ACVoltage wrote this instructable detailing his DIY POV clock using hard disk drive and Arduino Uno:
This is a fun project that can be done easily and also cheaply. In this instructable we will explain step by step how to make this beautiful POV clock.
-Tiny RTC modul,
-IR diode and IR transistor (used like a sensor, more details in next steps)
-4 pushbuttons (for controling the clock)
-TSOP4838 (allows us to control the clock with remote controler)
-Temperature sensor (DS18B20)
-RGB led strip
-And of course and old hard disk with working motor.
Check out the video after the break.