+-----------------------------------------------------------------------------------------------+
|  M5Stack AtomU  ---  atomu-onboard                                                            |
+-----------------------------------------------------------------------------------------------+
|  Rails: 5V, 3V3, GND                                                                          |
|                                                                                               |
|  onboard_led  [ESP32 RMT-driven addressable LED strip (WS2812 / SK6812)]  -- Onboard RGB LED  |
|    VCC   -> rail 5V                                                                           |
|    GND   -> rail GND                                                                          |
|    DIN   -> GPIO27                                                                            |
|                                                                                               |
|  onboard_button  [Generic GPIO binary sensor]  -- Onboard button                              |
|    IN    -> GPIO39                                                                            |
|                                                                                               |
|  onboard_ir  [IR transmitter (remote_transmitter)]  -- Onboard IR blaster                     |
|    IR    -> GPIO12                                                                            |
|                                                                                               |
|  onboard_mic  [I2S / PDM microphone (i2s_audio)]  -- Onboard microphone                       |
|    WS    -> GPIO5                                                                             |
|    DIN   -> GPIO19                                                                            |
|                                                                                               |
|  BOM:                                                                                         |
|    - M5Stack AtomU                                                                            |
|    - ESP32 RMT-driven addressable LED strip (WS2812 / SK6812)  (onboard_led)                  |
|    - Generic GPIO binary sensor  (onboard_button)                                             |
|    - IR transmitter (remote_transmitter)  (onboard_ir)                                        |
|    - I2S / PDM microphone (i2s_audio)  (onboard_mic)                                          |
|                                                                                               |
|  Power: ~22mA typical, ~65mA peak (budget 500mA)  OK                                          |
|                                                                                               |
|  Warnings: none                                                                               |
+-----------------------------------------------------------------------------------------------+
