Product overview
The Happymodel Crazybee F4 Lite 1s combines flight control, four motor ESCs, a radio receiver and a video transmitter on a 28.5 × 28.5mm board for tiny whoop integration. Its STM32F411CEU6 processor runs at 100MHz with 512K flash, paired with an SPI-connected MPU-6000 sensor. Integrated Betaflight OSD, voltage detection and a 5V 1A BEC add onboard functions within that footprint. This is a flight controller assembly for installation in an aircraft, with a specified 1S battery input of DC 2.9V–4.35V.
Receiver configurations comprise Frsky SPI D8 and Flysky SPI versions, with separate firmware targets. Frsky provides eight channels for compatible Non EU D8 transmitters; Flysky switches between eight-channel AFHDS and fourteen-channel AFHDS-2A. Both support failsafe, with 100–200m range specified under no-ground-interference conditions and both radio endpoints 1m above ground. The ESC supports 5A continuous and 6A peaks for three seconds. The onboard 25mW VTX offers 40 channels across five 5.8GHz bands, including Race band, and SmartAudio readiness. External receiver integration must respect the restriction against simultaneous R1 and IR1 use.
Specifications
| Specification | Value & conditions |
|---|---|
| Product and purpose | Happymodel Crazybee F4 Lite 1s flight controller for tiny whoop aircraft, integrating FC, ESC, receiver and VTX functions. |
| Frsky firmware target | CrazybeeF4FRFrsky SPI receiver version. |
| Flysky firmware target | CrazybeeF4FSFlysky SPI receiver version. |
| Flight controller processor | STM32F411CEU6; 100MHz; 512K flash. |
| Sensor | MPU-6000 with SPI connection. |
| Board dimensions | 28.5 × 28.5mm |
| Flight controller supply voltage | DC 2.9V–4.35V1S battery input. |
| Integrated ESC architecture | BLHeli_S 4-in-1 ESC; 5A each; DSHOT600 ready. |
| On-screen display | Built-in Betaflight OSD with SPI control. |
| Battery eliminator circuit | Built-in 5V 1A BEC. |
| Voltage monitoring | Built-in voltage detection. |
| External receiver signal inputs | R1 (RX1) accepts IBUS/DSM2/DSMX; IR1 (IRX1) accepts already-inverted SBUS. R1 and IR1 cannot be used simultaneously. |
| ESC processor | MCU upgraded to EFM8BB21.Onboard 4-in-1 ESC. |
| ESC battery support | 1S LiPo or LiPo HV.Onboard 4-in-1 ESC. |
| ESC current rating | 5A continuous; 6A peak for 3 seconds.Onboard 4-in-1 ESC; peak current limited to 3 seconds. |
| ESC programming | Programmable through BLHeliSuite.Onboard 4-in-1 ESC. |
| ESC factory firmware and default protocol | Factory firmware: O_H_5_REV16_7.HEX; default protocol: DSHOT600.Onboard 4-in-1 ESC. |
| Frsky receiver interface and compatibility | SPI bus receiver compatible with Frsky D8 and Non EU transmitters in D8 mode.Frsky SPI D8 receiver version; Non EU transmitter in D8 mode. |
| Frsky channels and failsafe | 8 channels; failsafe support.Frsky SPI D8 receiver version. |
| Frsky receiver range | 100m–200mFrsky SPI D8 receiver version; no ground interference, with transmitter and receiver 1m above the ground. |
| Flysky receiver interface and protocols | SPI bus receiver with switchable AFHDS and AFHDS-2A protocols.Flysky SPI receiver version. |
| Flysky channel counts | 8 channels with AFHDS; 14 channels with AFHDS-2A.Flysky SPI receiver version; channel count depends on protocol. |
| Flysky receiver range | 100–200mFlysky SPI receiver version; no ground interference, with transmitter and receiver 1m above the ground. |
| Flysky failsafe | Failsafe support.Flysky SPI receiver version. |
| Video transmitter output power | 25mWOnboard 5.8GHz VTX. |
| Video frequencies and channels | 5.8GHz; 5 bands; 40 channels; Race band included.Onboard VTX. |
| Video transmitter input voltage | 3.3V 5.5VOnboard VTX. |
| Video transmitter current consumption | 300mA typical.Onboard VTX; typical current consumption. |
| Video transmitter control | SmartAudio ready.Onboard VTX. |
