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The F4S is the upgraded version of the original F4 from CL Racing. It is designed to be simpler to use with many features integrated into the board. This is an all-in-one flight controller for quadcopters with integrated PDB, OSD, buzzer and SD card slot for logging your flights. The layout of this AIO board allows for lovely clean builds with ESC solder pads on the top and XT60 pads on the bottom. VTX and cam pads are also on top.

New features for the F4S: -

  • Integrated 5V/2A BEC
  • Integrated user selectable 9V or 5V 2A filtered BEC for camera and video transmitter
  • Dedicated hardware invertor connect to UART3 for smartport telemetry
  • 6 layer 2oz copper PCB
  • Dedicated camera setting control pads along with camera power signal pads
  • 4-in-1 ESC socket with external current sensor input
  • Added TX1 and TX6 pads
  • Support for external current sensor from 4 in 1 ESC

Use the CLRACINGF4 firmware target.

Build tips from Mr Lin: -

  • Solder the main battery lead to the board first.
  • Check on the bottom label: UART 1 -> sBus. UART 3 – > telemetry
  • TX4 for the smart audio if you use it.
  • If adding the buzzer, go to your CLI and paste "set beeper_frequency = 0" enter and click save.
  • For telemetry. select the UART3 as smartport. go to CLI and paste "set tlm_halfduplex = off"
  • If using a 4-in-1 ESC, you can use the cable that comes with the flight controller but you may have to shift the pin around to get the current motor layout. If the ESC has a current sensor, you can use the solder pads label as (EXT) for the external Current sensor (INT) for internal current sensor
  • NB: After soldering, please check continuity on all 4 motor signal wires to battery positive and battery negative. If those have continuity. that is a big problem that smoke stoppers will not prevent!

Please test using the USB port prior to soldering as soldered boards will not be accepted for return.

Designed by Cheng Lin.

CL Racing F4S specification and layout

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