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
Board 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...
Regulatory FCC/CE Notes — Smart Espresso Scale
Draft design-stage notes for a wireless USB-powered consumer device. | Module | Technology | Notes |
Implemented 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
