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firmware/arduino/README.md

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+# Arduino Core
+
+Arduino Core подходит для первых labs, потому что быстро дает feedback loop: write, flash, observe, measure.
+
+## Use For
+
+- Blink
+- Button input
+- PWM LED dimming
+- I2C scanner
+- LCD test
+
+## Notes
+
+- Board selection must match actual ESP32 dev board.
+- Serial logs are part of debugging, but physical measurements still matter.
+- Secrets must not be committed.