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Modular assembly (advanced)

Mount breakout modules in the printed Desk. Use this when you add hardware the main control board does not support.

The default build seats the main control board — follow assembly.md §12 and §13. This page replaces those two steps only. Electrical harness: wiring.md.

By this point the breakouts should already be wired and soldered as one harness, and firmware flashed (flash.md). Then return to assembly §14. Servo channel order is the same table in assembly §15; plug the leads into the PCA9685 instead of the board headers.

Electronics inside the desk

Leave disconnected for now:

  • ESP32 — attach the gold-pin jumper cables to the ESP32 pins in the next section
  • PCA9685 — plug servo connectors in assembly §15

Everything else in the harness stays as already soldered and assembled.

  1. USB-C breakout (Adafruit 5993) — fasten with four longer M2 screws (M2×16 mm works) and secure with M2 nuts.
  2. PCA9685 — fasten to the rails on the inside of the desk front with four short M2 screws (M2×4 mm works).
  3. MAX98357A — mount on the single rail on that same inner front wall with two M2 screws (M2×4 mm works).
  4. Speaker — stick it to an inner wall, or leave it loose inside the desk for now.

Mount in that order — USB first, then PCA9685, then MAX98357A, then the speaker — so later boards are not in the way.

Desk

ESP32, power/AP smoke test, and LampBase

  1. Seat the ESP32-C3-Zero in the opening in the desk top from above. The pins must pass through the holes in the top; the module should sit flush in the recess and not stick up above the desk surface.
  2. From underneath, connect the gold-pin jumper cables to the ESP32.
  3. Power/AP smoke test (optional but recommended) before locking the module in:
    • Confirm every wire is on the correct pin (wiring). Servo plugs and the OLED come later.
    • Firmware should already be on the board (flashed before servo centering).
    • Apply power. The ESP32 LED should light and the board should start the setup access point for configuration.
    • If that looks good, disconnect power.
  4. Place the printed LampButton under LampBase so it can press the ESP32 reset button from above — keep that access easy.
  5. Orient LampBase so its opening sits over the ESP32 status LED.
  6. Fasten LampBase to the desk with two M2 screws (M2×8 mm works). This also holds the ESP32 from above.

Desk

Next

Continue at assembly §14.