Gravity: GNSS GPS BeiDou Positioning Module with RTC - I2C&UART

DFROBOT DFR1103

The Gravity GNSS Positioning & Timing Module integrates satellite positioning functionality and a real-time clock (RTC). The module automatically obtains satellite time based on a preset calibration period and accurately calibrates the onboard RTC chip. This calibration effectively eliminates time errors caused by the RTC chip during extended operation or accidental situations.

The system automatically cuts off power to the GNSS chip after calibration, significantly reducing overall system power consumption compared to GNSS-only solutions. Additionally, the user has the option to use the module as a positioning module by setting GNSS active all the time， providing accurate longitude, latitude, time, altitude, and other data.

The module offers two data output types: I2C and UART. It is compatible with Arduino, ESP32, Raspberry Pi and other mainstream control devices. Ideal for scenarios requiring extended working hours and high-precision time, such as astronomical observation timers, NTP servers, and outdoor wireless sensor time synchronization.

The differences between Gravity: GNSS Module with RTC Function and Gravity: GNSS Receiver Module:

Unlike the traditional Gravity: GNSS GPS BeiDou Receiver Module - I2C&UART, which is a single GNSS module with high power consumption and is only suitable for outdoor scenarios, this Gravity: GNSS Module with RTC Function offers a significant improvement.

The Gravity: GNSS GPS BeiDou Positioning Module with RTC Function has the ability to turn off the GNSS when not in use, leaving only the RTC module to maintain time, resulting in lower power consumption.

Figure: Wiring Diagram of Gravity: GNSS Positioning Timing Module and DFRduino UNO R3

 

Figure: Positioning &Timing Results Display

Integrated GNSS and RTC FunctionalityAutomatic Satellite Time CalibrationRTC Chip CalibrationPower EfficiencySatellite Signal Loss Mitigation

Operating Voltage: 3.3~5V DCOutput Signal: I2C/UARTGNSS IC: L76KGNSS Accuracy: 2.0m CEPFirst positioning time: 30s (Cold start), 2s (Hot Start)Operation current:
       GNSS enable: 46mA
       GNSS chip off ＜1mAAntenna Interface: IPEX 1Antenna Frequency: 1561~1575.42MHz±3MHzRTC IC: SD3031Time range: Year 2000~2099Time Accuracy: ±3.8ppm @25℃PCB Size: 32mm*42mm

Product wikiSchematicDimension & Layout

Gravity: GNSS Positioning & Timing module x1GPS / BeiDou Active Ceramic Antenna (IPEX1 Connector) x1Gravity 4P sensor cable x110 P connector x1