Product description: RTK Postcard module - GNSS-RTK Quectel LG290P - ESP32-PICO-MINI-02 - SparkFun GPS-26916
SparkFun RTK Postcard is a professional RTK satellite positioning module designed for reliable and precise real-time navigation. Equipped with the Quectel LG290P receiver supporting RTK and PPP, it allows simultaneous tracking of multiple bands (L1, L2, L5, L6/E6) and GNSS constellations . The built-in ESP32-PICO-MINI microcontroller provides wireless communication via WiFi and Bluetooth , and the pre-installed RTK Everywhere software allows easy configuration as a base station, NTRIP client or RTCM transmitter. The module works perfectly with the optional Portability Shield, offering an OLED display , control buttons, Li-Pol charger and microSD slot. It is a compact yet extremely versatile solution for applications requiring centimeter-level accuracy.
RTK Postcard Module - GNSS-RTK Quectel LG290P - ESP32-PICO-MINI-02 - SparkFun GPS-26916. 
SparkFun RTK Postcard is an RTK satellite positioning module designed for reliable and precise real-time navigation.Special Features
- Support for multiple GNSS constellations - the LG290P module enables simultaneous reception of signals from GPS, GLONASS, Galileo, BeiDou (BDS), QZSS and NavIC systems. It also supports SBAS augmentation systems such as EGNOS, WASS, MSAS and GAGAN, which translates into high accuracy and reliability of location in all terrain conditions
- Multi-band reception - L1, L2, L5 and E6/L6 support for improved interference immunity, faster position acquisition and greater operational stability, especially in urban and forested environments
- RTK positioning precision - the device offers an accuracy of 0.8 cm + 1 ppm horizontally and 1.5 cm + 1 ppm vertically. The convergence time in RTK mode is just 5 seconds, making the module ideal for applications in surveying, precision agriculture, robotics and autonomous systems
- Wireless connectivity - the built-in ESP32-PICO-MINI provides access to WiFi (802.11b/g/n) and Bluetooth 4.2 (BR/EDR and BLE). This allows it to act as an NTRIP client or server, transmit RTCMv3 data and communicate with mobile applications
- Modern microcontroller ESP32-PICO-MINI-02 - a powerful system with two cores clocked at up to 240 MHz, with 8 MB Flash and 2 MB PSRAM. Supports numerous peripheral interfaces, such as UART, SPI, I2C, SDIO, ADC, DAC, PWM, CAN and Ethernet MAC, enabling the development of advanced functions
Practical applications
SparkFun RTK Postcard is an indispensable tool in projects requiring high position precision - such as autonomous vehicles, precision agriculture, surveying, GIS surveying or mobile robotics. Thanks to its compact size and open software, it is ideal for integration in portable devices and embedded systems. The ability to transmit RTCMv3 via WiFi, Bluetooth or ESP-NOW allows easy creation of distributed RTK systems based on wireless data transmission.
The module works perfectly with the optional Portability Shield, offering an OLED display, control buttons, LiPo charger and microSD slot.
It is a compact yet extremely versatile solution for applications requiring centimeter-level accuracy.Technical specification of the RTK Postcard module
- GNSS module: Quectel LG290P
- Supported constellations: GPS, GLONASS, Galileo, BDS, QZSS, NavIC, SBAS
- GNSS bands: L1, L2, L5, E6/L6
- RTK precision: horizontal 0.8 cm + 1 ppm, vertical 1.5 cm + 1 ppm
- Time to first fix:
- Cold start: 28 sec
- Hot start: 1.7 sec
- GNSS power consumption:
- Work: 91 mA
- Sleep mode: 12 µA
- ESP32-PICO-MINI:
- Processor: Dual-core Xtensa 32-bit LX6, up to 240 MHz
- Memory: 8 MB Flash, 2 MB PSRAM
- Current consumption: up to 368 mA (peak), 5 µA (deep sleep)
- Connectivity: WiFi, Bluetooth, BLE
- Connectors:
- USB Type-C
- JST-GH 4-pin (RTCM)
- JST-Qwiic x2
- SMA + u.FL antenna
- 19 pin PTH (2.54mm)
- Power supply: 3 V to 5.5 V
- Operating temperature: -40°C to 85°C
- Board dimensions: 43.2 x 43.2 x approx. 10 mm
- Weight: ~ 0.9 g
Kit Contents
- SparkFun RTK Postcard Module
- Connectors
