DFRobot
Gravity: GNSS GPS BeiDou Positioning Module with RTC - I2C&UART
· MPN: DFR1103
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##Introduction The Gravity GNSS Positioning & Timing Module integrates satellite positioning functionality and a real-time clock (RTC). The module automatica...
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##Introduction 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 R3Figure: Positioning &Timing Results Display ##Features Integrated GNSS and RTC FunctionalityAutomatic Satellite Time CalibrationRTC Chip CalibrationPower EfficiencySatellite Signal Loss Mitigation ##Specification 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 ＜1mA Antenna Interface: IPEX 1Antenna Frequency: 1561~1575.42MHz±3MHzRTC IC: SD3031Time range: Year 2000~2099Time Accuracy: ±3.8ppm @25℃PCB Size: 32mm*42mm ##Documents Product wikiSchematicDimension & Layout ##ShippingList Gravity: GNSS Positioning & Timing modulex1GPS / BeiDou Active Ceramic Antenna (IPEX1 Connector) x1Gravity 4P sensor cablex1 10 P connectorx1
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Plain-language definitions for the technical terms used above.
- ESP32
- ESP32 is a family of microcontroller modules with built-in wireless features such as Bluetooth and WiFi. Knowing this product uses an ESP32-based module helps explain how it provides wireless serial communication and firmware update features.
- GNSS
- GNSS stands for Global Navigation Satellite System, covering positioning systems such as GPS and similar satellite networks. It matters here because high-precision GNSS modules can output lots of serial position data that this product can send wirelessly to a computer or phone.
- GPS
- The US satellite navigation system used by GNSS receivers to calculate position and time. Support for GPS is important because it is widely available and often used together with other constellations for more reliable positioning.
- Gravity
- Gravity is DFRobot’s plug-in connector system for sensors, motors and modules, using standard cables to reduce loose jumper wiring. It matters because Gravity-compatible parts can connect directly to these ports, while non-Gravity parts may need adapters or manual wiring.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- PCB
- A printed circuit board is a rigid board with copper tracks that connect electronic parts without loose wires. For this kit, the PCBs also form the airplane shape, so they are both the circuit base and part of the finished model.
- RTC
- A Real-Time Clock keeps track of time even when the main processor is asleep or powered down, usually with a small backup battery. It matters for data logging and tracking projects that need accurate timestamps.
- UART
- UART is a simple serial connection that sends data over separate transmit and receive wires, often labelled TX and RX. It matters because this module is designed to replace a wired UART cable with a wireless link while keeping the same serial data format.
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