Prototypowanie Płytki TIMI

flux

0:11

Work done
  • Built the conservative TIMI Rev A schematic around U1 with J1, U2, F1, IC1, IC2, J3, J2, J4, SW1, SW2, SW3, LED1, LED2, LED3, R1-R7, and C1-C11.
  • Wired the fixed firmware mapping exactly: GPIO35/36/37 to status LEDs, GPIO39 to user button, GPIO9/10/11 to the INMP441 header, and GPIO4/5/6 to the MAX98357A I2S interface.
  • Implemented USB-C sink power entry with 2 x 5.1 kOhm CC pull-downs, native USB D+/D- to the ESP32-S3 through U2, polyfuse protection, separate VBUS_5V and 3V3 rails, EN/IO0 boot circuitry, UART header, and bring-up test points TP1-TP5.
  • Renamed the project, updated project metadata, and saved the system architecture diagram as a project property for traceability.
  • Set the layout to an 80 mm x 100 mm rectangular board with 3 mm corner radius, 4-layer stackup, and conservative board keepout margin.
Success criteria review
  • ✅ Confirmed use of the required U1 and included the specified power-entry, audio, debug, button, LED, and test-point features.
  • ✅ Preserved the required firmware GPIO mapping and documented it in project metadata and the implemented schematic connectivity.
  • ✅ Documented and applied PCB-level constraints for a 4-layer first revision with an intentionally roomy board size suitable for bring-up.
  • ✅ Defined validation checkpoints through review passes and corrected the major schematic issue found during implementation: the unintended VBUS_5V / 3V3 short.
  • ✅ Captured the architecture and requirements traceability in project properties for future review.
  • ❌ Net-specific PCB rules for USB/power classes could not be attached through selector-based layout-rule targeting in this pass, so antenna keepout and per-net routing constraints remain documented but not yet encoded as custom layout rules.
Next steps The schematic foundation and first-pass board constraints are in place. The next high-value step is to finish PCB-specific constraints by encoding the ESP32 antenna keepout and then placing U1 at the board edge with the USB connector and headers arranged for bring-up. I can do that next.
Build pin map
Pick regulator parts
Choose USB-C protection
Define stackup rules
11 days

Plan completed.

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    TIMI ESP32-S3 Prototype thumbnail
    Conservative first-revision TIMI prototype built around ESP32-S3-WROOM-1-N16R8 with USB-C 5V input, native USB, 3.3V regulation, onboard MAX98357A audio out, external INMP441 header, status LEDs, buttons, UART debug header, required test points, and 4-layer antenna-conscious PCB constraints.

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