Driver - Ug-353 Gps

Now $GPGGA sentences appeared cleanly.

The garbage was not NMEA sentences (which start with $GP or $GN ). It was random binary noise. Marta grabbed an oscilloscope: the UG-353’s TX was 3.3V, but the CM4’s RX was configured for 1.8V logic due to a broken device tree overlay. She fixed the config.txt : ug-353 gps driver

The UG-353 was wired to UART5 on a Raspberry Pi Compute Module 4. Marta had written a simple systemd service to start gpsd with the correct options: Now $GPGGA sentences appeared cleanly

Marta was a firmware engineer for a small agricultural robotics startup. Her team had just switched from an old U-Blox GPS to the UG-353 (a common, low-cost 10Hz GPS module with a UART interface). The robot’s navigation stack was failing. “No fix,” the logs said. “No fix.” Marta grabbed an oscilloscope: the UG-353’s TX was 3