# FEBERIS Documentation

Enhance your Flipper Zero with the FEBERIS GPIO expansion module, featuring an ESP32 with JTAG access and support for included, swappable CC1101 or NRF24L01 radio modules.

# Table of Contents

  1. Introduction
  2. Package Contents
    2.1. FEBERIS Module
    2.2. CC1101 Radio Module
    2.3. NRF24L01 Radio Module
    2.4. Two Antennas
  3. Key Features
    3.1. ESP32 Microcontroller
    3.2. JTAG Port
    3.3. Connectors for CC1101/NRF24L01
    3.4. Rear Switch
    3.5. Protective Cover
  4. Preparing and Installing the FEBERIS Module
    4.1. Remove the Protective Cover
    4.2. Select the Desired Module (ESP32 or CC1101/NRF24L01)
    4.3. Connect the Antenna
    4.4. Attach FEBERIS to Flipper Zero
  5. Programming and Debugging
    5.1. Programming the ESP32 using Flipper Zero and the ESP Flasher Application
    5.2. ESP32 Programming via JTAG
    5.3. CC1101/NRF24L01 Configuration
  6. Maintenance and Safety
    6.1. Protective Cover
    6.2. Storage
    6.3. Operating Conditions

# Introduction

FEBERIS is a GPIO expansion module designed to work seamlessly with the Flipper Zero device. It integrates an ESP32 microcontroller, a JTAG port for programming and debugging, and provides connectors for the CC1101 or NRF24L01 radio modules (only one can be used at a time). The module is enclosed in a protective case with a rear switch to choose between the ESP32 and the CC1101/NRF24L01 modules. Additionally, a cover is provided to protect the GPIO pins when the device is not in use.

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# Package Contents

# FEBERIS Module

  • Includes an ESP32 chip, JTAG port, and connectors for CC1101/NRF24L01.

# CC1101 Radio Module

  • Designed for sub-GHz communication.

# NRF24L01 Radio Module

  • Designed for 2.4 GHz communication.

# Two Antennas

  • Short antenna: For CC1101 (sub-GHz).
  • Long antenna: For NRF24L01 (2.4 GHz) and ESP32 (Wi-Fi/Bluetooth).

# Key Features

# ESP32 Microcontroller

  • Provides Wi-Fi and Bluetooth capabilities.
  • Can operate as a standalone microcontroller or enhance the functionality of the Flipper Zero.

# JTAG Port

  • Enables programming and low-level debugging of the ESP32 or other compatible devices.

# Connectors for CC1101/NRF24L01

  • Only one radio module can be used at a time.
  • Each module supports different frequency ranges.

# Rear Switch

  • Allows selection between the ESP32 or CC1101/NRF24L01 modules.
  • Must be set before powering on the device.

# Protective Cover

  • Safeguards the GPIO pins from damage when the module is not in use.

# Preparing and Installing the FEBERIS Module

# Remove the Protective Cover

  • If the cover is in place, gently remove it to expose the GPIO pins on the FEBERIS module.

# Select the Desired Module (ESP32 or CC1101/NRF24L01)

  • Use the switch located on the rear side of the FEBERIS module to choose the active hardware.
  • If using CC1101 or NRF24L01, plug in the respective module and connect the appropriate antenna.

# Connect the Antenna

  • For CC1101: Use the short (sub-GHz) antenna.
  • For NRF24L01 or ESP32: Use the long (2.4 GHz) antenna.

# Attach FEBERIS to Flipper Zero

  • Align the FEBERIS module with the Flipper Zero’s GPIO connector.
  • Carefully press down until it is firmly seated.

# Programming and Debugging

# Programming the ESP32 using Flipper Zero and the ESP Flasher Application

  • Make sure the rear switch on FEBERIS is set to ESP32.
  • Navigate to the ESP Flasher application (ensure you have it installed; if not, obtain it from the appropriate Flipper Zero app repository).
  • Connect the FEBERIS module to the Flipper Zero’s GPIO pins as explained in the “Preparing and Installing” section.
  • Launch the ESP Flasher application on Flipper Zero.
  • Follow the on-screen instructions to select and flash the desired firmware onto the ESP32.
    • You may need to provide a path or location of the firmware image, depending on the ESP Flasher’s interface.
  • Wait for the flashing process to complete, then reboot the ESP32 (power cycle the FEBERIS module if needed).

# ESP32 Programming via JTAG

  • Connect a JTAG programmer (with a USB interface, for example) to the FEBERIS JTAG port.
  • Configure your development environment (e.g., PlatformIO, Arduino IDE, or Espressif IDF) with the correct JTAG settings.
  • Compile and upload your firmware to the ESP32.

# CC1101/NRF24L01 Configuration

  • These radio modules are generally configured via software running on the Flipper Zero.
  • Ensure your selected frequency range and communication protocol match those supported by the module.

# Maintenance and Safety

# Protective Cover

  • When the FEBERIS module is not in use, place the cover on the GPIO pins to prevent damage or contamination.

# Storage

  • Store the module in a cool, dry place away from extreme temperatures or high humidity.

# Operating Conditions

  • Recommended temperature range: –10°C to 60°C.
  • Avoid bending or pressing on the FEBERIS and its connectors.