Read GPS from Neo-6M GPS Module on a Raspberry Pi

neo-6m-gps-read-rpi.py

import re

latitude = None
longitude = None

def parse_gprmc(sentence):
    """Parse GPRMC sentence to extract and convert GPS coordinates."""
    parts = sentence.split(',')
    if len(parts) < 7 or parts[2] != 'A':  # Check for valid data (A = Active)
        return None, None

    # Parse latitude
    lat_raw = parts[3]
    lat_dir = parts[4]
    lat_deg = int(lat_raw[:2])
    lat_min = float(lat_raw[2:])
    latitude = lat_deg + (lat_min / 60)
    if lat_dir == 'S':
        latitude = -latitude

    # Parse longitude
    lon_raw = parts[5]
    lon_dir = parts[6]
    lon_deg = int(lon_raw[:3])
    lon_min = float(lon_raw[3:])
    longitude = lon_deg + (lon_min / 60)
    if lon_dir == 'W':
        longitude = -longitude

    return latitude, longitude

def read_gps():
    """Continuously read GPS data from /dev/ttyAMA0."""
    with open('/dev/ttyAMA0', 'r') as gps:
        while True:
            line = gps.readline().strip()
            if line.startswith('$GPRMC'):
                lat, lon = parse_gprmc(line)
                if lat is not None and lon is not None:
                    print(f"Latitude: {lat:.5f}, Longitude: {lon:.5f}")
                    latitude = f"{lat:.5f}"
                    longitude = f"{lat:.5f}"

if __name__ == "__main__":
    read_gps()