Problem

Repurposed electronics are often reduced to static displays: visually compelling, but not operational.
I aimed to build a device that is controllable, legible, and repeatable—turning a discarded HDD into a functional audio system.

Insight

A hard drive is already a precision machine: stable rotation, tight tolerances, and expressive mechanical behavior.
If the mechanism stays visible and control stays minimal, it can become an instrument: control → motion → sound, without screens.

Build

Goal
Switch-controlled power + knob-controlled speed, coupled to real-time synthesized audio output.

Hardware

• Reclaimed HDD as kinetic core (platter + spindle motor)

• Power switch + potentiometer (continuous speed control)

• Microcontroller + motor driver (closed-loop-ish control via mapping + smoothing)

• Amplifier + dual speakers (audible output)

• Transparent acrylic enclosure (visibility, protection, structure)

Software / Signal

• Knob-to-speed mapping (with smoothing for stable control)

• Real-time sound synthesis pipeline (sound is generated live, not played back)

• Parameter coupling: rotational state drives synthesis parameters for responsive output

Engineering constraints addressed

• Mechanical stability (mounting, alignment, vibration)

• Noise vs expressiveness tradeoffs

• Cable routing, heat, and serviceability inside a compact enclosure