Haptic Glove Design Discussion

Thought for 2 sec

I can’t analyze or run auto-layout right now because the account currently has no available ACUs, so AI execution features are unavailable.

What has been accomplished so far:

Complete schematic was created for the ESP32 haptic glove.
ERC was clean at the last schematic check.
PCB setup was started with an 80 × 90 mm, 4-layer wearable board.
Major components were placed by functional block, including ESP32-S3, USB-C, LiPo JST connector, charger, regulator, DRV2605L, TCS34725 connector, LRA connector, buttons, and passives.

What remains:

Inspect current PCB state to determine whether placement, routing, or both are still needed.
Complete routing, including USB D+/D−, battery/SYS/3V3, I2C, and LRA outputs.
Run DRC/board checks and fix remaining issues.
Verify ESP32 antenna keepout, connector accessibility, and wearable mechanical constraints.

Once ACUs are available, I can run the PCB analysis and automatically apply the needed placement/routing updates.

namj6280

Start Auto-Layout

Thought for 1 sec

flux

I can’t run PCB analysis or auto-layout right now because the account currently has no available ACUs, so AI execution features are unavailable.

Current project state from the last completed work:

Schematic is complete for the ESP32 haptic glove.
ERC was clean at the last check.
PCB was initialized as an 80 × 90 mm, 4-layer board.
Major parts were already placed by functional block.
Routing is still incomplete, with airwires remaining.

What still needs to be done:

Inspect the current PCB to decide whether placement refinement, routing, or both are required.
Auto-route key nets: USB D+/D−, battery/SYS/3V3, I2C, and LRA motor outputs.
Run DRC/board checks after routing.
Fix clearance, unrouted-net, and ESP32 antenna/ground-pad issues if present.

When ACUs are available again, I can execute the auto-layout workflow and apply the results automatically.

List unrouted nets

Review P1 placement

Run DRC review

Routing priorities

Files

Schematic

Layout

Preview

Preliminary Safety FMEA — ESP32 Haptic Glove

Scope

Design-stage FMEA for the current schematic: ESP32-S3 controller, USB-C/LiPo power, BQ24074 charger, AP2112K 3.3 V rail, DRV2605L LRA driver, remote TCS34725 ring connector, and remote fingertip LRA connector.

Failure Mode Table

Table

Subsystem	Failure Mode	Effect	Severity	Likelihood	Detection	RPN	Mitigation
LiPo battery	Unprotected cell overdischarged	Cell damage, swelling risk	8	3	5	120	Use protected LiPo pack or add protector; firmware monitors `BAT_SENSE`
Charger `U3`	Charge current too high for final cell	Battery overheating	8	3	4	96	`R7 = 3.57 kΩ` sets ~250 mA; verify against final cell capacity
USB-C input	ESD/surge on connector	Reset or IC damage	5	4	5	100	`D1` protects USB data; add VBUS/CC protection in layout/BOM if needed
Remote sensor cable `J3`	3.3 V short to GND	Battery drain, regulator heating	6	4	4	96	`U5` switchable sensor rail; firmware can power-cycle sensor rail
Remote I2C cable	Cable capacitance/noise locks bus	Sensor unavailable, firmware hang	4	5	4	80	100 kHz I2C, `R10/R11` 47 Ω series resistors, bus recovery in firmware
LRA cable `J4`	Motor lead short/open	No haptic or excess driver stress	5	4	5	100	DRV2605L current limiting; connector strain relief; test pads `TP5/TP6`
Firmware	Haptic effect loops indefinitely	User discomfort, battery drain	6	3	4	72	Add watchdog and max-on-time timeout in firmware
ESP32 RF	Antenna detuned by layout/glove	Poor BLE/WiFi range	3	5	5	75	Module at board edge with antenna keepout; validate assembled range
Remote module	Sweat/moisture ingress	Corrosion, false readings, shorts	6	4	6	144	Conformal coating/encapsulation and insulated connectors/wires

Top Risk Priority Actions

Confirm the LiPo pack is protected or add board-level protection.
Confirm final LiPo capacity supports the programmed ~250 mA charge current.
Add firmware haptic timeout and I2C bus recovery.
Mechanically strain-relieve the fingertip LRA and ring-sensor cables.
Validate antenna keepout and wireless range after layout.

Open Items

Exact battery capacity and protection status.
Exact LRA motor rated voltage/resonant frequency.
Exact cable lengths and glove environmental exposure.

Scope
Failure Mode Table
Top Risk Priority Actions
Open Items