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Add FoBE Base Cube nRF52840 document.
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‎docs/product/f2102/index.mdx‎

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---
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title: Overview
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sidebar_label: Overview
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description: Overview of FoBE Base Cube nRF52840.
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order: 1
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---
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# FoBE Base Cube nRF52840
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#### A complete outdoor LoRa communication device.
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<br/>
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<div style={{ textAlign: 'center' }}>
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<img src="/img/products/f2102-r1lg.main.png" alt="FoBE Base Cube nRF52840 Main" style={{ width: '80%', height: 'auto' }} />
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</div>
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<br/>
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## Introduction
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FoBE Base Cube nRF52840 is a complete application board designed for outdoor LoRa communication. It integrates a nRF52840 MCU, GPS, buzzer, gyroscope, display screen, and LoRa transceiver, providing all the necessary features for an outdoor LoRa communication device.
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The board features a rotary encoder, two buttons for easy user interface operation, an onboard BLE antenna for convenient configuration, a 0.96-inch OLED screen, and two indicator LEDs. It also includes a USB-C connector, reserved SWDIO/SWCLK header holes on the side, an 8-pin header for external expansion with 6 GPIO pins, and two IPEX antenna connectors for LoRa and GPS antennas. The gyroscope IC includes a 3D digital accelerometer and a 3D digital gyroscope.
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## Key Features
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* **Core Components:**
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* nRF52840 MCU
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* GPS module with IPEX antenna connector
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* LoRa transceiver with IPEX antenna connector
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* 0.96-inch OLED screen
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* Gyroscope IC with a 3D digital accelerometer and a 3D digital gyroscope
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* **User Interface:**
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* Rotary encoder for easy navigation
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* Two user buttons
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* Two indicator LEDs
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* Onboard BLE antenna
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* **Connectivity and Expansion:**
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* USB-C connector
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* Reserved SWDIO/SWCLK header holes
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* 8-pin header with 6 GPIO pins for external expansion
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* 2pin MX1.25 battery input interface
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## Packing List
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| Part | Quantity |
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| ---------------------------- | -------- |
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| FoBE Base Cube nRF52840 board | 1 |

‎docs/product/f2102/quickstart.mdx‎

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---
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title: Quick Start
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sidebar_label: Quick Start
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---
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This guide introduces the FoBE Base Cube nRF52840 and how to use it.
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## Hardware diagram
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The following figure illustrates the FoBE Base Cube nRF52840 hardware diagram.
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<br/>
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<div style={{ textAlign: 'center' }}>
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<img src="/img/products/f2102-r1lg.digram.png" alt="FoBE Base Cube nRF52840 Hardware Diagram" style={{ width: '80%', height: 'auto' }} />
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</div>
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<br/>
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<br/>
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<div style={{ textAlign: 'center' }}>
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<img src="/img/products/f2102-r1lg.digram-1.png" alt="FoBE Base Cube nRF52840 Hardware Diagram-1" style={{ width: '80%', height: 'auto' }} />
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</div>
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<br/>
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## Mechanical dimensions
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FoBE Base Cube nRF52840 is a compact PCB with dimensions of 50mm * 50mm, designed for outdoor LoRa communication.
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<br/>
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<div style={{ textAlign: 'center' }}>
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<img src="/img/products/f2102-r1lg.dimensions.png" alt="FoBE Base Cube nRF52840 Mechanical Dimensions" style={{ width: '80%', height: 'auto' }} />
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</div>
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<br/>
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## Power Supply
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* GPS power (GNSS-3V3) is controlled by MCU P0.26. GPS data backup power is not controlled.
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* Screen, buzzer, and external header power (PERI-3V3) are controlled by MCU P0.16.
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## Status Indicators
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The board has two indicator LEDs:
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* Power LED
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* Charging Indicator LED
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## Buttons
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The board has two buttons:
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* Reset Button
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* User Button (connected to MCU P1.00)
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## Shielding Pads
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The MCU and LoRa IC have reserved shielding pads, allowing users to add shielding covers for improved signal performance.
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## Battery Management
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* The battery charging IC directly manages the battery connection.
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* The NTC header is directly connected to the charging IC.
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* Battery voltage is measured using a voltage divider circuit (1M and 1.5M resistors), and the measurement is read by MCU P0.05.
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## Sub-GHz Radio (LoRa)
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The FoBE Base Cube nRF52840 board features an on-board sub-GHz radio module based on the Semtech SX1262. It supports LoRa and (G)FSK modulation and operates in the 433 MHz, 868 MHz, and 915 MHz frequency bands (depending on the model). An integrated 1.8V TCXO ensures excellent stability across temperature variations.
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Key specifications include a low active receive current of just 4.2 mA, a maximum transmit power of up to +22 dBm, and high sensitivity down to -148 dBm, providing excellent interference immunity.
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The module connects to the nRF52840 SoC via SPI for long-range wireless communication:
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| SX1262 Pin | GPIO Pin |
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|-----------|----------|
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| MISO | **P0.24** |
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| MOSI | **P0.22** |
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| SCK | **P0.20** |
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| NSS | **P1.08** |
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| RST | **P0.13** |
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| BUSY | **P0.15** |
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| DIO1 | **P0.17** |
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| RXEN | **P0.11** |
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## GPS
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The GPS module has the following pin assignments:
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| GPS Pin | GPIO Pin |
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|-----------|----------|
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| RST | **P0.04** |
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| RXD | **P0.12** |
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| TXD | **P1.09** |
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| PPS | **P0.08** |
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| WAKE | **P0.06** |
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### GNSS Configuration Jumper
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The board features a GALAXY solder pad. Soldering this pad configures the module to use GPS + GLONASS. By default, the pad is not soldered, and the module uses BeiDou + GPS.

‎docs/product/f2102/resources.mdx‎

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---
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title: Resources
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---
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**\[PDF\]** [FoBE Base Cube nRF52840 Datasheet](/)
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**\[PDF\]** [FoBE Base Cube nRF52840 Schematic](/)
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**\[PDF\]** [FoBE Base Cube nRF52840 Dimension](/)
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**\[DXF\]** [FoBE Base Cube nRF52840 Dimension](/)
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**\[STL\]** [FoBE Base Cube nRF52840 3D Model](/)

‎sidebars.js‎

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"product/f2101/resources",
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],
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},
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{
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type: "category",
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label: "FoBE Base Cube nRF52840",
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items: [
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"product/f2102/index",
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"product/f2102/quickstart",
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"product/f2102/resources",
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],
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},
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],
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};

‎static/img/products/f2102-r1lg.digram-1.png‎

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‎static/img/products/f2102-r1lg.digram.png‎

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‎static/img/products/f2102-r1lg.dimensions.png‎

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‎static/img/products/f2102-r1lg.main.png‎

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