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ESP32 - GPS
In this guide, we'll discover how to extract GPS coordinates (longitude, latitude, altitude), GPS speed (in kilometers per hour), and date-time information from the NEO-6M GPS module. Additionally, we'll explore the process of calculating the distance between the current GPS position and a predefined set of GPS coordinates (such as the coordinates of London).
Hardware Used In This Tutorial
| 1 | × | ESP-WROOM-32 Dev Module | |
| 1 | × | Micro USB Cable | |
| 1 | × | NEO-6M GPS module | |
| 1 | × | Jumper Wires | |
| 1 | × | Breadboard | |
| 1 | × | (Optional) ESP32 Screw Terminal Adapter |
Or you can buy the following sensor kit:
| 1 | × | DIYables Sensor Kit 30 types, 69 units |
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Introduction to NEO-6M GPS module
Pinout
The NEO-6M GPS module has 4 pins:
- VCC pin: needs to be connected to VCC (5V)
- GND pin: needs to be connected to GND (0V)
- TX pin: is used for communication between the GPS module and ESP32, needs to be connect to Serial RX pin on ESP32.
- RX pin: is used for communication between the GPS module and ESP32, needs to be connect to Serial TX pin on ESP32.
Wiring Diagram
This image is created using Fritzing. Click to enlarge image
ESP32 Code
Reading GPS coordinates, speed (km/h), and date time
/*
* This ESP32 code is created by esp32io.com
*
* This ESP32 code is released in the public domain
*
* For more detail (instruction and wiring diagram), visit https://esp32io.com/tutorials/esp32-gps
*/
#include <TinyGPS++.h>
#define GPS_BAUDRATE 9600 // The default baudrate of NEO-6M is 9600
TinyGPSPlus gps; // the TinyGPS++ object
void setup() {
Serial.begin(9600);
Serial2.begin(GPS_BAUDRATE);
Serial.println(F("ESP32 - GPS module"));
}
void loop() {
if (Serial2.available() > 0) {
if (gps.encode(Serial2.read())) {
if (gps.location.isValid()) {
Serial.print(F("- latitude: "));
Serial.println(gps.location.lat());
Serial.print(F("- longitude: "));
Serial.println(gps.location.lng());
Serial.print(F("- altitude: "));
if (gps.altitude.isValid())
Serial.println(gps.altitude.meters());
else
Serial.println(F("INVALID"));
} else {
Serial.println(F("- location: INVALID"));
}
Serial.print(F("- speed: "));
if (gps.speed.isValid()) {
Serial.print(gps.speed.kmph());
Serial.println(F(" km/h"));
} else {
Serial.println(F("INVALID"));
}
Serial.print(F("- GPS date&time: "));
if (gps.date.isValid() && gps.time.isValid()) {
Serial.print(gps.date.year());
Serial.print(F("-"));
Serial.print(gps.date.month());
Serial.print(F("-"));
Serial.print(gps.date.day());
Serial.print(F(" "));
Serial.print(gps.time.hour());
Serial.print(F(":"));
Serial.print(gps.time.minute());
Serial.print(F(":"));
Serial.println(gps.time.second());
} else {
Serial.println(F("INVALID"));
}
Serial.println();
}
}
if (millis() > 5000 && gps.charsProcessed() < 10)
Serial.println(F("No GPS data received: check wiring"));
}
Quick Instructions
- If this is the first time you use ESP32, see how to setup environment for ESP32 on Arduino IDE.
- Do the wiring as above image.
- Connect the ESP32 board to your PC via a micro USB cable
- Open Arduino IDE on your PC.
- Select the right ESP32 board (e.g. ESP32 Dev Module) and COM port.
- On Arduino IDE, Go to Manage Libraries in the left bar
- Search “TinyGPSPlus”, then find the TinyGPSPlus library by Mikal Hart
- Click Install button to install TinyGPSPlus library.
- Copy the above code and open with Arduino IDE
- Click Upload button on Arduino IDE to upload code to ESP32
- See the result on Serial Monitor:
COM6
Autoscroll
Clear output
9600 baud
Newline
Calculating the distance from current location to a predefined location
The below code calculates the distance between the current location and London (lat:51.508131 , long: -0.128002)
/*
* This ESP32 code is created by esp32io.com
*
* This ESP32 code is released in the public domain
*
* For more detail (instruction and wiring diagram), visit https://esp32io.com/tutorials/esp32-gps
*/
#include <TinyGPS++.h>
#define GPS_BAUDRATE 9600 // The default baudrate of NEO-6M is 9600
TinyGPSPlus gps; // the TinyGPS++ object
const double LONDON_LAT = 51.508131;
const double LONDON_LON = -0.128002;
void setup() {
Serial.begin(9600);
Serial2.begin(GPS_BAUDRATE);
Serial.println(F("ESP32 - GPS module"));
}
void loop() {
if (Serial2.available() > 0) {
if (gps.encode(Serial2.read())) {
if (gps.location.isValid()) {
double latitude = gps.location.lat();
double longitude = gps.location.lng();
unsigned long distanceKm = TinyGPSPlus::distanceBetween(latitude, longitude, LONDON_LAT, LONDON_LON) / 1000;
Serial.print(F("- latitude: "));
Serial.println(latitude);
Serial.print(F("- longitude: "));
Serial.println(longitude);
Serial.print(F("- distance to London: "));
Serial.println(distanceKm);
} else {
Serial.println(F("- location: INVALID"));
}
Serial.println();
}
}
if (millis() > 5000 && gps.charsProcessed() < 10)
Serial.println(F("No GPS data received: check wiring"));
}
Quick Instructions
- Copy the above code and open with Arduino IDE
- Click Upload button on Arduino IDE to upload code to ESP32
- See the result on Serial Monitor:
COM6
Autoscroll
Clear output
9600 baud
Newline
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