Happymodel CruxF405 HD AIO Flight Controller 3-4S 20A ESC-UART ELRS 2.4GHz- 20x20mm
SKU: 74950844333

Happymodel CruxF405 HD AIO Flight Controller 3-4S 20A ESC-UART ELRS 2.4GHz- 20x20mm

$66.59 $73.99
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Description

Happymodel CruxF405 HD AIO Flight Controller 3-4S 20A ESC-UART ELRS 2.4GHz- 20x20mmThe CruxF405HD ELRS AIO flight controller comes with integrated UART 2. 4GHz ExpressLRS receiver and 20A Blheli_s ESC(Bluejay firmware pre installed) which could support 3 4s battery. Bigger Mosfet could support high to 20A currents would be better for 3 4S toothpick drone or long range FPV drone. Reserved 6 pin socket for DJI HD equipment plug and play. Its a great solution of build HD digital FPV drone . No longer supports 2S, only 3S 4S. Check out

The CruxF405HD ELRS AIO flight controller comes with integrated UART 2.4GHz ExpressLRS receiver and 20A Blheli_s ESC(Bluejay firmware pre-installed) which could support 3-4s battery. Bigger Mosfet could support high to 20A currents would be better for 3-4S toothpick drone or long range FPV drone. Reserved 6 pin socket for DJI HD equipment plug and play. It’s a great solution of build HD digital FPV drone .

No longer supports 2S, only 3S-4S.

Check out all our Flight Controllers and the rest of our HappyModel Products!

SPECIFICATIONS:

Flight controller

  • MCU: STM32F405RGT6 (168MHZ, 1Mbyte FLASH)
  • GYRO Sensor: ICM42688  (SPI connection)
  • Mount hole size: 20mm*20mm
  • Power supply: 3~4S battery input (DC 8.7V-17.4V)
  • Built-in 20A(each) Blheli_S 4in1 ESC
  • Built-in Serial ExpressLRS 2.4G (Default connected to UART2)
  • Built-in BMP280 Barometer
  • Built-in 8MBp blackbox
  • Built-in voltage meter sensor , voltage meter scale 110
  • Built-in current meter sensor , current meter scale 470
  • Flight controller firmware target: BETAFLIGHTF4

Onboard 4in1 ESC

  • MCU upgraded to EFM8BB21
  • Power supply: 3-4S LiPo/LiPo HV (7v/17v)
  • Currents: 20A continuous peak 25A (5 seconds)
  • Support BLHeliSuite programmable
  • Factory firmware: Bluejay 0.19.2
  • Firmware target: F_H_40_48_v0.19.2
  • Default protocol: DSHOT150/DSHOT300/DSHOT600

Onboard UART ExpressLRS 2.4GHz Receiver

  • Packet Rate option: 25Hz/50Hz/150Hz/250Hz/500Hz
  • RF Frequency: 2.4GHz
  • Antenna 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:

  1. Supply power to the flight controller by plug USB, wait until the red 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 red LED light will start to double-flash, which means that the Receiver enters the binding mode
  2. 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 red LED should blinking slowly first then turn to solid, that means binding was successfully. If the red led keep tri-flash after binding ,please change Model Match tab value from “off” to “on” or from “on” to “off”

Receiver LED status meanings:

Red LED solid means bind successful or RC link established; Red LED double-flash means get into bind mode; Red LED flash slowly means no RC signal input from TX module; Red LED continuous flash fast means ExpressLRS wifi enabled; Red LED tri-flash means model mismatch need to change model match from “off” to “on”.

UART description:
ELRS receiver was connected to UART2 default out of factory.
Usually UART1 or UART6 Could be used for MSP OSD with HD VTX.
UART6 could be used for GPS or other serial equipment.
IRX6 is an inverted serial RX6 for SBUS input.
IRX6 and TX6/RX6 couldn’t be used at the same time.

NOTES:

If upgrade firmware to betaflight 4.4.x , need to add custom Defines “GYRO_SPI_ICM42688P ACC_SPI_ICM42688P” from build configuration of betaflight configurator otherwise gyro will not working . 

If you want to enable Barometer , please connect to betaflight configurator and go to CLI command ,then type the following command:

resource I2C_SCL 2 B10
resource I2C_SDA 2 B11
set baro_bustype = I2C
set baro_i2c_device = 2
save


Package Includes:

  • 1x Happymodel CruxF405 HD AIO Flight Controller 2-4S 20A ESC-UART ELRS 2.4GHz- 20x20mm


Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 74950844333

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New York, US
★★★★★ 5
Cool Texture, Great Product, Notable Cons, Still Recommend
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AMAZING PRODUCT! I've never used a "paper-like" screen protector, but this one applied perfectly and was easy to use! (just follow the instructions!) no bubbles, just one single speck of dust (my own fault - sigh). It creates a very strong "matte" effect and feels cool to run your hand over (very paper-y) CONS: -The fit was SLIGHTLY big for my new S11 tablet, (each corner went RIGHT to the very corner of the tablet ALMOST going over the lip-this was just the corners of the protector and not the edges, which I found weird. IMO, its too close for my own comfort, but it still works none the less, and I've managed to use a case with it too with only minor corner lift). -The texture of the screen protector definitely distorts the pixels slightly, its just something to get used to, and probably something you'd have to see yourself, for if it would bug you or not. -It collects fingerprints like craaazy but they also wipe off craaazy easy too....sooo not fully an issue? just surprised me. Overall, for the money, I still recommend getting this protector if you're at all interested in a "paper-like" finish!
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Reviewed in the United States on May 10, 2026
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Therese Wagner
Chelsea, US
★★★★★ 5
Great quality and easy to apply
Model: iPad A16 11th/10th/Air 11
I love these screen protectors. They feel amazing and they sent an installation kit making the applying process so easy. There was also a squeegee included to make sure air bubbles wouldn’t Be a problem. I’ve had zero problems with the protector reducing the touch sensitivity of the screen, the protectors fit well, seem durable, and are great quality. The price was also reasonable. I’ve never owned other paper-feel screen protectors so I’m not able to give a comparison, but for these being my first ones I am very pleased.
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Reviewed in the United States on April 23, 2026
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Loren Flores Morales
Lexington, US
★★★★★ 5
Get this if you draw, write, play touch games
Model: iPad Pro 11,iPad Air 5th/4th
The quality of the screen protector is great, easy to put on without the video. i love how it really feels like writing on paper with my pen especially drawing. I will definitely be buying more for myself,mother and siblings. It’s a good fit for my iPad Air 4th gen and a bang for the buck
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Reviewed in the United States on May 25, 2026
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Jorge L.
Cuba, US
★★★★★ 4
Good but Installation was a Bit Iffy
Model: iPad A16 11th/10th/Air 11
90% of the time I use my iPad for school. Originally, I used just a regular screen protector, but it would get dirty with smudges and imprints from my Apple Pencil, and there would be a lot of glare since I'm in a classroom most of the time, which would make it awkward to see what I was writing at times. Plus, the screen protector was too smooth so it would actually be difficult to write legibly. This product makes it a lot easier to write smoother on the iPad. I only just installed it, so I can't say much on the smear protection yet, but I can already see the reduction in glare as well. For $8, getting a pack of two of these with an install kit is a very nice deal imo. My only issue was the installation process, which could've been as much my own fault tbh, but I felt like I aligned the screen protector pretty well with the sticker, however the first time I tried installing it it was way off the center (maybe my case got in the way?). The biggest issue was using the squeegee to pop air bubbles, and this is something they don't mention in neither their instruction guide nor video, but you're supposed to used the velvet red side, not the naked white side: using the white side actually takes the grit off the protector, which is obviously something you don't want on a product that relies on it. Thankfully I have another one in reserve in case this one wears off sooner than expected.
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Reviewed in the United States on October 7, 2025
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Breanna
Lexington, US
★★★★★ 5
Perfect Paperlike substitute
Model: iPad Air/Pro 13
I’ve been using this screen for roughly two months now and I can say it was so worth it, it is rough on plastic nibs! I am going to order some heavier duty ones and see how it fairs! It works just fine ON TOP of a screen protector isn’t that great! I wanted something like paper like but didn’t want to pay that expensive price for something I wasn’t sure I was going to like. This one does the trick and gives me just enough resistance to feel more in control of my pen! It fits well just make sure to know the size if your screen I had to modify where the camera indent was but it cut just fine and looks great!
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Reviewed in the United States on May 24, 2026

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