Happymodel CrazyF411 ELRS AIO 4in1 Flight controller The HappyModel CrazyF411 ELRS flight controller features an integrated UART-based 2.4GHz ExpressLRS receiver and a powerful 20A BLHeli_S ESC, pre-flashed with Bluejay firmware. Equipped with larger MOSFETs, this board is well suited for 2–4S toothpick builds and lightweight long-range FPV setups, delivering improved efficiency and reliable power handling. The onboard 2.4GHz ExpressLRS receiver uses the SX1280 RF chip, providing high sensitivity, fast packet rates, and ultra-low latency for responsive control. The built-in ELRS functions as a serial receiver, communicating via UART and supporting firmware updates through Betaflight pass-through or WiFi. Supplied with ELRS V3.0.1 firmware pre-installed, the CrazyF411 is a strong choice for race and freestyle pilots looking for a compact, capable all-in-one solution. It is also used in models such as the Crux35 as an alternative to the ELRS X1 flight controller. Product Information Flight controller 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 Onboard 4in1 ESC 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 Onboard UART ExpressLRS 2.4GHz Receiver 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 Onboard voltage and Amperage meters settings Voltage meter scale setting 110 Amperage meter scale setting 470 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 meanings 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 Bind mode No RC Input Wifi mode In the box 1 x Happymodel CrazyF411 ELRS AIO 4in1 Flight controller
