+-----------------------------------------------------------------------------------------------------------------------+
|  ESP32-DevKitC-V4  ---  desk-matrix                                                                                   |
+-----------------------------------------------------------------------------------------------------------------------+
|  Rails: 5V, 3V3, GND                                                                                                  |
|                                                                                                                       |
|  matrix  [ESP32 RMT-driven addressable LED strip (WS2812 / SK6812)]  -- Desk matrix                                   |
|    VCC   -> rail 5V                                                                                                   |
|    GND   -> rail GND                                                                                                  |
|    DIN   -> GPIO13                                                                                                    |
|                                                                                                                       |
|  Passives:                                                                                                            |
|    c1: 1000uF capacitor, matrix.VCC  <->  GND   (bulk decoupling for 64-LED current spikes)                           |
|    r1: 330ohm resistor, matrix.DIN  <->  GPIO13   (series resistor on data line; tames overshoot at the first pixel)  |
|                                                                                                                       |
|  BOM:                                                                                                                 |
|    - ESP32-DevKitC-V4                                                                                                 |
|    - ESP32 RMT-driven addressable LED strip (WS2812 / SK6812)  (matrix)                                               |
|    - 1x 1000uF capacitor                                                                                              |
|    - 1x 330ohm resistor                                                                                               |
|                                                                                                                       |
|  Power: ~20mA typical, ~60mA peak (budget 4000mA)  OK                                                                 |
|                                                                                                                       |
|  Warnings: none                                                                                                       |
+-----------------------------------------------------------------------------------------------------------------------+
