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ESP32 with NEO-8M GPS Module

15-07-2025

📡 What is the NEO-8M GPS Module?

The NEO-8M is a high-precision GNSS GPS receiver by u-blox, capable of receiving data from:

GPS (USA)
GLONASS (Russia)
Galileo (EU)
BeiDou (China)

It outputs serial (UART) data in NMEA sentences, giving real-time:

Latitude
Longitude
Altitude
Speed
Time & Date
Number of satellites
Fix quality

🧰 Components Required:

ESP32 (DevKit v1)
NEO-8M GPS Module (with or without ceramic antenna)
Jumper wires
Optional: OLED display or SD card module

⚙️ NEO-8M GPS Module Pinout:

GPS Pin	Function	Connect to ESP32
VCC	3.3V / 5V	3.3V or 5V (check module specs)
GND	Ground	GND
TX	Transmit (output)	GPIO16 (RX)
RX	Receive (input)	GPIO17 (TX)

📌 Use SoftwareSerial if you want to keep default Serial for debugging.

🛠️ Wiring Diagram:

💻 ESP32 Code (Using TinyGPSPlus Library)

1. ✅ Install Libraries:

Go to Arduino IDE:

Library Manager → Install TinyGPSPlus by Mikal Hart

🧠 How It Works:

The NEO-8M listens to satellite signals.
It calculates the location and time using trilateration.
Sends data to ESP32 as NMEA sentences like $GPRMC, $GPGGA, etc.
TinyGPSPlus parses this and gives readable info.

🛰️ Real-world Applications:

Live Location Tracker
GPS Logger to SD Card
IoT Asset Tracking
Vehicle Tracking System
Geofencing
Outdoor Robotics / Drones

⚠️ Important Notes:

Cold start may take 15–60 seconds to get a GPS fix.
Use ceramic patch antenna or GPS module with active antenna for better signal.
Needs clear sky view for fast location lock.
Avoid indoor testing—it may not get GPS fix.

HOW TO OPERATE

#include <TinyGPSPlus.h>

// Define the RX and TX pins for Serial 2

#define RXD2 16

#define TXD2 17

#define GPS_BAUD 9600

TinyGPSPlus gps;

// Create an instance of the HardwareSerial class for Serial 2

HardwareSerial ss(2);

void setup()

{

Serial.begin(115200);

//ss.begin(GPS_BAUD);

ss.begin(GPS_BAUD, SERIAL_8N1, RXD2, TXD2);

Serial.println(F("DeviceExample.ino"));

Serial.println(F("A simple demonstration of TinyGPSPlus with an attached GPS module"));

Serial.print(F("Testing TinyGPSPlus library v. ")); Serial.println(TinyGPSPlus::libraryVersion());

Serial.println(F("by Mikal Hart"));

Serial.println();

}

void loop()

{

// This sketch displays information every time a new sentence is correctly encoded.

while (ss.available() > 0)

if (gps.encode(ss.read()))

displayInfo();

if (millis() > 5000 && gps.charsProcessed() < 10)

{

Serial.println(F("No GPS detected: check wiring."));

while(true);

}

void displayInfo()

{

Serial.print(F("Location: "));

if (gps.location.isValid())

{

Serial.print(gps.location.lat(), 6);

Serial.print(F(","));

Serial.print(gps.location.lng(), 6);

}

else

{

Serial.print(F("INVALID"));

}

Serial.print(F(" Date/Time: "));

if (gps.date.isValid())

{

Serial.print(gps.date.month());

Serial.print(F("/"));

Serial.print(gps.date.day());

Serial.print(F("/"));

Serial.print(gps.date.year());

}

else

{

Serial.print(F("INVALID"));

}

Serial.print(F(" "));

if (gps.time.isValid())

{

if (gps.time.hour() < 10) Serial.print(F("0"));

Serial.print(gps.time.hour());

Serial.print(F(":"));

if (gps.time.minute() < 10) Serial.print(F("0"));

Serial.print(gps.time.minute());

Serial.print(F(":"));

if (gps.time.second() < 10) Serial.print(F("0"));

Serial.print(gps.time.second());

Serial.print(F("."));

if (gps.time.centisecond() < 10) Serial.print(F("0"));

Serial.print(gps.time.centisecond());

}

else

{

Serial.print(F("INVALID"));

}

Serial.println();

}

ESP32 with NEO-8M GPS Module

📡 What is the NEO-8M GPS Module?

🧰 Components Required:

⚙️ NEO-8M GPS Module Pinout:

🛠️ Wiring Diagram:

💻 ESP32 Code (Using TinyGPSPlus Library)

1. ✅ Install Libraries:

🧠 How It Works:

🛰️ Real-world Applications:

⚠️ Important Notes:

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Blog Details

ESP32 with NEO-8M GPS Module

📡 What is the NEO-8M GPS Module?

🧰 Components Required:

⚙️ NEO-8M GPS Module Pinout:

🛠️ Wiring Diagram:

💻 ESP32 Code (Using TinyGPSPlus Library)

1. ✅ Install Libraries:

🧠 How It Works:

🛰️ Real-world Applications:

⚠️ Important Notes:

Related Post