Spectrum analyzer. Build your own led matrix, 2D or 3D. The wide includes the sch and a link to a video to its properly construction. Good Luck

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光立方，一个长、宽、高由8×8×8个LED灯组成的真实3D立方体显示器-A length, width and height by the 8 × 8 × 8 LED lights composed of real 3D cube displays

基于单片机的光立方设计，3D LED ,AT89C52-Design of optical cube based on MCU