ESP32-S3 Watch Design

Created 7 project docs

RF Design Evidence — ESP32-S3 OLED Watch

View Document
Status: Draft design-stage evidence; not a certification record. Radio module: U1, ESP32-S3-MINI-1-N8, Espressif, 8 MB flash.

Draft Declaration of Conformity — ESP32-S3 OLED Watch

View Document
DRAFT — NOT SIGNED, NOT VALID FOR MARKET PLACEMENT, AND NOT A CLAIM OF COMPLIANCE Product name: ESP32-S3 OLED Watch

Preliminary Safety Analysis — ESP32-S3 OLED Watch

View Document
Status: Design-stage analysis only; not a safety certification. Indoor wrist-worn consumer prototype/reference design; not medical or safety...

Preliminary Safety FMEA — ESP32-S3 OLED Watch

View Document
Scale: Severity (S), Likelihood (L), Detection difficulty (D): 1 low/easy to 5 high/difficult. RPN = S×L×D. Values are preliminary engineeri...
Show 3 More

flux

Created the complete ESP32-S3 OLED watch schematic with USB-C, 200mA LiPo power-path charging, 3.3V buck-boost regulation, BMI270 IMU, MAX17048 fuel gauge, OLED, and five buttons. All 52 components and 30 nets are electrically verified with zero ERC errors and no wire/symbol collisions.
Open items
  • PCB dimensions, battery size, enclosure, and final OLED mechanical geometry must be defined before layout.
  • R7 is DNP when using a battery with a 10kΩ NTC; populate it for a two-wire battery.
  • Detailed requirements are in the Project Specification and Power Budget.
Suggested next steps
  1. Define the watch outline and OLED/battery dimensions.
  2. Begin four-layer PCB placement with the ESP32 antenna keepout.
  3. Review the Firmware Starter.
  4. Proceed to routing after placement approval.
P

purplerock

arrange the schematic by functional group.

flux

I’ll reorganize the schematic into clearly separated functional blocks, preserve every connection and value, then re-run electrical and geometry checks.

flux

Arranged all 52 schematic components into distinct functional groups: USB/protection, LiPo charging, buck-boost supply, ESP32-S3, I²C peripherals, OLED, and user controls. Connectivity is unchanged, with zero ERC errors, wire collisions, symbol collisions, or label collisions.
Open items
  • 15 cosmetic lint warnings remain: three unavoidable pin-alignment kinks, two cross-group resistor-bank warnings, and duplicated distant-ground warnings for the isolated USB block.
Suggested next steps
  1. Define watch PCB dimensions and display/battery geometry.
  2. Start four-layer PCB placement with the ESP32 antenna keepout.
  3. Review placement before routing.
Layout, review and BOM
Start PCB layout
Define placement intent
Review schematic deeply
Check BOM risk
Fix cosmetic warnings
Sign up to send

Files

Schematic

Layout

Preview

FCC/CE Technical Construction File — ESP32-S3 OLED Watch
DESIGN-STAGE DRAFT. No FCC authorization, CE marking, RED conformity, FCC ID, test report, antenna gain, or standards compliance is claimed by this file.
Linked Project Evidence
Product Scope
Rechargeable indoor consumer wearable using U1 ESP32-S3-MINI-1-N8 for 2.4 GHz Wi-Fi/Bluetooth LE, USB-C charging/native USB, OLED display, BMI270 motion sensing, and MAX17048 battery monitoring. Current project state: completed schematic; final PCB, enclosure, battery pack, production BOM, firmware release, labels, and lab evidence remain open.
Controlled Design Baseline
  • Project: ESP32-S3 OLED Watch.
  • Schematic: 52 components, 30 nets.
  • Radio: ESP32-S3-MINI-1-N8 with integrated PCB antenna; no external RF path in schematic.
  • Power: protected single-cell LiPo assumption; BQ24074RGTR power path/charger; TPS63020DSJR 3.3 V rail.
  • Interfaces: USB-C sink, native USB 2.0, one I2C bus, OLED, IMU, fuel gauge, buttons.
Regulatory Strategy — To Be Confirmed
United States
  • Candidate framework: FCC Part 15 intentional radiator rules for the final 2.4 GHz host product.
  • A module approval may reduce transmitter evidence only if the exact U1 grant and all integration conditions are verified and preserved.
  • Host digital emissions, labeling, user notices, RF exposure, simultaneous operation, enclosure/layout changes, and unapproved firmware settings remain host responsibilities.
European Union
  • Candidate framework: RED 2014/53/EU, applicable EMC/safety/RF-exposure requirements, and RoHS technical documentation.
  • Final harmonized standards, editions, risk route, economic-operator details, and evidence set require confirmation by the responsible compliance professional/lab.
Pre-Certified-Module Integration Assumptions
  • Exact module variant remains ESP32-S3-MINI-1-N8 with its integrated PCB antenna.
  • Antenna end will be at a PCB edge with the datasheet keepout maintained on every layer.
  • No antenna substitution, RF amplifier, matching change, shield/enclosure detuning, or firmware power/channel expansion will be introduced without reassessment.
  • These are assumptions only; the actual approval grant, approved antenna conditions, FCC ID, CE reports, and integration instructions are not stored in the project and must be obtained externally.
Evidence Register

Table

EvidenceState / owner action
Project specification and power budgetPresent in project files
Released schematic and regulatory BOMSchematic present; production BOM not frozen
Module datasheetLibrary URL present
Module approval grants/reports/label instructionsExternal open item
RF design/layout evidenceDraft file; final placement/keepout proof pending
PCB stackup, Gerbers, placement, antenna keepout screenshotsPending layout release
Enclosure/battery/display mechanical evidencePending mechanical release
Firmware RF configuration and version controlPending production firmware
Safety risk analysis and FMEAPreliminary drafts present
RED/FCC/EMC/RF-exposure lab reportsNot available; pending test plan and lab work
RoHS/REACH supplier declarationsPending production AVL
Draft EU Declaration of ConformityDraft only; unsigned
User instructions/regulatory noticesOutline only
Mandatory Release Gates
  1. Verify exact U1 module approval identifiers and grant conditions from authoritative records.
  2. Freeze and review antenna placement, all-layer keepout, ground layout, enclosure, display, battery, and wrist/body spacing.
  3. Freeze firmware region/channel/bandwidth/transmit-power settings and production controls.
  4. Assign real MPNs to DS1, L3, and all generic passives; collect supplier material declarations.
  5. Complete product-level RF, EMC, RF-exposure, and safety test plan; archive accredited-lab reports.
  6. Finalize labels, manual notices, legal manufacturer/importer information, and signed DoC only after evidence closure.

  • Linked Project Evidence

  • Product Scope

  • Controlled Design Baseline

  • Regulatory Strategy — To Be Confirmed

  • United States

  • European Union

  • Pre-Certified-Module Integration Assumptions

  • Evidence Register

  • Mandatory Release Gates