Spider-Man Web Shooters

flux

I’ll resume from the preserved routing state, fix any reported boundary or USB-C anomalies, and run the final connectivity and DRC checks.

flux

The prior routing job no longer exists, so I’m starting a fresh pass. The only preflight warnings are the USB-C connector’s own shield/GND pads inside its footprint keepouts; the router explicitly ignores those local keepouts, so no placement change is needed.

flux

A fresh routing job was started and preserved as auto-layout-3402e732-f0c9-4eac-9443-2011ebf33390, but paused because no ACUs remain. The board currently has 78 airwires, plus USB-C keepout warnings and one board-boundary placement error; after adding ACUs, resume this job, resolve the boundary issue, then complete routing and final DRC.
M

mahesza

proceed

flux

The saved routing job has expired, so I’m starting a new full-board route from the existing placement and neckdowns. The remaining preflight warnings are limited to USB-C shield/ground pads within their own footprint keepouts.

flux

A new routing job was created and preserved as auto-layout-5ab1a155-8eb2-4ce1-a495-1f8df4b1f161, but paused because no ACUs remain.
Remaining
  • Add ACUs and resume this job.
  • Resolve one board-boundary placement error.
  • Review six USB-C shield/GND footprint-keepout warnings.
  • Complete routing and verify zero airwires and blocking DRC errors.
Review board-boundary error
Inspect USB-C warnings
Prepare routing constraints
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Files

Schematic

Layout

3D View

Project Specification
Product goal
Create an Amazing Spider-Man-inspired wrist-mounted web-shooter prototype that preserves the slim visual profile, fits beneath a sleeve, detects the classic hand gesture on a bare hand, and launches a harmless tethered tip.
First prototype scope
  • One wearable wrist unit.
  • Target launch distance: 1–2 m.
  • Low-energy spring-release launcher; no compressed gas, combustion, pyrotechnics, or rigid/high-mass projectile.
  • Soft, lightweight tether tip and lightweight line.
  • Gesture detection using low-profile magnetic finger bands and wrist/palm magnetic sensors.
  • Electronic controller validates the gesture and releases the launcher through a small actuator.
  • Manual arming control plus electronic lockout against accidental or repeated firing.
  • Retraction is separately commanded and torque/current limited; it must not automatically pull objects toward the wearer.
  • Rechargeable low-profile battery with protected charging.
Industrial design constraints
  • Slim enough to conceal under a normal loose sleeve.
  • Styling inspired by The Amazing Spider-Man mechanical web shooters: metallic technical appearance, narrow wrist silhouette, and a front-facing nozzle.
  • Electronics, battery, and tether spool distributed along the forearm rather than stacked vertically.
  • Bare-hand finger bands should be discreet; a matching glove may be added later.
Safety requirements
  • Intended only as a cosplay/engineering prototype, not climbing, restraint, self-defense, or load-bearing equipment.
  • Soft tip, breakaway tether, low stored energy, and no aiming at faces, people, animals, traffic, or fragile objects.
  • Launcher cannot fire unless armed and the complete gesture persists for a short validation interval.
  • Immediate physical disarm control accessible to the wearer.
  • Tether system must avoid finger, hair, and clothing pinch hazards.
Functional sequence
  1. User loads the soft tether tip and mechanically latches the low-energy launcher.
  2. User deliberately arms the device.
  3. Wrist sensors recognize the configured two-finger gesture.
  4. Controller confirms the gesture and releases the latch once.
  5. Tether pays out freely to the limited 1–2 m length.
  6. User activates a separate control for slow, torque-limited retraction.
First-build architecture
  • Small low-power microcontroller.
  • Two Hall-effect or magnetic proximity sensing channels.
  • Servo, solenoid, or shape-memory actuator selected after mechanical force testing.
  • Protected single-cell rechargeable battery.
  • Motor driver and current sensing only if powered retraction fits the thickness and safety targets.
  • Status indication kept subtle to preserve aesthetics.
Validation criteria
  • Recognizes the intended bare-hand gesture reliably without triggering during ordinary wrist movement.
  • Cannot launch while disarmed.
  • Tip energy remains harmless in close-range testing and launch distance does not exceed the configured limit.
  • Tether breaks away or releases before creating hazardous wrist loading.
  • Enclosure fits beneath the selected sleeve and has no exposed pinch points or sharp edges.
  • At least 50 bench firing cycles without latch, line, actuator, or battery faults.
Deferred work
  • Spider-Man glove integration.
  • Final cosmetic enclosure and finishing.
  • Longer range, adhesion, load-bearing, swinging, or human/object pulling are explicitly outside scope.
Electronics proof-of-concept implementation
  • Status: Schematic review complete.
  • USB-C charging-only input with independent 5.1 kΩ CC sink resistors, 500 mA PPTC, and 5 V TVS.
  • MCP73831 single-cell charger programmed to approximately 303 mA with a subtle charge LED.
  • Protected 1-cell LiPo connector; charger stays connected to the cell while operating loads are isolated.
  • AO3401A P-channel master load-isolation MOSFET controlled by a low-current accessible slide switch.
  • TPS63031 fixed 3.3 V buck-boost regulator so the logic rail remains regulated across the 3.0–4.2 V cell range.
  • STM32G030F6 MCU with SWD header, reset support, status LED, two separate Hall inputs, ARM input, RETRACT input, launcher output, and three motor-driver controls.
  • Two board-mounted DRV5032AJ omnipolar Hall switches with individual open-drain pull-ups.
  • AO3400A low-side launcher driver with 100 Ω gate resistor, 100 kΩ gate pull-down, SS34FA flyback diode, and external actuator connector.
  • DRV8837 bidirectional motor driver with separate MCU controls, default sleep behavior, 100 nF local bypassing, 220 µF local bulk, and external motor connector.
  • USB_PRESENT divider allows firmware to inhibit actuation while USB is attached.
Electronics power budget

Table

PathDesign value
3.3 V logic peak50 mA
Logic reflected to 3.0 V battery at 85% assumed efficiency~65 mA
Actuator pulseup to 1.0 A
Retraction transientup to 1.0 A
Worst mutually exclusive battery event including logic~1.07 A
Battery connector/switching path targetat least 1.5 A transient
USB charge current~303 mA
Firmware safety requirements
  • Require both Hall channels active for a validation interval and require ARM active before launch.
  • Inhibit launch and retraction whenever USB_PRESENT is active.
  • Launch output is pulse-only with a strict maximum timeout.
  • Retraction requires a separate button command.
  • Never command the launcher and retraction motor simultaneously.
  • Configure launch, motor IN1/IN2, and motor sleep controls low during reset/boot initialization.
Electronics assumptions
  • The LiPo pack includes overcharge, over-discharge, and overcurrent protection.
  • The external low-energy latch actuator and motor are rated for direct 1-cell operation and do not exceed 1.0 A transient.
  • PCB layout will use wide, short high-current paths and adequate copper around the power MOSFETs and motor driver.
  • Larger 220 µF and 470 µF capacitors are accepted where transient energy storage requires packages larger than 0603.

  • Product goal

  • First prototype scope

  • Industrial design constraints

  • Safety requirements

  • Functional sequence

  • First-build architecture

  • Validation criteria

  • Deferred work

  • Electronics proof-of-concept implementation

  • Electronics power budget

  • Firmware safety requirements

  • Electronics assumptions