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labs/003_esp32_blink/schematic.md

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+# Schematic
+
+## Option A: Built-In LED
+
+```text
+Computer USB -> ESP32 dev board
+Built-in LED GPIO: TBD by board model
+```
+
+## Option B: External LED
+
+```text
+ESP32 GPIO -> resistor -> LED anode
+LED cathode -> ESP32 GND
+```
+
+## Actual Circuit
+
+TODO: указать выбранный GPIO, resistor value и способ питания.