FETtec FC G4 - N Manual

Introduction

Thank you for purchasing the FETtec FC G4 - N.

Features

Latest STM32G4 Processor
170Mhz + Math accelerator
MPU6000
Supply voltage 6-27V (2S-6S Lipo)
2x dedicated onboard BEC (max. 600mA each)
- 5V BEC for RX
- 5V/16V BEC for VTX (switchable and real Pit*)
2x 8 pin connector for solder free ESC connection
- Connector 1: ESC signal 1-4, telemetry, VCC, GND
- Connector 2: ESC signal 5-8 (depending on UAV type 1-4), telemetry, VCC, GND
1x 8 pin connector for solder free VTX, cam connection and OSD or digital systems
- real Pit* VCC, GND, Video in, Video out, BEC 5V/16V, VCS/TX3, RX3
2x 6 pin connectors for serials
- RX1, TX1, 3.3V, VCC, 5V, GND
- RX3, VCS/TX3, RGB LED, VCC, 5V, GND
1x 4 pin connector for receiver
- Signal, TLM, 5V, GND
5 UART serials
- UART 1 free
- UART 2 used for Receiver
- UART 3 free
- UART 4 free
- UART 5 used for ESCs / TLM / Onewire
4 ESC solder pads (Signal/GND) in each corner
Buzzer pads
4 tiny RGB LEDs (selectable color)
Supported ESC protocols
- PWM, Oneshot125, Oneshot42, Dshot150/300/600/1200/2400, FETtec Onewire
FETtec KISS firmware

Maximum outside dimensions: 37,2 x 37,2mm, without outside tips 30 x 30mm

Mounting hole arrangement:

20 x 20mm with M2 mounting hole (expandable to M3)
30 x 30mm with M3 mounting hole
30 x 30mm mounting hole tips are removable to reduce overall FC size

Overall height: 7,9mm

Weight: 5,37g

Connector type: JST-SH-1mm

*real Pit-Mode: A power supply pin which is remotely switchable

Safety warning

Remove propeller before flashing and configuration
always flash latest firmware before operation

Recommended steps for installation of the FETtec FC G4 - N

Connect to FETtec Configurator and update to the latest firmware (see FC firmware update)
Install the FC in your copter (see Connection diagrams for correct wiring and installation)
Make sure everything is connected properly and check without propellers
Connect to KISS GUI to proceed with final configuration of the FETtec FC G4 - N (FC configuration)

Connection Diagram

Connection Layout top

The 8 pin connector combines all necessary connections for analog or digital VTX and camera. It includes:

Real Pit VCC (Lipo+)
GND for cam and VTX
Video in: Analog video signal from cam
Video out: Analog video to VTX
BEC 5V/16V: power supply for cam and/or VTX, switchable voltage, real Pit capable
VCS/TX3: for smart audio / tramp configuration or TX for digital FPV systems
RX3: for digital FPV systems

6 pin connector (SER3):

RX3: for digital FPV systems or other functions configurable in GUI (same for VCS/TX3)
VCS/TX3: for smart audio / tramp configuration or TX for digital FPV systems
RGB LED: PWM signal pin to control WS2812 LEDs or similar (configurable in GUI)
VCC: Battery voltage
5V
GND

Connection Layout bottom

8 pin ESC connector 1:

VCC: Battery voltage out to supply FC power
GND
TLM/Onewire: ESC Telemetry signal to FC or Onewire signal pin (depending on configuration)
ESC signal 1-4: ESC signal output for each ESC

8 pin ESC connector 2:

VCC: Battery voltage out to supply FC power
GND
TLM/Onewire: ESC Telemetry signal to FC or Onewire signal pin (depending on configuration)
ESC signal 5-8: ESC signal output for each ESC (outputs ESC signal 1-4 if UAV type is configured as BI, TRI, QUAD)

Receiver connector:

GND
5V
TLM: Telemetry signal to receiver (see page 10 receiver connection diagram for further information)
Signal: Receiver signal to FC (see page 10 receiver connection diagram for further information)

6 pin connector (SER1):

RX1: function configurable in GUI
TX1: function configurable in GUI
3,3V
VCC: Battery voltage
5V
GND

Acronym explanation:

BEC 5V/16V: switchable voltage (in GUI) and real Pit capable
GND: Reference Signal Ground
Real Pit VCC: real Pit capable VCC pin
Reset: Reset button to force the FC in bootloader mode, not needed for normal operation
SIG.: receiver signal (serial)
TLM: Telemetry signal output for receiver (Serial)
TLM / Onewire: ESC telemetry input or Onewire signal depending on configuration
VCC: Battery input voltage (6V-27V)
VCS: Video control signal (smart audio/tramp)

ESC connection diagram

ESC connection via 8 pin connector

For easy ESC connection via 8 pin cable

FETtec FC G4 - N to FETtec 4in1 ESC 45A (same for FETtec 4in1 ESC 35A), cable included with FETtec ESCs.

Any other ESC is usable (please make sure the signal pinout is correct, otherwise change accordingly)

Single ESC connection diagram

The FETtec FC G4 - N provides 4 ESC signal pads for solder connection of single ESCs

Receiver connection diagram

Receivers can be connected via receiver connector (on bottom side of FC) or receiver solder pads (on top side of FC)

TBS Crossfire

SBUS receiver / FrSky R-XSR

Analog FPV connection diagram

VTX and cam can be connected via FPV connector (on top side of FC) or FPV solder pads (on top side of FC)

Note: RX and TX connection is only used for cameras which support serial connection

Digital FPV connection diagram

Caddx Vista FPV system

Fatshark Shark Byte system

FC configuration

Download KISS GUI: https://github.com/flyduino/kissfc-chrome-gui/releases

After installing the KISS GUI connect the FETtec FC G4 - N via USB. Open the KISS GUI and select the serial port on which the FC shows up and press connect.

Activate the FETtec FC G4 - N in the KISS GUI by pressing activate on the following prompt

Now you can set up the FC according to your wishes. To ensure that your settings are not getting lost, use the backup function by pressing the button “backup” and saving the configuration as a text file.

FC firmware update

For Firmware updates download the FETtec Configurator available here: https://github.com/FETtec/ESC-Configurator

After installing the FETtec Configurator open it and select the serial port the FC shows up and press connect.

You should see the FETtec FC G4 as shown.

Click "Remote Firmware” button and select the latest available firmware.

Press "Flash selected!"

FC is flashed now!

Settings can be made in the KISS GUI.

We recommend to always use the latest available firmware to get the best user experience.

If you like to try new features and firmware developments you can join our Discord channel and download the latest beta firmware to try on your own risk (https://discord.gg/pfHAbahzRp)

Dimensions