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labs/005_pwm_led_dimming/firmware.md

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+# Firmware
+
+## Expected Behavior
+
+- Configure PWM on selected GPIO.
+- Sweep duty cycle from low to high.
+- Optional: print current duty cycle to serial.
+
+## Physical Test Procedure
+
+1. Start with low duty cycle.
+2. Observe LED brightness.
+3. Measure average voltage for several duty cycles.
+4. Record whether visual brightness matches expected trend.
+
+## Code
+
+TODO: добавить PWM firmware после выбора workflow.
+
+## Actual Result
+
+TODO: записать фактическое поведение.