7Semi L89HA Multi-GNSS Breakout Module w/ Dual-Band L1/L5

Connect the module's VCC (3.3V), GND, TX, and RX pins to your microcontroller. The L89HA communicates via standard UART serial at a default baud rate (typically 9600 or 115200 bps). Use a software or hardware serial port on your Arduino/ESP32 to send NMEA sentences or proprietary binary commands for configuration and to receive positioning data. Ensure the power supply is within the 3.1V to 4.3V range.

Dual-band reception significantly improves positioning accuracy, especially in challenging environments. The L5 band signal is more robust with a wider bandwidth and higher power, which helps mitigate errors caused by ionospheric delay and signal multipath (reflections off buildings). This results in more consistent and reliable sub-meter-level accuracy, making the module suitable for applications like precision agriculture, drone navigation, and automotive ADAS systems where single-band GPS would be insufficient.

The L89HA breakout comes with integrated patch and chip antennas, which are sufficient for most applications. While the primary design utilizes these embedded antennas, the underlying chipset may support an external antenna input. You would need to consult the official 7Semi L89HA datasheet for specific pinouts related to an external RF input and ensure proper impedance matching (50 ohms) and DC bias for an active antenna if that feature is exposed on the breakout board's headers.

SBAS support is typically enabled by default. You can verify and configure it by sending specific UART command strings to the module. Refer to the protocol specification sheet for the exact binary or NMEA command set (often PMTK or proprietary commands) to query and enable/disable specific SBAS systems (WAAS, EGNOS, MSAS, GAGAN). Configuration is done via the same serial interface used for data output, requiring you to send the appropriate command sequence before the module begins applying differential corrections.