# M5Stack GPS Module V2.1

> ATGM336H-based GPS/GNSS module supporting GPS, BeiDou, Galileo, GLONASS with external active antenna, DIP switch for TX/RX config, and PPS output.

## Quick Facts

- **Brand:** M5Stack
- **Board Type:** module
- **Price:** ~$21.9
- **Product Readiness:** consumer
- **CPU:** AT6668 GNSS SoC
- **CPU Architecture:** Embedded GNSS
- **RAM:** N/A
- **Flash:** N/A
- **Power:** 5V DC
- **Operating Voltage:** 3.3V
- **Dimensions:** 54.0 x 63.6 x 13.1 mm
- **Weight:** 16.0 g
- **Antenna:** SMA (external active antenna)

## Use Cases

- GPS Tracking
- Navigation
- Asset Tracking
- Time Synchronization
- Geofencing

## Components

- **ATGM336H** (GNSS Receiver): 50-channel GNSS receiver supporting GPS, BeiDou, Galileo, GLONASS, and QZSS with <1.5m accuracy and up to 10Hz update rate — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.icofchina.com%2Fd%2Ffile%2Fxiazai%2F2022-12-19%2FATGM336H-5N-7X%2520Specification.pdf&ref=openhardware.directory&product=m5stack-gps-module-v21&source=md-export)
- **External Active GPS Antenna** (Antenna): External active GPS antenna operating at 1555-1580MHz with 1m cable and SMA connector — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fshop.m5stack.com%2Fproducts%2Fgps-module-v2-1-with-antenna-atgm336h&ref=openhardware.directory&product=m5stack-gps-module-v21&source=md-export)
- **Super Capacitor** (Capacitor): 20000uF 3.3V super capacitor providing power backup for fast hot start (1 second) satellite acquisition — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fshop.m5stack.com%2Fproducts%2Fgps-module-v2-1-with-antenna-atgm336h&ref=openhardware.directory&product=m5stack-gps-module-v21&source=md-export)

## Protocols

- **UART**
- **NMEA0183**

## Description

## Overview

The M5Stack GPS Module V2.1 is a multi-constellation GNSS positioning module built around the AT6668 SoC (ATGM336H). It supports GPS, BeiDou (BD2/BD3), Galileo, GLONASS, and QZSS satellite systems with positioning accuracy better than 1.5m. Includes an external active GPS antenna.

## Key Features

- **AT6668 SoC** with 50-channel GNSS receiver
- Multi-constellation: GPS/QZSS/BD2/BD3/Galileo/GLONASS
- Positioning accuracy < 1.5m CEP50
- Up to 10Hz update rate
- Cold start: 23s, Hot start: 1s
- PPS (Pulse Per Second) signal output for time synchronization
- DIP switch for flexible TX/RX pin configuration
- Module stacking compatible with M5Stack system
- External active antenna included (1m cable)
- Super capacitor (20000uF) for fast hot start

## Specifications

| Parameter | Value |
|-----------|-------|
| SoC | AT6668 |
| Channels | 50 |
| GNSS Systems | GPS, BeiDou, Galileo, GLONASS, QZSS |
| Accuracy | < 1.5m CEP50 |
| Update Rate | Up to 10Hz |
| Cold Start | 23 seconds |
| Hot Start | 1 second |
| Tracking Sensitivity | -162 dBm |
| Protocol | NMEA0183 4.1 |
| Power (standby) | 29.43 uA @ 5V |
| Power (operating) | 28.35 mA @ 5V |
| Dimensions | 54.0 x 63.6 x 13.1 mm |
| Weight | 16.0 g |

## Where to Buy

- [OpenELAB](https://openhardware.directory/r?to=https%3A%2F%2Fopenelab.io%2Fproducts%2Fm5stack-gps-module-v2-1-atgm336h&ref=openhardware.directory&product=m5stack-gps-module-v21&source=md-export) — $21.90

## Resources

- [product](https://openhardware.directory/r?to=https%3A%2F%2Fopenelab.io%2Fproducts%2Fm5stack-gps-module-v2-1-atgm336h&ref=openhardware.directory&product=m5stack-gps-module-v21&source=md-export)

## Tags

`gps`, `gnss`, `navigation`, `location`, `m5stack`, `module`, `atgm336h`, `positioning`

## Images

![M5Stack GPS Module V2.1](https://nbg1.your-objectstorage.com/openhardware-directory/entities/m5stack-gps-module-v21/9f0c03279ef4.webp)

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