Wi-Fi GPS Tracker with XIAO ESP32-S3, Geofencing & Alerts

Breadboard, White

Arduino® Nano ESP32

Arduino IDE

<html><body><h3><strong>Introduction</strong></h3><p>In this project, you’ll build an affordable, real-time GPS Tracker with Seeed Studio XIAO ESP32-S3 and the Neo-6M GPS module — no SIM card or cellular hardware required. By sending GPS coordinates via Wi-Fi to a free online service called GeoLinker, you can visualise the device’s location on a map, log movement history, and trigger geofence-based SMS alerts when your tracker leaves a defined area. </p><p>This tracker is ideal for vehicle tracking, asset protection, pet monitoring, and other location-based IoT applications where simplicity and low cost matter.</p><p></p><figure><img src="https://projects.arduinocontent.cc/2ec73710-46f7-48f2-a359-aa356bb99340.png"/><figcaption></figcaption></figure><p></p><h3><strong>Why This GPS Tracker?</strong></h3><p>Most traditional GPS trackers rely on cellular modules to upload location data, increasing cost and complexity. In contrast, this Wi-Fi-enabled tracker:</p><ol><li>Avoids cellular service plans, using Wi-Fi instead. </li><li>Visualises movement on an interactive map via the GeoLinker service. </li><li>Triggers SMS alerts when a geofence boundary is crossed. </li><li>Caches GPS data offline if Wi-Fi goes down and syncs later. </li><li>Uses open standards and Arduino libraries, making it easy to customize. </li></ol><p></p><p></p><figure><img src="https://projects.arduinocontent.cc/3731bd5e-bd82-461b-a39a-8bf1cc299cee.jpg"/><figcaption></figcaption></figure><p></p><h3><strong>How It Works</strong></h3><p><strong>GPS Signal Acquisition:</strong> The Neo-6M GPS module receives satellite signals and calculates latitude and longitude. </p><p><strong>Microcontroller Processing: </strong>The XIAO ESP32-S3 reads the GPS data over a serial interface (UART). </p><p><strong>Wi-Fi Upload:</strong> Coordinates are uploaded to the GeoLinker cloud service at regular intervals. </p><p><strong>Map Visualization: </strong>GeoLinker plots your device’s location in real time and stores a history trail. </p><p><strong>Geofence Monitoring: </strong>The tracker computes the distance from a home coordinate using the Haversine formula. </p><p><strong>SMS Alerts:</strong> If the tracker exits a pre-defined radius (e.g., 50 m), an SMS notification with current coordinates is sent. </p><p><strong>Offline Storage:</strong> Location points are temporarily cached when Wi-Fi is unavailable and uploaded once it reconnects.</p><p></p><figure><img src="https://projects.arduinocontent.cc/cb1e0b31-e179-49e1-ba0f-ce7527d023dd.jpg"/><figcaption></figcaption></figure><h3><strong>GeoLinker Setup &amp; API</strong></h3><p>To visualize your GPS tracker and enable SMS notifications:</p><ol><li>Create an account on the GeoLinker platform.</li><li>Generate an API key. </li><li>Link your mobile number to allow SMS alerts. </li><li>Use the API key and device ID in your Arduino sketch to authenticate and send updates. </li><li>GeoLinker also offers a free tier with up to 10,000 data points and 100 SMS API calls. </li></ol><h3><strong>Key Code Concepts</strong></h3><p>Your firmware will:</p><ol><li>Initialize Wi-Fi and connect to GeoLinker. </li><li>Read GPS data via serial and parse it. </li><li>Upload periodic location updates. </li><li>Calculate distance from a home coordinate using the Haversine formula. </li><li>Trigger SMS via the GeoLinker Cloud SMS API when crossing the geofence boundary. </li></ol><p>You can adjust parameters like update frequency, geofence radius, and even add multiple geofences, speed alerts, or battery monitoring. </p><h3><strong>Demonstration &amp; Testing</strong></h3><p>Power your tracker (e.g., via USB or battery). Connect to Wi-Fi (phone hotspot works). The GeoLinker dashboard will start plotting your path in real time. If the device leaves the defined geofence, an SMS with its coordinates is sent instantly. </p><h3><strong>Real-World Uses</strong></h3><p>This <a href="https://circuitdigest.com/microcontroller-projects/gps-tracker-with-seeed-studio-xiao-esp32-s3-and-geofencing">GPS Tracker with Seeed Studio XIAO ESP32-S3 project </a>makes a solid foundation for many real applications:</p><p>Fleet and Vehicle Tracking</p><p>Asset Monitoring and Security</p><p>Child and Elderly Safety Alerts</p><p>Pet Location Tracking</p><p>Its low cost and flexibility make it perfect for learning and expanding into advanced IoT systems. </p><h3><strong>Conclusion</strong></h3><p>You’ve now got a robust Wi-Fi GPS tracker that doesn’t rely on cellular service, offers geofencing with alerts, and logs movement to the cloud. Whether you’re building a fleet tracker or a personal locator, this project is a scalable base that showcases how cloud services like GeoLinker can empower IoT development with minimal hardware overhead</p><p></p><figure><iframe src="https://youtu.be/zWzFSjA70-k"></iframe></figure><p></p></body></html>

Wi-Fi GPS Tracker with XIAO ESP32-S3, Geofencing & Alerts

Build a smart Wi-Fi GPS tracker using the Seeed Studio XIAO ESP32-S3 and Neo-6M with cloud mapping, customizable geofencing, and SMS alert notifications.