Step 3: Cut out Paper Platter

Most hard drives are finished with a black matte. It is not a conducive background for our LEDs, so we need to make a more reflective backdrop.

Grab a piece of thick, white paper and trace the outline of a platter (both the inside and outside). Cut out your paper platter, and widen the central hole a few millimeters. Slip this over the spindle, and push it down to the floor of the platter chamber. You might need to trim the paper a little so it doesn't rip. This will serve as a white, reflective backing, making the color in your LEDs shine more vibrantly.

Once the backdrop is positioned, make sure the spindle can still spin freely. If it can't, trim the center hole of your backdrop.


<p>Hi, like the instructable &amp; the video, but persistence of vision is a bit of a myth that came from the cinematic industry in the early 1900's</p>
How do you power the motor on the hard drive to get it to spin? I don't see it in the circuit and I'm not sure which wires to use on the sata power cable.
Hi, I have finished building your version of the led hard drive clock, your work is remarkable. <br> <br>One thing that i can not get working is if i press &quot;r&quot; 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 'SPURIOUS_INT' 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). <br> <br>Any help from Vishnubob or the community would be greatly appreciated. <br> <br>Note: I have bypassed the start-up pattern because it does the red animation but stays red and does not cycle through the colors.
The python script is giving me a hard time, I am using windows 7 and have python 3.3. <br>I get this error, invalid syntax: no module named serial, this happens with time also. <br> <br>Where can I download serial and time? <br>Do I have to tell the script where to look for these? <br> <br>Any help would be greatly appreciated.
Everytime I try to open the clock.py Script in Python it tells me that there's an Syntax error?<br> <br> File &quot;clock.py&quot;, line 41<br> print &quot;send =&gt; %s % msg.strip()<strong>&quot; </strong><br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | this last symbol is wrong?!<br> SyntaxError: invalid syntax
Here&nbsp;<a href="http://steyer-tec.steyer-art.de/?page_id=32" rel="nofollow">http://steyer-tec.steyer-art.de/?page_id=32<br> i</a>s my version of an HDD POV Clock with the help of the Articles from Vishnubob and David Hend (&nbsp;<a href="http://www.instructables.com/id/Hard-Drive-POV-Clock/" rel="nofollow">http://www.instructables.com/id/Hard-Drive-POV-Clock/</a>&nbsp;)<br> <br> <div> <iframe frameborder="0" height="360" src="http://www.youtube.com/embed/vJ2-xHj5W0U" width="480"></iframe><br> <br> THX to Vishnubob and David Hend! Great Work!</div>
please can anyone tell me about the HD port like wat exactly it is and where do we <br>connect the HD port.
This sketch is just the test pattern and not display the hours like the video, Right?<br><br>Sorry for my english if there is any mistake.
Umm, i think its for both, there is a file called clock.py that has to be open by some sort of program. <br> <br>Go to step 14. Good luck!
There is a project at kickstarter about a POV hard drive clock...<br>http://www.kickstarter.com/projects/680714141/hard-drive-ticktock-pov-clock
anybody else having a hard time with python/serial/mac?<br><br>its giving me a bunch of trouble, and id hate to give up on such an awesome project, right at the end.
Hello all I am wondering, can i use hall sensor ?
The ANODE is the longer and the cathode is the shorter leg of just about any L.E.D. A phototransistor's shorter leg is the collector and the longer leg is the emitter. You can look at any LED from either top or bottom and you will notice its base has a flat side - that is the cathode side. In the case of a phototransistor, the flat side indicates the collector side. Your instructions should work, but the terminology is incorrect.
Hey, just wondering what brand and how old the hdd u used was. ive opened up two seagates, which at first seemed to spin without stopping, however once the reading arm is removed, they only spin for bout 30secs and then stop. Is there any way to mod the drive to prevent this?
remove the read arm!
Try to gut the arm and keep the inner parts(coil,for example) plugged in.
<a rel="nofollow" href="http://www.lotusinvention.cn/">http://www.lotusinvention.cn/</a><br/>
capslock makes you sound rude
I use ATX power supplies harvested from old machines.
My friend Richard M and I finished one today, and it's great! I don't know if my one small problem was the result of using a LED / sensor gate from a floppy drive (see comment below), but it wouldn't sync until I widened the disk gap a little (less than 1/8" total). So, be forewarned.
Congratulations! That's awesome! If you can, please post pictures of your rig, I would love to see it. The sensor required the most tuning, I'm not surprised you had to make this adjustment. Did the code work well for you?
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. The RGB tape stuck OK. I alcohol-wiped the surfaces and washed my hands. Oh, and 2 coats of varnish on the wood. Otherwise, I'm sure the tape wouldn't stick. I chopped a segment out of the spacer ring below the disk to counter-balance, but it's too much. (You can see the removed segment in the pix.) I wound up adding a lot of screws/washers to the hub to un-compensate. It runs smooth. I didn't get a pix of the completed unit with the IR detector installed. It clamps right in the shallow wood slot. The software runs just like your video. Mine has a very slight jitter. No big bother. I want to make an arduino-less version. I think it is feasible to trigger the RGBs with 3 disk-edge slots and adjustable delay RGB triggers. My electronics basics is Nike Hercules school, but I'm much encouraged by your pioneering. THANKS.
I ripped open a 3 1/2" floppy drive and found a LED / sensor. (Lots of them in printers too, as I recall.) It even had a diagram on the back of the pcb that matched the schematic here. I rigged it up with the 270 and 10K resistors, and it put out a great 4.7V when the gate is blocked. What's nice about it is that it's very compact (and free).
Instead of using the slot as a thru-device could you mount the ir led AND photo-ransistor up-facing under the platter, with the platter painted ir-reflective 'white', then the slot would pass overhead, causing a flicker on the transistor... You might need to use an analogue line to read it, as it wouldn't be nearly as defined, especially for the slot size. If the slot could not be detected, simply paint an infrared-black dot on the underside :D AWESOME PROJECT! I'm just waiting for a drive to die now :D
I saw this on YouTube and I've been waiting for you to make an instructable of this! I'm stoked! Thanks for this instructable!
I'm in the process of building one of these myself... very cool. One thing I'd add that I had to learn is that older, smaller drives often use glass based platters that have the magnetic coating/film on top which can be sanded away. What's cool is you don't lose much in the way of balance, but on the negative side it's a little harder to sand away the magnetic coating on both sides (to make a clear slit) and I don't think you let quite as much light through as compared to: Newer, more higher capacity drives use aluminum based platters which you can cut through easily, but also would unbalance the spinning platter.
This is really cool. What would you say is the total time and cost of this project?
Thanks for your comment. If you have a few drives on hand, you will spend less than $50 in parts. It took me twelve hours to fabricate, but that was an ad-hoc process. With parts and instructions, you could build this in four hours.
That's hella slick. I'm not so sure about cutting the slot all the way through the platter though(and I'm definitely not the most safety conscious one around). If it was to come apart, that thing could have an eye out, or, worse yet, bust up such a sweet project...
Hard drives normally come in 4 speeds: 5400 RPM, 7200 RPM, 10,000 RPM, and 15,000 RPM. The latter two speeds are "expensive" and "insanely expensive," so you will most likely be using 5400 or 7200 RPM drives that equates to 90 or 120 revs/second (exactly 1.5 or 2 times the AC flicker rate in North America, 1.8 or 2.4 times the European flicker rate).
this is so cool! i'd make one if i had any old hard drives and an arduino, but i don't have either.
It creates some interesting effects in the video, if you play around with multiples of frame rates you'd get some interesting stuff, also if you can find a rough speed that's just about below POV effects then you could do the same effects in front of people, but it may case motion sickness...
now add a dvd capabilities and it would be the GREATEST gadget in the universe!
This may have been helpful. <a rel="nofollow" href="http://www.sparkfun.com/commerce/product_info.php?products_id=247">http://www.sparkfun.com/commerce/product_info.php?products_id=247</a><br/><br/>It's a prebuilt version of the IR trip gate.<br/><br/>Very Cool though! 5 stars!<br/>
Wow, that's trippy. I want one.
Nifty! Did you use 4800rpm or 7200rpm hard drives? Does it matter?
he said well over 60 times per second; there are 60 seconds in a minute (the 'm' in RPM); so 60x60=3600... I would assume that even 4800 RPM would be considered well over 3600... so it should work fine if you time it out as described.<br/>
It's more an issue of whether the microcontroller can keep up, but considering that the Atmel can do, at least 1 million ops per second, I guess it doesn't matter and my question was pointless. ;)
I used a 7200 RPM drive. As long as the drive spins well over 30 times a second, it should work fine.

About This Instructable



Bio: As a programmer and a maker, I love building things. I share my creations to inspire other folks to get out there and build.
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