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

On this put up, 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 might 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. Contemplate this a mini-review.

A few of the hyperlinks on this web page are affiliate hyperlinks. I obtain a fee (at no additional price to you) when you make a purchase order after clicking on one in every of these affiliate hyperlinks. This helps help the free content material for the neighborhood on this web site. Please learn our Affiliate Hyperlink Coverage for extra info.

Be taught extra about flight controllers in my purchaser’s information: https://oscarliang.com/flight-controller/

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 resolution.

Affords 6 UARTs! Usually, whoop/toothpick type FCs solely offer you 2 UARTs, which may be very limiting. With this many UARTs, you possibly can actually apply it to any construct.
A number of 4.5V pads, which I exploit 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 should not have this function.

SDA and SCL (i2c) connections let you join a compass. Once more, this function is normally lacking in such a board!
Onboard barometer!
Affords 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 facility.

What I don’t like about this FC:

The most important draw back of this FC might be the absence of the OSD chip for analog (AT7456E). The brand new V2 is designed for HD methods, similar to Walksnail, HDZero, and DJI, which don’t want this chip to show OSD within the goggles like analog does. I assume analog is turning into much less fashionable, and this modification lowers the price of manufacturing as nicely. You possibly can nonetheless use it with analog when you actually need to, however Betaflight OSD gained’t work.
I want there was an extra model with a horizontal USB port. This might help a wider vary of frames and make it extra versatile.

Total, I believe the GOKU F405 1-2S 12A AIO FC is without doubt 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, high 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
Dimension: 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 Charge: 500Hz
Minimal Receiver Refresh Charge: 25Hz

Serial: UART 1
Firmware: Flywoo EL24P 2400 RX
Model: 3.X.X

Specification	GOKU F405 HD 1-2S ELRS AIO V2	GOKU F405 1-2S 12A AIO ELRS
BF Firmware	FLYWOOF405S_AIO	FLYWOOF405S_AIO
BEC	5V 2A & 9V 2A	5V 2A
Flash	8MB	8MB
Onboard LED	2*WS2812	2*WS2812
Barometer	DPS310/SPL06	DPS310/SPL06
Gyro	ICM42688P / MPU6000	ICM42688P / MPU6000
Motor	M1-M4 OUTPUT	M1-M4 OUTPUT
i2c SCL/SDA	Sure	Sure
UARTs	1, 2, 3, 4, 5, 6	1, 2, 3, 4, 5, 6
Connector	USB Kind-C	Micro USB
Analog OSD	No	Sure (AT7456E)
Mounting	25.5*25.5mm	25.5*25.5mm
Dimension	30*30mm	30*30mm
Weight	4.9g	4.1g

Right here’s the pinout diagram.

3″ 2S Walksnail Toothpick Construct

Elements checklist:

At the moment, the lightest body I might discover is the Babytooth, but it surely’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 accessible 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 substitute.

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, but it surely works incredible on this construct. It has simply sufficient room to accommodate the USB port. Nevertheless, I do must take away the cover if I need 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.