Reyax RYS8839_LITE L1/L5 Dual-Band GNSS Module Lite Evaluation Board

The module communicates via a standard UART (serial) interface. By default, it is configured for a baud rate of 115200 bits per second (bps). You can connect the module's TX and RX pins directly to a microcontroller's UART pins. The baud rate can typically be reconfigured using specific AT commands or configuration packets sent to the module, as detailed in the Reyax datasheet.

The module requires a supply voltage between 1.75V and 1.85V. For a battery-operated design, you can use a single-cell LiPo battery (nominal 3.7V) with a low-dropout (LDO) voltage regulator set to 1.8V. Alternatively, a 2xAA battery setup (3V) with a buck-boost converter can be used. Ensure your power source can handle the module's operational current, especially during satellite acquisition, while the idle current is only 2mA.

Yes, integration is straightforward. Connect the module's VCC (1.8V), GND, TX, and RX pins to your microcontroller. Since the module operates at 1.8V logic levels, you must use a logic level converter between the module's UART pins and a 3.3V or 5V microcontroller like an ESP32 or Arduino. Then, use a serial library in your Arduino IDE or ESP-IDF sketch to parse the standard NMEA sentences output by the GNSS module for latitude, longitude, and time data.