Smart Espresso Scale
Worked for 17 mins 12 sec
Created 3 project docs
Firmware Starter — ESP32-S3 Smart Espresso Scale
MCU: ESP32-S3-WROOM-1-N8R8 Framework: Arduino via PlatformIO
View docBoard Bring-Up Plan — Smart Espresso Scale
Multimeter, USB current meter, oscilloscope, 500 mA current-limited USB supply if available. Firmware from the Firmware Starter project file...
View docRegulatory FCC/CE Notes — Smart Espresso Scale
Draft design-stage notes for a wireless USB-powered consumer device. | Module | Technology | Notes |
View docImplemented the smart espresso scale schematic: USB-C power/data, 1.5 A 3.3 V buck rail, ESP32-S3 BLE/USB MCU, NAU7802 load-cell ADC, I2C OLED screen, microSD local logging, buttons, and status LED. I also created/updated the design files: Project Specification, Power Budget, Firmware Starter, Board Bring-Up Plan, and Regulatory FCC/CE Notes. ERC validation for the checked schematic categories is clean.
Open items:
- L1 is still a generic 3.3 µH inductor requirement; it should be replaced with a real shielded inductor MPN before manufacturing.
- Confirm the selected OLED module accepts 3.3 V on its VCC/“5V” pin.
- Layout is not done yet; antenna keepout, buck SW-node placement, and quiet load-cell routing are critical.
Suggested next steps:
- Replace L1 with a real inductor MPN.
- Start PCB layout with ESP32 antenna at the board edge.
- Add test points for 3V3, 3V3_AFE, NAU_DRDY, I2C, SPI, and load-cell signals.
- Route and run DRC/SI checks.
Finish layout prep
Replace L1
Verify OLED power
Add test points
Start PCB layout
Run schematic review
Refine this doc
Ask about this doc
Regulatory FCC/CE Notes — Smart Espresso Scale
Status
Draft design-stage notes for a wireless USB-powered consumer device.
Wireless Technology Summary
Table
| Module | Technology | Notes |
|---|---|---|
| ESP32-S3-WROOM-1-N8R8 | Wi-Fi 2.4 GHz + Bluetooth/BLE | Use module antenna keepout exactly; product-level EMC testing still required. |
Applicable Areas
- FCC Part 15 / CE RED for wireless intentional radiator integration.
- EMC immunity/emissions for USB-powered consumer electronics.
- Low-voltage safety risk is low because input is USB 5 V only, but enclosure/water-ingress risk must be handled mechanically.
RF Integration Requirements
- Place ESP32 antenna at board edge.
- No copper, traces, components, fasteners, load-cell metalwork, or display metal under/near the antenna keepout.
- Do not use a metal enclosure/top plate that blocks the antenna without testing BLE range.
- Preserve the certified module and antenna configuration.
Documentation Checklist
- Product block diagram created in project files.
- Draft BOM/schematic exists in Flux.
- Final PCB layout/gerbers after layout phase.
- ESP32-S3-WROOM certification grants and datasheet in compliance folder.
- User manual safety/wireless statements before sale.
- EMC/RF test report from accredited lab before production sale.
Preliminary Safety/Environmental Notes
- USB-C connector, microSD slot, buttons, and display need splash/steam protection for espresso-counter use.
- microSD slot is an ESD and liquid-ingress point; consider internal-only storage or sealed access for production.
- Load-cell cable should be strain relieved and routed away from USB/buck/SD switching currents.
Status
Wireless Technology Summary
Applicable Areas
RF Integration Requirements
Documentation Checklist
Preliminary Safety/Environmental Notes
