Project Started

E

eamann

when can I finish it?

flux

You can continue as soon as your account has usable ACUs again—either when your plan’s allocation resets or after adding more through your Flux billing settings. I can’t see your reset date or billing details.
Once restored, finishing the design will still require:
  1. Adding support components and wiring the schematic.
  2. ERC and power-path verification.
  3. Your schematic approval.
  4. PCB outline/stackup, placement, routing, and DRC.
  5. Manufacturing-file export and final review.
Current state: 36 components, 0 nets, so the schematic is not yet electrically connected. Execution stopped because your ACUs ran out.
E

eamann

how many ACU will I need to finish the build?

flux

I can’t give a reliable numeric ACU estimate because Flux does not expose a fixed ACU cost per schematic edit, routing run, or executor task, and usage varies significantly with retries and verification.
This project is still early—36 components and 0 nets—so budget for several substantial work sessions covering:
  • Complete schematic wiring and support passives
  • Power-budget, datasheet, and ERC review
  • PCB placement and mechanical constraint work
  • Controlled-impedance USB/RF considerations
  • Routing, DRC remediation, and manufacturing exports
Check your plan’s ACU allowance and renewal date in billing. For an account-specific estimate or purchasing guidance, contact Flux support: https://docs.flux.ai/Introduction/getting-support. Execution remains stopped because your ACUs ran out.
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Schematic

Layout

Preview

Project Specification
Status: Draft / architecture review
Project Overview
Production-intent IJW Pro Quiz System wireless buzzer/slammer. The terminal communicates with a dedicated USB receiver over ESP-NOW and combines a round display, four slam-plate sensor switches, dual voice microphones, perimeter RGB lighting, replaceable 18650 power, and magnetic charging.
Intended Use
Premium commercially manufactured quiz-show terminal. Priorities: reliability, repeatability, serviceability, RF performance, audio quality, low-error assembly, and professional PCBA production.
What the Device Should Do
  • Communicate with the receiver using ESP-NOW.
  • Detect actuation through four corner pressure switches; enclosure hard stops absorb slam force.
  • Drive a 1.28-inch 240x240 GC9A01-compatible round SPI display.
  • Capture team-answer speech through matched west/east digital MEMS microphones.
  • Drive a continuous 5 V addressable perimeter RGB band.
  • Operate from a replaceable protected single 18650 cell.
  • Charge through a four-contact magnetic pogo input while the main system is off.
  • Support identification, pairing, firmware updates, factory programming, and production test.
Main Features
  • ESP32-S3-class module with external-antenna connection.
  • Four high-cycle-life PCB-mounted momentary switches.
  • Two factory-assembled I2S MEMS microphones.
  • Locking connectors for display, RGB band, charging harness, and any remote power switch.
  • Battery charging, protection, monitoring, thermal sensing, and power-path control.
  • Labelled pogo-accessible test points.
System Architecture
Diagram



  
    
  
  
    
  
































Magnetic 5 V charging input
ESD / reverse-current / input protection
Li-ion charger and power path
Replaceable 18650 + NTC
Cell protection
Main system power switch/load switch
3.3 V regulator
5 V RGB boost
ESP32-S3 module
Dual I2S microphones
Round SPI display interface
Four pressure switches
RGB level shifter
5 V perimeter RGB connector
U.FL external antenna
Hardware Subsystems
  1. Charging input protection and charger/power-path management.
  2. Replaceable-cell protection, current protection, NTC, and voltage measurement.
  3. Switched system power, low-noise 3.3 V rail, and high-current 5 V RGB boost rail.
  4. ESP32-S3 MCU/module, boot/reset network, native programming/debug pads, and external RF antenna.
  5. SPI display harness and backlight control.
  6. Matched dual I2S microphone channels with local filtering/decoupling.
  7. Four debounced/protected switch inputs.
  8. RGB level shifting, series damping, bulk capacitance, protection, and locking output connector.
  9. Factory test and programming pads.
Interfaces and Connections
  • Magnetic charge harness: four contacts allocated 2x +5 V and 2x GND.
  • Display: power, GND, SPI SCLK, MOSI, CS, D/C, reset, backlight control; exact harness pinout is pending the selected display assembly.
  • RGB: locking 3-pin +5 V / DATA / GND connector, designed for at least 1.5-2 A peak subject to final strip configuration.
  • Power switch: board-mounted or locking harness; charging remains active in OFF.
  • Antenna: short 50-ohm U.FL/IPEX pigtail to an enclosure-mounted 2.4 GHz antenna.
Power and Runtime Expectations
  • Source: single replaceable 18650 Li-ion cell.
  • Charging source: regulated 5 V magnetic pogo dock.
  • Charging must remain active indefinitely and while the main system is switched off.
  • Low quiescent current is important, but no runtime target has yet been supplied.
  • Software brightness limiting is allowed but electrical protection and component ratings must independently tolerate the defined peak envelope.
Power Tree and Preliminary Budget Basis
  • Protected cell/system node: approximately 3.0-4.2 V.
  • 3.3 V digital/audio rail: ESP32-S3, microphones, display logic, level shifter, monitoring.
  • 5 V boosted rail: perimeter RGB strip and display only if its selected assembly requires 5 V.
  • Design basis pending exact parts: 3.3 V rail >= 0.8 A peak; RGB output >= 2 A at 5 V. At a 3.0 V cell and 88% boost efficiency, a 10 W RGB peak alone implies about 3.8 A battery current, so the final LED count/brightness envelope is a critical architecture input.
Manufacturing and Assembly Expectations
  • Professional PCBA by PCBWay or similar.
  • Factory assembly of module, switches, MEMS microphones, power electronics, connectors, passives, protection, and test pads.
  • Keyed locking internal connectors; no Dupont-style connections or routine soldered flying leads.
  • Prefer documented, reputable, long-life components available from mainstream distribution/assembly channels.
  • Four-layer construction is expected to be preferable; final recommendation follows power/RF/audio analysis.
Firmware-Relevant Hardware Requirements
  • ESP-NOW, display SPI, dual-microphone I2S/PDM-compatible capture, RGB output, four switch inputs, battery ADC, charger status, pairing/ID, boot/reset, and factory programming/debug.
  • Avoid ESP32-S3 strapping and flash/PSRAM-reserved pins for attached loads.
Physical Design Expectations
  • Board: 95 mm x 95 mm square, sensible corner radii, no corner mounting holes, no north/south protrusions.
  • Coordinate origin at board centre; north +Y, east +X.
  • Strict central keep-out: 22 mm x 90 mm, centred at X=0/Y=0, representing the battery housing/structural spine.
  • Fixed switch centres: NW (-37.5,+37.5), NE (+37.5,+37.5), SW (-37.5,-37.5), SE (+37.5,-37.5) mm.
  • Two true internal 3 mm circular cut-outs on Y=0, mirrored east/west and halfway between the central structure and each outer edge. With the stated 22 mm spine as the inner datum, preliminary centres are X=+/-29.25 mm; this interpretation must be confirmed against enclosure CAD before committing.
  • Two microphones on Y=0, mirrored, each outward of its corresponding cut-out and inward of the PCB edge. Exact X coordinate depends on the selected microphone port/gasket geometry.
  • No component body may intrude into the central battery/support volume.
  • Preferred antenna zone: north edge, offset to one side of the central spine, with a defined all-layer RF keep-out and separation from switch hardware, microphones, battery conductors, and RGB power routing.
Important Design Decisions
  • Use a certified ESP32 module rather than a bare RF chip.
  • Use a unified ground system with careful placement and current-return control rather than split grounds.
  • Keep charging connected ahead of the main system power disconnect.
  • Use an external antenna and short pigtail because the central battery/support structure compromises an onboard antenna location.
  • Treat the RGB peak current as a system-level constraint, not merely a connector rating.
Assumptions and Open Interfaces
  • Final LED type, LED count, maximum commanded brightness, and desired runtime are not yet fixed.
  • Exact display module/harness pinout and mounting geometry are not yet fixed.
  • Magnetic pogo connector/harness part and mating geometry are not yet fixed.
  • Power-switch mechanical format and harness/board-mount choice are not yet fixed.
  • Enclosure material, antenna mounting method, and available RF clearance are not yet fixed.
  • The 3 mm cut-out midpoint calculation uses the 22 mm battery-spine side as the inner boundary; central display-support diameter may alter this datum.
  • Exact switch actuator height/travel and microphone acoustic gasket geometry require enclosure coordination before final footprint commitment.
Success Criteria for the Current Phase
  • Functional architecture and exact part recommendations documented.
  • Preliminary power/thermal budget completed.
  • Preliminary schematic and BOM completed and reviewed.
  • Fixed board geometry/keep-outs captured without guessing unresolved mating dimensions.
  • ERC/design review completed before requesting approval to begin PCB placement.
Change Notes
  • Initial specification transcribed from the supplied product requirements on 2026-08-25.

  • Project Overview

  • Intended Use

  • What the Device Should Do

  • Main Features

  • System Architecture

  • Hardware Subsystems

  • Interfaces and Connections

  • Power and Runtime Expectations

  • Power Tree and Preliminary Budget Basis

  • Manufacturing and Assembly Expectations

  • Firmware-Relevant Hardware Requirements

  • Physical Design Expectations

  • Important Design Decisions

  • Assumptions and Open Interfaces

  • Success Criteria for the Current Phase

  • Change Notes