GPS parsing module. Can send commands to, and parse simple NMEA data sentences from serial and I2C GPS modules to read latitude, longitude, and more.

This driver depends on:

• Adafruit CircuitPython

Please ensure all dependencies are available on the CircuitPython filesystem. This is easily achieved by downloading the Adafruit library and driver bundle.

On supported GNU/Linux systems like the Raspberry Pi, you can install the driver locally from PyPI. To install for current user:

pip3 install adafruit-circuitpython-gps

To install system-wide (this may be required in some cases):

sudo pip3 install adafruit-circuitpython-gps

To install in a virtual environment in your current project:

mkdir project-name && cd project-name python3 -m venv .venv source .venv/bin/activate pip3 install adafruit-circuitpython-gps

See examples/gps_simpletest.py for a demonstration of parsing and printing GPS location.

Important: Feather boards and many other circuitpython boards will round to two decimal places like this:

>>> float('1234.5678') 1234.57

This isn't ideal for GPS data as this lowers the accuracy from 0.1m to 11m.

This can be fixed by using string formatting when the GPS data is output.

An implementation of this can be found in examples/gps_simpletest.py

import time import board import busio import adafruit_gps RX = board.RX TX = board.TX uart = busio.UART(TX, RX, baudrate=9600, timeout=30) gps = adafruit_gps.GPS(uart, debug=False) gps.send_command(b'PMTK314,0,1,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0') gps.send_command(b'PMTK220,1000') last_print = time.monotonic() while True: gps.update() current = time.monotonic() if current - last_print >= 1.0: last_print = current if not gps.has_fix: print('Waiting for fix...') continue print('=' * 40) # Print a separator line. print('Latitude: {0:.6f} degrees'.format(gps.latitude)) print('Longitude: {0:.6f} degrees'.format(gps.longitude))

These two lines are the lines that actually solve the issue:

print('Latitude: {0:.6f} degrees'.format(gps.latitude)) print('Longitude: {0:.6f} degrees'.format(gps.longitude))

Note: Sending multiple PMTK314 packets with gps.send_command() will not work unless there is a substantial amount of time in-between each time gps.send_command() is called. A time.sleep() of 1 second or more should fix this.

API documentation for this library can be found on Read the Docs.

For information on building library documentation, please check out this guide.

Contributions are welcome! Please read our Code of Conduct before contributing to help this project stay welcoming.