Product overview
The Happymodel DiamondF4 ELRS/FRSKY AIO 5-IN-1 combines flight control, four motor controllers, video transmission, Betaflight OSD and radio reception in an original whoop size compatible board. Its STM32F411CEU6 processor operates at 100MHz with 512K flash, paired with an SPI-connected MPU-6000, ICM20689 or BMI270 sensor. The integrated electronics include a 5V 1A BEC. Power input is limited to a 1S battery at DC 2.9V–4.35V, while the BLHeli_S ESC supports 5A continuous per channel and a 6A peak for three seconds.
Receiver configuration determines the firmware target and transmitter compatibility. The ELRS version uses 2.4GHz SPI ExpressLRS V2.0 with 50Hz/150Hz/250Hz/500Hz packet rates and compatible V2.0 transmitter modules; its receiver firmware cannot be flashed separately. FrSky supports eight-channel D8 operation with non-EU transmitters. The discontinued FlySky variant supports switchable AFHDS and AFHDS-2A. Integrated 5.8GHz OPENVTX offers 48 channels, SmartAudio v2.1, PIT and RCE modes, and output settings of 0/RCE/25mW/100mW/400mW. Its DC 5V supply current is less than 650mA at 400mW output.
Specifications
| Specification | Value & conditions |
|---|---|
| Product identity and architecture | Happymodel DiamondF4 ELRS/FRSKY AIO 5-IN-1 flight controller with integrated OPENVTX, ESC, OSD and receiver. |
| Flight controller processor | STM32F411CEU6; 100MHz; 512K flash. |
| Sensor options | MPU-6000, ICM20689 or BMI270, connected through SPI. |
| Physical integration | Original whoop size compatible. |
| Flight controller supply | DC 2.9V–4.35V.1S battery input. |
| Integrated motor control | Built-in BLHeli_S 4-in-1 ESC, 5A each, DSHOT600 ready. |
| Integrated OSD | Built-in Betaflight OSD with SPI control. |
| Integrated regulator | Built-in 5V 1A BEC. |
| ELRS flight controller firmware target | DiamondF4 ELRS; CrazybeeF4SX1280.ELRS SPI receiver version. |
| FrSky flight controller firmware target | DiamondF4 FR; CrazybeeF4FR.FrSky SPI receiver version. |
| FlySky flight controller firmware target | DiamondF4 FS; CrazybeeF4FS.Discontinued FlySky SPI receiver variant. |
| ESC processor | EFM8BB21.Onboard 4-in-1 ESC. |
| ESC supply and current | 1S LiPo/LiPo HV; 5A continuous, 6A peak for 3 seconds.Onboard 4-in-1 ESC; peak current limited to 3 seconds. |
| ESC programming and firmware | BLHeliSuite programmable; factory firmware O_H_5_REV16_8.HEX; default protocol DSHOT600.Onboard 4-in-1 ESC. |
| ELRS packet rates | 50Hz/150Hz/250Hz/500Hz.Onboard ELRS V2.0 receiver version. |
| ELRS firmware and radio frequency | ExpressLRS V2.0; 2.4GHz.Onboard ELRS V2.0 receiver version. |
| ELRS antenna and telemetry output | Enameled copper wire antenna; telemetry output power less than 12dBm.Onboard ELRS V2.0 receiver version. |
| ELRS protocol, compatibility and firmware limitation | SPI ExpressLRS; compatible with ExpressLRS V2.0 TX modules; ExpressLRS firmware cannot be flashed separately.Onboard ELRS V2.0 receiver version. |
| Receiver antenna length | 5cm.2.4GHz receiver antenna configuration since November 15, 2021. |
| FrSky receiver protocol and functions | SPI bus receiver; FrSky D8 compatible; compatible with non-EU transmitter D8 mode; 8 channels; failsafe support.Onboard FrSky SPI D8 receiver version. |
| FrSky receiver range | 200m–300m.FrSky SPI D8 receiver; no ground interference, with transmitter and receiver 1 m above the ground. |
| FlySky receiver protocols and channel counts | SPI bus receiver; switchable AFHDS and AFHDS-2A; 8 channels with AFHDS or 14 channels with AFHDS-2A.Discontinued FlySky SPI receiver variant. |
| FlySky receiver range and failsafe | 200–300m; failsafe support.Discontinued FlySky SPI receiver variant; range specified without ground interference, with transmitter and receiver 1 m above the ground. |
| Video transmitter firmware and control | 5.8GHz OPENVTX; OPENVTX firmware; SmartAudio v2.1; PIT and RCE modes; 48 channels.Onboard 5.8GHz OPENVTX. |
| Video transmitter output settings | 0/RCE/25mW/100mW/400mW.Onboard OPENVTX. |
| Video transmitter electrical requirements | DC 5V supply; current less than 650mA at 400mW.Onboard OPENVTX; current at 5V with 400mW output. |
| Integrated video transmitter revision | Built-in OPENVTX supporting maximum 400mW output.DiamondF4FR V3.2 configuration. |
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