USB-C Sensor Node

Worked for 6 mins 16 sec

Created 4 project docs

Firmware Starter — ESP32-S3 Sensor Motor Carrier

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MCU/module: ESP32-S3-WROOM-1 Framework: Arduino on PlatformIO

Board Bring-Up Plan — ESP32-S3 Sensor Motor Carrier

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Current-limited USB-C 5 V supply or USB power meter. Multimeter, oscilloscope if available, USB cable, PC with PlatformIO/esptool.

Technical Construction File Notes — ESP32-S3 Sensor Motor Carrier

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Draft design-stage notes. FCC Part 15 / CE RED / ISED consideration due to ESP32-S3 Wi-Fi/BLE radio module.

Preliminary FMEA — ESP32-S3 Sensor Motor Carrier

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Design-stage risk review for a USB-C powered ESP32-S3 carrier board with IMU, temperature sensor, GPS header, and a single brushed DC motor ...

flux

I created the ESP32-S3 carrier schematic with USB-C 5 V input, protected 5 V/3.3 V rails, ESP32-S3-WROOM-1, BNO085, SHT40 temperature/humidity sensor, GPS UART header, motor-driver carrier header, boot/reset buttons, status LED, and supporting passives; ERC/passive checks were clean, while layout/routing and generic passive MPN selection remain unfinished because no ACUs are currently available.

Open items:

PCB placement/routing not started; DRC airwires are expected.
Exact GPS module, motor driver carrier, motor voltage, and stall current still need confirmation.
Generic resistor/capacitor MPNs need to be assigned before manufacturing.
Motor current-sense protection/scaling should be finalized after choosing the driver carrier.

Project files created:

Suggested next steps once ACUs are available:

Confirm the exact GPS module and brushed DC motor driver carrier.
Finalize VMOTOR voltage/current limits and current-sense scaling.
Assign production MPNs for generic passives.
Proceed to PCB placement with ESP32 antenna keepout and motor-current separation.

Set module choices

Fill passive MPNs

Run ERC/DRC

Set up layout

Document requirements

Files

Schematic

Layout

Preview

Preliminary FMEA — ESP32-S3 Sensor Motor Carrier

Scope

Design-stage risk review for a USB-C powered ESP32-S3 carrier board with IMU, temperature sensor, GPS header, and a single brushed DC motor driver carrier interface.

Failure Mode Table

Table

Subsystem	Failure Mode	Effect	Severity 1-10	Likelihood 1-10	Detection 1-10	RPN	Mitigation
USB-C input	Overcurrent or downstream short	USB source trips, board heat/damage	6	3	3	54	F1 PTC on VBUS, first-power current limit, visual inspection
3V3 regulator	Thermal overload from ESP32/GPS load	Brownout, reset, hot regulator	5	4	4	80	1 A TO-220-class LDO selected; verify temperature under Wi-Fi/GPS load
ESP32 boot	Motor enable pin high during reset	Unexpected motor motion	8	3	3	72	R12/R13 pull-downs keep PWM/EN low; firmware starts safe-off
Motor supply	Wrong VMOTOR voltage or excessive stall current	Driver/carrier overheating, motor damage	8	5	5	200	Motor power is external and not applied until exact motor/driver are confirmed; size traces after stall current known
Motor carrier pinout	Header mismatch with selected carrier	Shorts or wrong control signals	7	5	4	140	Verify selected carrier pinout before layout; label J3 pinout clearly
Current sense	Driver outputs >3.3 V into ESP32 ADC	ESP32 GPIO damage	7	4	5	140	Require 0–3.3 V current-sense scaling; add divider/clamp once driver is selected
GPS header	5 V logic GPS connected to ESP32 RX	ESP32 input damage	6	3	5	90	Document 3.3 V UART logic requirement; add level shifting if chosen GPS is 5 V logic
RF/EMI	Motor current routed near antenna/IMU	Poor Wi-Fi/BLE range, noisy IMU readings	5	5	5	125	Layout separation, antenna keepout, motor return routing, bulk cap C9
Sensor placement	SHT40 near regulator/ESP heat	Temperature reading biased high	3	6	4	72	Place U3 at airflow/board edge away from heat sources
Firmware crash	Motor remains enabled	Possible uncontrolled motion	8	3	5	120	Add watchdog and safe-off fault handling in production firmware; consider hardware watchdog/driver enable gating for safety-critical use

Highest Priority Actions

Select exact motor driver carrier and motor before final J3 pinout/layout.
Confirm motor stall current and VMOTOR voltage before choosing trace widths and connector current margins.
Confirm GPS module voltage and UART level.
Add any required current-sense divider/clamp after motor driver selection.
Preserve RF antenna keepout and keep motor currents away from U1/U2/U3.

Open Items

Motor voltage/current and exact driver carrier are not specified.
GPS module is not specified.
The board is not yet laid out; thermal, RF, and current-density risks must be reviewed during layout.

Scope
Failure Mode Table
Highest Priority Actions
Open Items