+---------------------------------------------------------------------+
|  ESP32-C3 SuperMini  ---  c3-supermini                              |
+---------------------------------------------------------------------+
|  Rails: 5V, 3V3, GND                                                |
|                                                                     |
|  onboard_led  [Generic GPIO switch / relay output]  -- Onboard LED  |
|    OUT   -> GPIO8                                                   |
|                                                                     |
|  onboard_button  [Generic GPIO binary sensor]  -- Onboard button    |
|    IN    -> GPIO9                                                   |
|                                                                     |
|  BOM:                                                               |
|    - ESP32-C3 SuperMini                                             |
|    - Generic GPIO switch / relay output  (onboard_led)              |
|    - Generic GPIO binary sensor  (onboard_button)                   |
|                                                                     |
|  Power: ~0mA typical, ~0mA peak (budget 500mA)  OK                  |
|                                                                     |
|  Warnings: none                                                     |
+---------------------------------------------------------------------+
