Product overview
The Happymodel Pancake 2-6S AIO F4 flight controller combines flight control, a radio receiver and video transmission in a 5.2g assembly. Its STM32F411CEU6 processor runs at 100MHZ with 512K FLASH, alongside an MPU6000 sensor connected over SPI. The controller accepts a 2-6S battery input and includes Betaflight OSD with SPI control. For stack integration, it offers 20×20 or 35.5×35.5 mounting formats and compatibility with 4-IN-1 ESCs in those formats. Its Betaflight firmware target is CRAZYBEEF4SX1280.
The onboard 2.4GHz SPI ExpressLRS receiver uses an SMD ceramic antenna and provides 50Hz, 150Hz, 250Hz and 500Hz packet rate options. It supports ExpressLRS v2.0 or latest and lists compatibility with V2.0 transmitter modules; its ExpressLRS firmware cannot be flashed separately. The integrated 5.8G OPENVTX provides 48 channels, SmartAudio v2.1, PIT and RCE modes, and 0/RCE/25mw/100mw/400mw power settings. Its antenna connection is U.FL. The video transmitter uses DC 5V and draws less than 650ma at 400mw.
Specifications
| Specification | Value & conditions |
|---|---|
| Manufacturer and model | Happymodel Pancake 2-6S AIO flight controller |
| Controller architecture | AIO F4 flight controller with built-in SPI ELRS 2.4G and 400mw OpenVTX |
| Weight | 5.2g |
| Compatible ESC mounting formats | 20×20 or 35.5×35.5 4-IN-1 ESC |
| Mount hole type | 20×20 or 35.5×35.5 |
| Betaflight firmware target | CRAZYBEEF4SX1280 |
| Microcontroller | STM32F411CEU6 (100MHZ, 512K FLASH) |
| Sensor | MPU6000 with SPI connection |
| Flight controller power supply | 2-6S battery input |
| On-screen display | Built-in Betaflight OSD with SPI control |
| Integrated receiver | Onboard SPI ExpressLRS 2.4GHz receiver |
| Receiver packet rate options | 50Hz/150Hz/250Hz/500Hz |
| ExpressLRS version support | ExpressLRS v2.0 or latest |
| Receiver RF frequency | 2.4GHz |
| Receiver antenna | SMD ceramic antenna |
| Telemetry output power | Less than 12dBm |
| Receiver protocol | SPI ExpressLRS |
| Transmitter module compatibility | ExpressLRS V2.0 TX Module |
| Receiver firmware flashing limitation | ExpressLRS firmware cannot be flashed separately |
| Integrated video transmitter and power range | Built-in 5.8G OpenVTX, 0mw~400mw |
| Video transmitter firmware | OPENVTX |
| Video transmitter control | SmartAudio v2.1 |
| PIT mode | Supported |
| RCE mode | Supported |
| Video transmitter channels | 48ch |
| Video transmitter power settings | 0/RCE/25mw/100mw/400mw |
| Video transmitter power supply | DC 5V |
| Video transmitter current | Less than 650maAt 5V and 400mw transmitting power. |
| Video transmitter antenna connector | U.FL |
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