gps-modules

Goal: Interface GPS/GNSS receivers (NEO-6M, NEO-M8N, ATGM336H) with microcontrollers to parse location, speed, and precision timing.

1. Hardware Connection

• Interface: UART / Serial.
• Default Baud Rates: Usually 9600 bps (NEO-6M) or 38400 bps (NEO-M8N).
• Wiring: TX (GPS) -> RX (MCU), RX (GPS) -> TX (MCU).
• PPS Pin: Pulse Per Second. Rises exactly on the UTC second boundary. Essential for NTP stratum-1 servers.

2. NMEA Parsing (Arduino/C++)

GPS modules constantly stream ASCII NMEA sentences over UART.

• $GPRMC: Minimum Recommended Specific GPS/Transit data (Time, Lat, Lon, Speed).
• $GPGSV: Satellites in view.

Library: Use TinyGPSPlus for easy C++ parsing.