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A hand-drawn pencil sketch of a 'Smart Noise Detection Alarm Light' blueprint, showing the device, MCU, and labeled components.

A hand-drawn pencil sketch of a 'Smart Noise Detection Alarm Light' blueprint, showing the device, MCU, and labeled components.
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“A hand-drawn pencil sketch of a student-made blueprint for a ‘Smart Noise Detection Alarm Light’. Draw a small rectangular box device with a front sound sensor hole, three labeled LEDs (green, yellow, red), simple internal circuit drawn with pencil, MCU board, wires, and battery. Add Korean handwritten labels such as ‘소리 센서’, ‘LED 경고등’, ‘회로’, ‘전원’, with arrows pointing to each part. Use light pencil shading, slightly uneven student-style lines, notebook paper texture, looks like drawn by a middle/high school student.” See more

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