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Hard Drive Persistence of Vision HDPOV

The platter of a hard drive spins well over sixty times a second. If a narrow slot was cut into the platter to allow LEDs to shine through, we can achieve flicker fusion and trick Nike Air Max 2016 Womens the eye into seeing a stable image. This phenomenon is known as persistence of vision (POV). There are many examples of LEDs being used for POV, building an image by moving the LEDs or having the observer move relative to them. The LEDs used in this project do not move, and the image is built using the interference of the slotted, spinning platter.

The system works by timing the slot in the platter. The Arduino uses an internal timer to clock each revolution. It achieves this using an infrared gate, which triggers a hardware interrupt on every full revolution of the platter. The Arduino uses the revolution time and phase to schedule a second internal timer. This second timer uses an interrupt to schedule the timing of the LEDs, firing tens of thousands times a second to build a stable, visible image.

This work is based on Ian Smith's version of the same. His work is excellent, and his website on this topic will help provide a complete picture for this instructable.

Hard Drives You will need to gather a few unused hard drives. It's no problem if they no longer function, but it's imperative that the candidate hard drive can spin indefinitely when it's powered.

Arduino If you don't have an Arduino board, this link will show you where you can buy one. I developed this with a Diecimila, but I would expect the code to work on a Nike Air Max 2016 Duemilanove without changes. A single 19.5" strip costs $19.95. The infrared gate uses the slot cut out of the platter to disrupt the beam. The Hall effect sensor will require that you glue a small but strong magnet exactly 180 degrees from the slot in the platter.

If you decide to use an infrared gate, you can either build your own gate from scratch or you can buy a manufactured gate. I chose to use infrared because I had the parts lying around, but a Hall effect sensor is less obtrusive. If you choose to go the Hall effect route, you will need to adjust a few details in this tutorial. For example, you will need to glue a magnet directly opposite of the slot. This will require changing the code loaded onto the Arduino to account for the 180 degree change in phase.

One thing that i can not get working is if i press to display the rpm and such, it will give me a reading of about 8000RPM, although if the key is pressed at the right time the rpm reads as something around 30000RPM 45000RPM. I have tryed playing around with the sensor, the Value and the gap in the platter, none however have given me a result. This ubove is causing lodes of visible glitches and the pattern is all messed up (Test Pattern 1).

Any help from Vishnubob or the community would be greatly appreciated.

Note: I have bypassed the start up pattern because it does the red animation but stays red and does not cycle through the colors.

Well, mine looks mostly like yours. The wood blocker is one piece, due to the small size of the IR gate. (Pix 2 is the gate, before I removed it from the PCB of the junked floppy drive.)

I cut the RGB tape very short and scraped the traces bare to solder on a compact 4 lead ribbon cable.