Getting Started with Flux

Worked for 8 mins 55 sec
Thought for 12 sec
Referenced guidance.
Thought for 8 sec
1/3 Complete a documented, independently wired FC prototype schematic with a verified firmware path.

Complete a documented, independently wired FC prototype schematic with a verified firmware path.

Establish an accessible separate ESC project and documented open-firmware architecture.

Review completed schematics and identify remaining geometry and physical-validation gates before layout.

Thought for 18 sec
Thought for 19 sec
Created a project
Four-Channel Open-Firmware ESC Prototype
Separate compatible-prototype ESC for F405 FC; open firmware architecture, target 3–6S and 55A per channel subject to source-backed design and physical validation. 30.5mm mounting; original 40.9x44.9mm published envelope includes heatsink, bare-board geometry unverified. Independent harness, not an exact SpeedyBee/OX32 clone.
Thought for 23 sec
Awaiting 1 task
Created a thread
Open-firmware four-channel ESC
Starting...
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"F405 Schematic Audit" completed.

flux

FC ma 15 kharekhar unused pins ni cleanup kari chhe, jethi ERC errors 44 thi 29 thaya; power ane external interfaces haju pura nathi. Tamara account ma alag ESC project banavyo chhe, ane documented open-firmware architecture verify kari rahyo chhu.
Thought for 33 mins 33 sec
Thought for 10 sec
Awaiting 1 task
"Four-Channel ESC Prototype" completed.

flux

Hu exact copy na badle documented compatible prototype no marg pasand karyo chhe, pan banne boards haju adhura chhe.
  • FC: 15 kharekhar unused MCU pins ne NC mark karya; ERC errors 44 thi 29 thaya. Haju 36 components ane 27 nets chhe—power selection, motor/UART interfaces, sensing ane firmware compatibility puri nathi. Firmware Getting Started ane Board Bring-Up Plan save karya chhe, pan aa verified working firmware nathi.
  • ESC: tamara account ma alag ESC project banavyo. Tenu final build result inspect kari shakyo nathi, etle components, wiring ke working ESC complete thayanu confirm karto nathi.
Baki: FC schematic completion, ESC firmware/power-stage verification, 39 × 39mm FC layout, ESC bare-board geometry, placement/routing ane physical load/thermal tests. Koi board manufacturing-ready nathi; 55A capability verify thayeli nathi.
Tamara ACUs pura thai gaya, etle execution ahi rokayu.

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Schematic

Layout

3D View

Schematic is Auto-placed

The schematic has been arranged automatically. Flux can redraw it to be more readable, with components placed in related groups and wires drawn more legibly. This takes about 10-60 mins.

Project Specification
Active Prototype Scope — supersedes historical requirements below
2026-10-07: user authorized an independently documented compatible prototype, not an exact original clone. Active FC is /rahiba1836/f405-flight-controller-prototype . Keep intended FC39x39mm and30.5mm mounting spacing; side-notch geometry remains pending. No ESC edits or PCB placement/routing are authorized in this schematic phase.
First prototype includes F405/ICM42688/16MB flash, four DShot outputs, UART1 receiver/UART2 GPS, useful expansion UARTs, I2C, SWD/reset/boot and sensing-only VBAT plus protected current/telemetry. OSD, barometer, wireless/app integration, camera control, LEDs, buzzer, servos, RSSI and switched auxiliary BECs are omitted. External regulated5V BEC is required; implement anti-backfeed selection with USB before adding an external power input. Do not connect battery to AP2112 or MCU. No9V BEC, original connector-number compatibility, auxiliary-current rating,55A performance or flight/manufacturing-readiness claims. Choose an independent connector map only after real connector/pin/rating evidence is available.
Actual state remains36 components/27 nets, USB-only powered support core. Commit dde5c975 marked15 truly omitted MCU pins NC: PC13,PC14,PC15,PC0,PC2,PC3,PB12,PB13,PB14,PC8,PC9,PA8,PA15,PB8,PB9. Desired motor/UART/I2C/current/VBAT pins remain available, not suppressed. Final read-only ERC:29 errors/0 warnings, down from44:19 desired-interface floating pins,2 IMU missing-power inference reports and8 USB external-source reports. No component or net was added/removed and no power-path change occurred.
Execution blocker: available schematic namespace exposes component/property/pin/net edits but no mutate_schematic_arrangement or visual-wire editing tool. This blocks required arrange-before-wire drafting of new support and interface blocks; arbitrary component coordinates cannot be supplied by mutate_components either. Terminal Pin Type config applies only to Terminal, not Component; no direct terminal-property mutation is exposed. Attempt to inspect exact AP2112 published-version pin metadata with get_symbol failed because the component partVersion was not found in part-project history. No retries or fabricated pin-type corrections were made.
Clock direction: retain active8MHz Y1 and require explicit HSE-bypass configuration in custom prototype firmware; stock-target compatibility is NOT established. Previously read Betaflight source resets HSEBYP. Raw-source web fallback reported source unread (search context is not verification), so it cannot be used as proof of final SetSysClock behavior. Custom clock implementation/build and hardware startup validation remain blocked/unattempted, not completed.
Historical2.5A accessory BEC envelopes and original UART assignments below are no longer active design requirements. Existing core-power-budget remains a bounded USB-only screening analysis; external peripheral budget, anti-backfeed path, sense circuits and analog simulation have not been implemented. Firmware and bring-up files record present support nets and hold gates, not a claim of a completed schematic.
Project Overview
Status: Review — source/primary-part checkpoint, NOT a complete schematic or verified clone. Develop one new compatible prototype FC referenced to SpeedyBee F405 V5, separate from the ESC. Current FC: /setej72878/f405-fc-and-55a-esc-prototype . ESC: /setej72878/four-channel-55a-esc-prototype . Do not mutate ESC from this task.
Intended Use
Bench development and eventual multirotor integration after electrical, firmware and assembled-board tests. No flight or production readiness claim. Remove propellers for every bring-up test.
What the Device Should Do
Read inertial and pressure sensors, run flight-control firmware, log blackbox data, exchange receiver/GPS/VTX/telemetry data, and provide four motor and two servo signals. Supply external accessories from battery and allow receiver/GPS operation from USB without backfeeding either source.
Main Features
Reference targets: STM32F405, ICM42688P, SPA06-003, AT7456E, 16MB blackbox, USB-C, six UART roles, SWD/reset/boot, camera/video, buzzer, LEDs, receiver, GPS/compass and HD VTX. Proprietary Bluetooth/app activation and wireless flashing are not established and are deferred, not emulated.
Mechanical System Architecture
Text
39x39mm FC -- stack spacers / signal harness -- separate ESC
                                               heatsink + motors
Original unequal dimensions explicitly approved. FC reference height4.9mm; mounting spacing30.5x30.5mm, diameter4mm side-open holes. ESC envelope40.9x44.9x8mm includes heatsink, not verified bare PCB. No enclosure is in scope. Notch geometry, exact pad coordinates and mating connector numbering are unresolved; no board outline or holes authored.
Electrical System Architecture
Text
3–6S VBAT -> protection -> 5V / 9V BEC -> accessories
USB VBUS -> reverse-blocking source selection -> logic and distinct 4.5V RX/GPS
logic supply -> 3V3 MCU/flash; quiet independent IMU rail
STM32F405 -> SPI1 IMU; SPI3 flash; UARTs; four motor signals
          -> USB, SWD, ADC sense, I2C barometer/compass, OSD
Power tree is proposed, not wired. Never tie USB VBUS directly to battery-derived5V.
Hardware Subsystems
  • Compute: sourced U1 STM32F405RGT6; supply, VCAP, reset, boot, clock and debug support still unconnected. Library search metadata says32-LQFP despite64 terminals and description64-LQFP: footprint must be checked before acceptance for manufacture.
  • IMU: sourced U2 ICM-42688-P. Reserved pin7 must go toGND;2,3,10,11 may be NC orGND. VDD bypass100nF and2.2uF, VDDIO10nF X7R per extracted application data. Quiet rail not designed yet.
  • Storage: U3 W25Q128JVSIM TR 128Mbit (=16MB), candidate single-SPI blackbox. Supply3.0–3.6V supports133MHz condition. WP and HOLD must be kept inactive for single-SPI use; JEDEC/driver compatibility pending.
  • MCU decoupling:100nF per VDD pair plus4.7uF bulk, VDDA100nF+1uF. Each VCAP requires2.2uF, ESR<2ohm; never attach VCAP to3V3. NRST recommended100nF to ground; internal pull-up exists.
  • Pressure: SPA06-003 exact library query returned no match; unavailable named part is not silently substituted. Public manual also mentionsSPA06-001: suffix discrepancy remains open.
  • OSD: AT7456E library candidate found, not added; pin/supply/3V3-control and video application evidence still needed.
  • Power and protection: all regulators, source selection and sensing deferred pending complete per-load budget and datasheets.
Interfaces and Connections
External roles intended: UART1 Bluetooth (deferred);UART2 receiver;UART3 HD VTX;UART4 GPS;UART5 RX ESC telemetry;UART6 alternate receiver. CompassI2C; camera/video; buzzer;LED;RSSI;servoS5/S6. Exact connector pin order is not established. Public Betaflight Support Explorer https://support.betaflight.com/targets/SPEEDYBEEF405V5 provided reference mappings: motorsPB1/PB0/PB10/PB11;UART1PA9/PA10;UART2PA2/PA3;UART3PC10/PC11;UART4PA0/PA1;UART5RX PD2;UART6PC6/PC7. GyroSPI1 PA5SCK/PA6MISO/PA7MOSI,PA4CS,PC4EXTI,PB15CLKIN. FlashSPI3 PB3SCK/PB4MISO/PB5MOSI,PC12CS. SYSTEM_HSE_MHZ8. These are SOURCE REQUIREMENTS, not actual wired pins at this checkpoint. Exact MCU alternate functions/control levels and gyroCLKIN implementation must be checked before wiring. Raw GitHub URL returned404; pin map must be archived to a stable revision before compatibility release. Manual identifies eight solder functions M4/M3/M2/M1/TLM/current/GND/VBAT but NOT a verified ten-contact map. No guessed ten-pin connector added. Independent named solder interfaces may proceed after electrical verification.
Power and Runtime Expectations
3–6S input,25.2V fully charged6S. Depleted-input planning assumption9V (3V/cell), subject to battery cutoff requirement. No charging on FC. No runtime target given. Input transients from ESC must be characterized;25.2V-only ratings are insufficient.
Power Tree and Power Budget
Manufacturer target is2.5A TOTAL5V and2.5A9V, not per pad. Distinct4.5V receiver/GPS rail target behavior includes USB power. External actual loads remain unspecified.

Table

RailPlanned consumersBudget status
5Vcamera,buzzer,LED strips,servo supply and internal logic conversion12.5W total reference envelope; allocation/servo stall peaks unresolved
9VHD/analog VTX22.5W total reference envelope; VTX burst/startup unresolved
3V3MCU,flash,IMU,barometer,pullupsTypical and peak currents not yet extracted; no regulator selected
4.5Vreceiver,GPSUSB enumeration/current limits and exact load peaks unresolved; not equivalent to5V
Full two-BEC envelope35W; at assumed85% efficiency and9V minimum battery, reflected input35/(9*0.85)=4.58A before any loads not included in the5V envelope. At25.2V this is1.63A. These are planning calculations, NOT verified consumption or regulator capability. Do not double-count internal logic if included within2.5A5V total; if user needs2.5A external5V PLUS logic, increase budget. Complete per-consumer idle/typical/peak table before selecting every power-path part. USB-only mode must disable9V/5V high-power accessories and budget enumeration/startup receiver/GPS loads. Transient amplitude/duration, fuse derating, protection clamp and capacitor DC-bias/ripple/thermal calculations remain open.
Manufacturing and Assembly Expectations
Compact SMD prototype; layer count and fab not selected. No silent named-silicon substitutions. MCU package/footprint quality must be verified. No manufacturing exports; no layout placement/routing in this pass.
Firmware-Relevant Hardware Requirements
Advertised reference targetSPEEDYBEEF405V5 is not yet proven reusable. Until all mappings,8MHz clock,IMU clock/alignment, flash and barometer drivers, power controls, sense calibration and defaults match, a NEW prototype target is required. Never reuse current-meter scale36 for a new sensor without measured transfer calibration. Boot/DFU andSWD are intended but not wired. Firmware Getting Started and Board Bring-Up files are deferred until actual wired circuits exist; no misleading init examples for unconnected pins.
Physical Design Expectations
FC39x39mm approved; reference4.9mm assembly height is not a guaranteed prototype component-height limit. Preserve mounting spacing only once authoritative side-opening geometry is available. Original pad coordinates/silk cannot be recovered precisely from image-only manual. Mechanical work held for later phase.
Important Design Decisions
Separate unequal-size projects; new compatible prototype, not verified clone. Primary ICs added early from library; no guessed ten-pin harness. Proprietary radio/app excluded pending evidence. No regulator selection before full budget.
Assumptions
9V low battery and85% conversion efficiency are conservative planning assumptions, not datasheet claims. No backup battery planned. Reference page specs are commercial targets, not demonstrated board performance.
Change Notes
2026-10-07: resolved equal-size conflict, renamedFC, updated description/link; added3 primaryICs. Source-backed support facts and public pin map collected. Schematic positioning tool mutate_schematic_arrangement is not exposed in available namespaces despite skill requiring arrange-before-wire: this specifically blocks drafting and subsequent wiring under current procedure. NoPCB mutations made.
Checkpoint and Blockers
Completed: identity, approved size resolution, separate-project link, specification, reference review update, primary sourcing/addition and initial datasheet extraction. Read-only schematic inspection confirms3 components and0 nets. ERC reports95 ERRORS:86 floating pins and9 missing-power findings; these are genuine incomplete-circuit errors, not accepted false positives. No coherent block is electrically completed. Analog simulation not run. Failed/blocked: coherent wired MCU/clock/reset/boot/SWD/USB,IMU and flash blocks — required schematic arrangement tool unavailable. Power — full per-load peak facts/source path not finished; no regulator chosen. Barometer — named part missing. OSD and remaining interfaces — unattempted beyond candidate/source research. Connector — authoritative ten-pin numbering absent. Analog/power simulation — unattempted, no analog circuit built. No production/flight readiness.

  • Active Prototype Scope — supersedes historical requirements below

  • Project Overview

  • Intended Use

  • What the Device Should Do

  • Main Features

  • Mechanical System Architecture

  • Electrical System Architecture

  • Hardware Subsystems

  • Interfaces and Connections

  • Power and Runtime Expectations

  • Power Tree and Power Budget

  • Manufacturing and Assembly Expectations

  • Firmware-Relevant Hardware Requirements

  • Physical Design Expectations

  • Important Design Decisions

  • Assumptions

  • Change Notes

  • Checkpoint and Blockers