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Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex

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'''Documentation notice:''' This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

== Summary ==
Technical guide for the Waveshare NEO-M8T GNSS Timing HAT: GNSS and RTK principles, Raspberry Pi hardware connections, enabling the UART interface, library installation, Python examples, and building an NTP server with PPS.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL18294 WSAL18294 – NEO-M8T GNSS TIMING HAT for Raspberry Pi, Single-Satellite Timing, Concurrent Reception of GPS, Beidou, Galileo, GLONASS]

== Technical overview ==
* GNSS covers multiple satellite navigation systems (GPS, Beidou/BDS, Galileo, GLONASS, QZSS, IRNSS). The NEO-M8T receives these constellations concurrently, increasing the number of available satellites and improving positioning.
* RTK (Real Time Kinematic) is a differential carrier-phase measurement between a base station and a mobile receiver, enabling centimeter-level real-time positioning.
* Raspberry Pi hardware connections: 5V/GND for power; RXD to BCM pin 14 / WiringPi 15; TXD to BCM pin 15 / WiringPi 16; SDA to pin 2 / 8; SCL to pin 3 / 9; PPS to pin 18 / 1; INT (wakeup, low-active) to pin 27 / 2.
* To enable the serial interface on the Raspberry Pi, use raspi-config: Interfacing Options -> Serial -> No -> Yes, then reboot.
* Install gpsd, gpsd-clients and the Python package gps3 for data processing; configure /etc/default/gpsd with USBAUTO=false, DEVICES=/dev/ttyS0 and GPSD_OPTIONS=/dev/ttyUSB0.
* Demo codes can be downloaded and extracted; run main.py from ~/Documents/MAX-XXX_GNSS_HAT_Code/RaspberryPi/python/coordinate_converter to convert coordinates and display them on Google Maps.
* An NTP server can be built using the RPi-GPS-PPS-StratumOne project: git clone, run install-gps-pps.sh, modify /boot/config.txt (gpiopin=18), and verify with chronyc sourcestats.
* The PPS input must be set to GPIO 18 so that the Raspberry Pi adopts the NEO-M8T time and can provide it to other devices on the WLAN network.

'''Commands and examples – verify before use:'''
<syntaxhighlight lang="text">
sudo raspi-config
#Choose Interfacing Options -> Serial -> No -> Yes
sudo reboot
sudo apt-get update
sudo apt-get install gpsd gpsd-clients
sudo pip3 install gps3
USBAUTO="false"
DEVICES="/dev/ttyS0"
GPSD_OPTIONS="/dev/ttyUSB0
mkdir ~/Documents/MAX-XXX_GNSS_HAT_Code
cd ~/Documents/MAX-XXX_GNSS_HAT_Code/
wget https://files.waveshare.com/upload/0/0f/MAX-XXX_GNSS_HAT_Code.zip
unzip MAX-XXX_GNSS_HAT_Code.zip
cd ~/Documents/MAX-XXX_GNSS_HAT_Code/RaspberryPi/python/coordinate_converter
sudo python3 main.py
sudo apt-get install git
cd ~/Documents
sudo git clone https://github.com/beta-tester/RPi-GPS-PPS-StratumOne.git
cd RPi-GPS-PPS-StratumOne
sudo chmod 777 install-gps-pps.sh
</syntaxhighlight>

== Notes and version constraints ==
* The source text contains placeholders like MAX-XXX throughout; whether all commands apply exactly to the NEO-M8T requires manual verification.
* Exact COM port assignments and baud rates for Windows operation are version-specific and need confirmation.
* NTP server setup depends on the specific StratumOne fork; the IP address 192.168.6.93 is an example and must be adapted to the local network.
* Missing context regarding firmware states, drivers, or specific Raspberry Pi models should be clarified before deployment.

== Source and revision record ==
* [https://www.waveshare.com/wiki/NEO-M8T_GNSS_TIMING_HAT NEO-M8T GNSS TIMING HAT - Waveshare Wiki]
* Source revision: 77134
* Captured: 2026-09-01T03:18:01+00:00
* SHA-256: <code>8c90d7397908d8eb9af0c845031496be9dcfe81d79c8168bf0c7a4339c35f3f4</code>

WSAL18294 – NEO-M8T GNSS TIMING HAT/en - Versionsgeschichte

JWTechPublisher: Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex