> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt # Gravity: GNSS GPS BeiDou Positioning Module with RTC - I2C&UART **Type:** Product page · **SKU:** DFR1103 · **Brand:** [DFRobot](https://core-electronics.com.au/brands/dfrobot-australia) **Page:** https://core-electronics.com.au/gravity-gnss-gps-beidou-positioning-module-with-rtc-i2cuart.html ([markdown](https://core-electronics.com.au/gravity-gnss-gps-beidou-positioning-module-with-rtc-i2cuart.html.md)) The module combines GNSS positioning and RTC functionality. Provides precise longitude, latitude, and altitude data. Compatible with Arduino, ESP32, and... ## Pricing - **Price:** $44.70 (inc GST) — $40.64 AUD, exc GST - **Quantity discounts:** 6+ $38.60 (exc GST) · 12+ $36.98 (exc GST) ## Availability & dispatch - Available with a lead time — expect dispatch between Aug 31 and Sep 02. ## How to buy - **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=DFR1103:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart. - **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/DFR1103:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.) - **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there. - **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works) - **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt ## Description The Gravity GNSS Positioning & Timing Module integrates satellite positioning functionality anda real-time clock (RTC). The module automatically obtains satellite time based ona preset calibration period and accurately calibrates the onboard RTC chip.This calibration effectively eliminates time errors caused by the RTC chip duringextended 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](https://core-electronics.com.au/arduino.html), [ESP32](https://core-electronics.com.au/development-boards/esp32.html) ,[Raspberry Pi](https://core-electronics.com.au/raspberry-pi.html) and [other mainstream control devices](https://core-electronics.com.au/development-boards.html). 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](https://core-electronics.com.au/gravity-gnss-gps-beidou-receiver-module-i2cuart.html) - 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.** ![Connection Diagram of Gravity: GNSS Positioning Timing Module and DFRduino UNO R3](https://core-electronics.com.au/attachments/localcontent/1_66967622f46.png) Figure: Wiring Diagram of Gravity: GNSS Positioning Timing Module and UNO R3 ![Detection Results Display (Timing & Positioning)](https://core-electronics.com.au/attachments/localcontent/5_20014d71a7c.jpg) Figure: Positioning &Timing Results Display ### Features - Integrated GNSS and RTC Functionality - Automatic Satellite Time Calibration - RTC Chip Calibration - Power Efficiency - Satellite Signal Loss Mitigation ### Specification - Operating Voltage: 3.3~5V DC - Output Signal: I2C/UART - GNSS IC: L76K - GNSS Accuracy: 2.0m CEP - First positioning time: 30s (Cold start), 2s (Hot Start) - Operation current: GNSS enable: 46mA GNSS chip off <1mA - Antenna Interface: IPEX 1 - Antenna Frequency: 1561~1575.42MHz±3MHz - RTC IC: SD3031 - Time range: Year 2000~2099 - Time Accuracy: ±3.8ppm @25? - PCB Size: 32mm\*42mm ### Documents - [Product wiki](https://wiki.dfrobot.com/_SKU_DFR1103_Gravity_GNSS_Position_And_Timing_Module) - [Schematic](https://core-electronics.com.au/attachments/localcontent/349fe1581429b4d94a30ec2bb6ca2525_27023358445.pdf) - [Dimension & Layout](https://core-electronics.com.au/attachments/localcontent/fbf22d786210f181f639a2ab818fe64e_6704318c534.jpg) ### Parts List - Gravity: GNSS Positioning & Timing module x1 - GPS / BeiDou Active Ceramic Antenna (IPEX1 Connector) x1 - Gravity 4P sensor cable x1 - 10 P connector x1 ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/D/F/DFR1103-1.jpg)