Construct: 3-inch 2S Ultralight Drone utilizing Flywoo GOKU F405 HD 1-2S 12A AIO V2 FC

On this submit, I’ll share my 3″ Toothpick construct (a sub-100g micro FPV drone) utilizing the newest Flywoo GOKU F405 1-2S 12A AIO FC. This quad shall be utilizing the Walksnail FPV system and powered by 2S batteries. I can even share my ideas and expertise from utilizing the GOKU F405 12A AIO FC. Think about this a mini-review.

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My Expertise with the Flywoo GOKU F405 1-2S 12A AIO FC

Product Web page:

It comes with the next equipment.

Why I actually just like the Flywoo GOKU 1-2S 12A AIO FC:

• Constructed-in ExpressLRS 2.4GHz receiver (UART), making it a compact answer.
• Gives 6 UARTs! Usually, whoop/toothpick model FCs solely provide you with 2 UARTs, which could be very limiting. With this many UARTs, you’ll be able to actually apply it to any construct.
• A number of 4.5V pads, which I take advantage of for powering the receiver and GPS. This lets you energy these units by way of USB with out the necessity to plug within the battery, to keep away from overheating VTX.
• Has 8MB of flash reminiscence for Blackbox logging! That is helpful for tuning your quad. Most different 25.5×25.5mm FCs merely shouldn’t have this function.
• SDA and SCL (i2c) connections assist you to join a compass. Once more, this function is normally lacking in any such board!
• Onboard barometer!
• Gives each MPU6000 and ICM42688-P gyros.
• Has a 9V 2A BEC for powering your VTX!
• Helps iNAV!
• ESC’s have been flashed with Bluejay 0.19 24KHz in manufacturing unit.

What I don’t like about this FC:

• The largest draw back of this FC might be the absence of the OSD chip for analog (AT7456E). The brand new V2 is designed for HD programs, comparable to Walksnail, HDZero, and DJI, which don’t want this chip to show OSD within the goggles like analog does. I suppose analog is changing into much less well-liked, and this variation lowers the price of manufacturing as nicely. You’ll be able to nonetheless use it with analog in the event you actually wish to, however Betaflight OSD gained’t work.
• I want there was a further model with a horizontal USB port. This may assist a wider vary of frames and make it extra versatile.

General, I feel the GOKU F405 1-2S 12A AIO FC is likely one of the finest flight controller boards for 1S or 2S toothpicks and whoops, particularly for these digital FPV builds like Walksnail, DJI, and HDZero with its 9V BEC.

Right here’s a side-by-side comparability between the V1 and V2 of the GOKU 12A AIO FC.

Some close-ups of the flight controller, prime and backside.

Specs

• BF Flight Controller Firmware: FLYWOOF405S_AIO
• INAV Firmware: FLYWOOF405PRO
• MCU: STM32F405BGA
• BEC: 5V 2A / 9V 2A
• Flash: 8MB
• LED: 2 × WS2812
• Barometer: DPS310 / SPL06
• Gyro: ICM42688P / MPU6000
• Motor: M1-M4 OUTPUT I2C: SCL/SDA
• UARTs: 1, 2, 3, 4, 5, 6
• Connector: Kind-C
• OSD: No
• Gap: 25.5 × 25.5-3mm
• Measurement: 30 × 30mm
• Weight: 4.9g

Onboard 4-in-1 ESC

• Constructed-in 1S/2S 12A BL_S 4-in-1 ESC Helps Oneshot125, Oneshot42, Multishot, Dshot150, Dshot300, Dshot600
• Enter Voltage: 1-2S Lipo
• Firmware: BLHELI_S Bluejay 0.19 24KHz
• Firmware Model: Z_H_30_REV16.7

ELRS 2.4G RX (Non-obligatory)

• ESP8285 MCU
• SX1280IMLTRT RF Module
• Frequency Vary: 2400 MHz to 2500 MHz
• Most Obtain Refresh Price: 500Hz
• Minimal Receiver Refresh Price: 25Hz
• Serial: UART 1
• Firmware: Flywoo EL24P 2400 RX
• Model: 3.X.X

Right here’s the pinout diagram.

3″ 2S Walksnail Toothpick Construct

Elements record:

At the moment, the lightest body I might discover is the Babytooth, nevertheless it’s nearly by no means in inventory (I’m additionally fairly shocked it’s nonetheless not been cloned at this level). Additionally, it’s not designed for FCs with vertical USB ports, that are the most typical kind of FC. There aren’t many whoop-style FCs out there with horizontal USB ports, so I usually simply flip the board over and re-configure the board alignment in Betaflight. I get some new 3″ toothpick frames to check out within the subsequent couple of weeks, hopefully will discover a good alternative.

First, mount the motors.

Then, set up the Walksnail 1S VTX to the body and solder it to the FC. I’m powering it from the 5V pad on the FC because the 1S VTX solely helps 3.3V to 5V enter.

I additionally soldered a capacitor to the XT30 energy pads, which include the FC. I’m utilizing BetaFPV’s micro lite cover designed for tiny whoops, nevertheless it works implausible on this construct. It has simply sufficient room to accommodate the USB port. Nevertheless, I do must take away the cover if I wish to join the FC to Betaflight, which is barely annoying.

The construct weighs solely 59g excluding the battery, and with a 2S 550mAh battery, it weighs solely 88g. I can nonetheless make it lighter by:

• Shortening the motor wires and XT30 pigtail.
• Utilizing fewer zip ties.
• Not utilizing screws for mounting propellers (I solely have props with 2mm holes, and people motors have 1.5mm shafts, so I’ve to make use of screws for now).
• Utilizing a lighter cover.
• Utilizing a lighter battery mount.

Let me know when you have any questions within the feedback.