Happymodel CrazyF411 UART ELRS AIO 20A 4-In-1 Flight Controller

  • $59.99
    Unit price per 


The CrazyF411 ELRS flight controller comes with an integrated UART 2.4GHz ExpressLRS receiver and 20A Blheli_s ESC (Bluejay firmware pre-installed) which supports 2-4s. Bigger Mosfet supports up to 20A currents for 2-4S toothpick or long-range FPV drones.  The 2.4GHz ExpressLRS receiver is equipped with the SX1280 radio frequency chip with high sensitivity, high packet rate, and low latency, this flight controller is the one that all Race/Freestyle pilots have been waiting for.

Unlike most AIO boards, the built-in ELRS receiver uses UART communication with MCU, it’s like a separate ELRS receiver, which can be updated by Betaflight pass-through or WIFI, very simple.  Most built-in ELRS receivers on AIO boards use SPI, which cannot be updated separately through ELRS software.



  • MCU:STM32F411CEU6 (100MHZ, 512K FLASH)
  • Sensor: ICM42688P or BMI270 (SPI Control)
  • Mount pattern: 25.5×25.5 M2
  • Size:32*28*9mm
  • Power supply: 2-4S Lipo battery
  • Built-in 20A Blheli_s ESC each
  • Built-in Betaflight OSD(SPI Control)
  • Built-in UART ExpressLRS 2.4GHz receiver
  • Built-in 5V 1.5A BEC
  • Flight controller firmware target: CRAZYBEEF4DX


  • MCU upgraded to EFM8BB21
  • Power supply: 2-4S LiPo/LiPo HV (7v/17v)
  • Currents: 20A continuous peak 25A (5 seconds)
  • Support BLHeliSuite programmable
  • Factory firmware: Bluejay 0.18.1Firmware target: F_H_40_48_v0.18.1
  • Default protocol: DSHOT150/DSHOT300/DSHOT600


  • Packet Rate option: 25Hz/50Hz/150Hz/250Hz/500Hz
  • RF Frequency: 2.4GHzAntenna plug: IPEX
  • Telemetry output Power: <12dBm
  • Receiver protocol:  CRSF
  • Default firmware version: ExpressLRS V3.0.1


  • Voltage meter scale setting 110
  • Amperage meter scale setting 470

Happymodel CrazyF411 ELRS AIO Flight Controller

Binding Procedure:

  • Supply power to the flight controller by plug USB, wait until the green LED on the FC is off, immediately turn off the power, and then repeat again the above steps. When the FC is powered on for the third time, the green LED light will start to double-flash, which means that the RX enters the binding mode
  • Please make sure your ExpressLRS tx module firmware is v3.x.x. And go to ExpressLRS.lua from “TOOLS” menu of your radio transmitter. Then hit [Bind] to binding with the onboard ExpressLRS receiver. The green LED should blinking slowly first then turn to solid, that means binding was successfully. If the green led still keep double flash after binding ,please change Model Match tab value from “off” to “on” or from “on” to “off”

Receiver LED Status:

Green LED solid means bind successful or RC link established; Green LED double-flash means get into bind mode; Green LED flash slowly means no RC signal input from TX module; Green LED continuous flash fast means ExpressLRS wifi enabled.

Bind Successful:

Happymodel CrazyF411 ELRS AIO Flight Controller

Bind Mode:

Happymodel CrazyF411 ELRS AIO Flight Controller

No RC Input:

Happymodel CrazyF411 ELRS AIO Flight Controller

WiFi Mode:

Happymodel CrazyF411 ELRS AIO Flight Controller

Happymodel CrazyF411 ELRS AIO Flight Controller

1x Happymodel CrazyF411 UART ELRS AIO 20A 4-In-1 Flight Controller
1x Antenna
1x Power Connector
4x Anti-Vibration Grommets

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