ESP32-S3 Watch Design

Created 7 project docs

RF Design Evidence — ESP32-S3 OLED Watch

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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

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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

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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

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

RF Design Evidence — ESP32-S3 OLED Watch
Status: Draft design-stage evidence; not a certification record.
Parent file: FCC/CE Technical Construction File
Implemented RF Design
  • Radio module: U1, ESP32-S3-MINI-1-N8, Espressif, 8 MB flash.
  • Radio functions in the project specification/library data: 2.4 GHz Wi-Fi 802.11 b/g/n and Bluetooth 5 LE.
  • Antenna type: module-integrated PCB antenna, as identified by the selected module description and project specification.
  • Supply: regulated 3V3 from U3 TPS63020DSJR; C10 100 nF and C11 22 uF provide local module bypass/bulk capacitance.
  • No external RF connector, amplifier, matching network, or alternate antenna is present in the schematic.
Integration Constraints
  1. Place the module antenna end at an exposed PCB edge.
  2. Apply the exact Espressif module-datasheet antenna keepout on every copper layer; no traces, planes, vias, battery, display metal, shield, or enclosure conductive features may enter it.
  3. Preserve the selected module, antenna implementation, firmware RF limits, and supply range used by any relied-upon modular approval.
  4. Keep the battery and OLED behind the non-antenna portion of the PCB.
  5. Record final module orientation, edge setback, keepout dimensions, layer stack, ground reference, and nearby component geometry.
  6. Evaluate the final enclosure, wrist/body proximity, display, battery, and charging cable as part of the host product—not only the module.
Exact Open Evidence Items
  • Official module FCC ID, CE/RED reports, grant notes, approved antenna conditions, and label requirements: not present in project data; obtain from Espressif or the authorized module supplier.
  • Certified antenna gain and RF exposure basis: not verified.
  • Final PCB layout screenshots/Gerbers proving keepout and placement: pending layout review.
  • Final enclosure materials, metal spacing, wrist/body separation, and battery/display geometry: pending mechanical design.
  • Firmware region, channel, bandwidth, transmit-power limits, BLE modes, and production lock-down: pending firmware release.
  • Host radiated emissions, conducted emissions, immunity, spurious emissions, and RF exposure reports: pending accredited-lab testing.
  • Module label visibility or host “contains” labeling: pending verification of the actual grant conditions.
Release Gate
Do not claim modular-approval inheritance until the exact module approval documents and integration conditions are reviewed against the released PCB, enclosure, firmware, and production BOM.

  • Implemented RF Design

  • Integration Constraints

  • Exact Open Evidence Items

  • Release Gate