIO17 (TX)
AsyncWebServer server(80);

double lat = 0, lon = 0, alt = 0, spd = 0;
int sats = 0;

void setup() {
  Serial.begin(115200);
  gpsSerial.begin(9600, SERIAL_8N1, 16, 17);

  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) delay(500);
  Serial.println("WiFi OK: " + WiFi.localIP().toString());

  server.on("/", HTTP_GET, [](AsyncWebServerRequest *req) {
    String html = "<!DOCTYPE html><html><head><title>GPS Tracker</title></head><body>";

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