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labs/006_i2c_lcd_1602/firmware.md

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+# Firmware
+
+## Expected Behavior
+
+- Run I2C scanner.
+- Record detected address.
+- Initialize LCD as `16x2`.
+- Print a short test message.
+
+## Physical Test Procedure
+
+1. Measure SDA/SCL idle voltage.
+2. Run I2C scanner.
+3. Adjust contrast.
+4. Print test text.
+5. Record address and actual behavior.
+
+## Code
+
+TODO: добавить I2C scanner и LCD test code после выбора workflow.
+
+## Actual Result
+
+TODO: записать scanner output и display result.