19Dec
ESP32 with AI Thinker GP-02 GPS Module
✅ What is AI Thinker GP-02?
The AI Thinker GP-02 is a GNSS (GPS) module, designed to work with satellite navigation systems to provide:
- Real-time location data (latitude, longitude)
- Speed
- Altitude
- Time (UTC)
- and more
It supports multiple satellite constellations:
- GPS (USA)
- GLONASS (Russia)
- Galileo (EU)
- BeiDou (China)
It communicates using UART (Serial) and is ideal for ESP32, Arduino, STM32, etc.
🧩 Features of GP-02 (AI Thinker GNSS Module):
| Feature | Detail |
|---|---|
| Communication | UART (TX/RX) |
| Protocol | NMEA0183 |
| Baud Rate | 9600 bps (default) |
| Voltage | 3.3V logic and power |
| Satellite support | GPS, GLONASS, BDS, Galileo |
| Accuracy | ~2.5m |
| Update Rate | 1Hz (default), can be increased |
📌 Pinout of AI Thinker GP-02:
| GP-02 Pin | Function |
|---|---|
| VCC | 3.3V |
| GND | Ground |
| TX | Serial TX (data from GPS to ESP32) |
| RX | Serial RX (data from ESP32 to GPS) |
🧠 Note: You only need TX → RX and VCC/GND for location data reading.
🔌 Connecting GP-02 to ESP32
Use SoftwareSerial alternative like HardwareSerial in ESP32:
| GP-02 | ESP32 |
|---|---|
| VCC | 3.3V |
| GND | GND |
| TX | GPIO 16 (RX of ESP32) |
| RX | GPIO 17 (TX of ESP32) |
You can use any available hardware UART (ESP32 has 3 UARTs: Serial0, Serial1, Serial2)
📄 Arduino Code Example for ESP32 + GP-02
We’ll use the TinyGPSPlus library to parse GPS data:
🛠️ Step 1: Install Library
Go to Arduino IDE:
- Sketch > Include Library > Manage Libraries
- Install TinyGPSPlus
📌 Use Cases for GP-02
| Project | Description |
|---|---|
| 📍 GPS Tracker | Real-time location tracking via GSM/LoRa/WiFi |
| 🚴 Bike Speedometer | Get speed, distance, and log path |
| 🛰️ IoT Location Logger | Store location logs in SD card or send to server |
| 🚗 Geo-fencing | Trigger actions based on location boundaries |
| 🧭 Navigation Device | Portable handheld GPS tool with OLED display |
🧠 Pro Tips
- Must be outdoors or near a window for best signal.
- Cold start may take 30–60 seconds for the first lock.
- Use a small GPS patch antenna for better reception if available.
HOW TO OPERATE
#include <TinyGPS++.h>
#include <HardwareSerial.h>
TinyGPSPlus gps;
HardwareSerial GPS(1); // UART1
#define RXD2 16 // Connect to GP-02 TX
#define TXD2 17 // Connect to GP-02 RX
void setup() {
Serial.begin(115200); // Debug Serial Monitor
GPS.begin(9600, SERIAL_8N1, RXD2, TXD2); // Start GPS UART
Serial.println("GP-02 GPS Location to Google Maps");
}
void loop() {
while (GPS.available()) {
gps.encode(GPS.read());
if (gps.location.isUpdated()) {
float lat = gps.location.lat();
float lon = gps.location.lng();
Serial.println("Location Updated:");
Serial.print("Latitude: "); Serial.println(lat, 6);
Serial.print("Longitude: "); Serial.println(lon, 6);
// Google Maps URL
Serial.print("Google Maps: ");
Serial.print("https://www.google.com/maps/place/");
Serial.print(lat, 6);
Serial.print(",");
Serial.println(lon, 6);
Serial.println("-----------------------------");
delay(5000); // Wait before printing next update
}
}
Serial.println("INVALID LOCATION");
}
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