Happymodel Pancake 2-6S F4 AIO Whoop Flight Controller w/ ELRS RX & OpenVTX

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Designed with the help of the ExpressLRS team, the Happymodel Pancake AIO is a true all-in-one flight controller. The Pancake comes with an onboard 2.4GHz ELRS SPI receiver as well as a 5.8GHz OPENVTX. Mounting options include both 30.5mm and 20mm spaced holes. With a price point comparable to most AIOs without a VTX onboard, you're getting more out of your board at a lower cost. It is a great cost-effective FC replacement.

Browse the rest of our Whoop AIO Boards and all of our Happy Model products!



  • Built in OPENVTX max power is 400mw
  • Built in ELRS SPI RX 2.4GHz
  • Onboard Ceramic Antenna 

Specifications: Pancake 2-6S AIO FC

  • Firmware: CRAZYBEEF4SX1280
  • Input Voltage: 2-6S battery input
  • MCU: STM32F411CEU6 (100MHZ, 512K FLASH)
  • Gyro: MPU6000 (SPI connection)
  • Max Continuous Current: 12A
  • OSD: Yes
  • ESC Firmware: F_H_40_REV16_8.HEX
  • Mounting Pattern: 20×20mm or 35.5×35.5mm 
  • Weight: 5.2g
Onboard 5.8GHz OpenVTX
  • Firmware: OpenVTX
  • Smartaudio v2.1
  • PIT Mode support
  • RCE Mode support
  • Channels: 48ch
  • Transmitting Power: 0/RCE/25mw/100mw/400mw
  • Power supply: DC 5V
  • Current (5v): <650ma (400mw)
  • Antenna connector: U.FL

ELRS Version

  • Packet Rate: 50Hz/150Hz/250Hz/500Hz
  • ELRS Firmware Version: V2.0
  • RF Frequency: 2.4GHz
  • Antenna: SMD Ceramic antenna
  • Telemetry output Power: <12dBm


  • 1x Happymodel Pancake 2-6S F4 AIO Whoop Flight Controller w/ ELRS RX & OpenVTX
  • 1x XT60 Pigtail
  • 1x Mounting Hardware
  • 1x U.fl Antenna
  • 1x Wiring Harness