HDD POV clock takes the best from those that came before it

hdd-pov-clock

The concept behind this clock has been seen before, but [Dieter] tried to combine the best aspects of several projects into his HDD POV clock (translated). The basic principle of the design is to cut a slot into the top platter of the hard drive. This will let the light from some LEDs shine through. By carefully synchronizing the LED with the spinning platter a set of differently colored hands can be shown to mark time. We’ve been looking at the project for several minutes now and we’re not quite sure if the lines marking the 5-minute segments on the clock are generated in the same way as the hands, or if they’re marks on a faceplate on top of the platters. Check out the clip after the break and let us know what you think.

Past HDD clock project include this one, or this other one. Some of the design improvements include a better motor driver (which [Dieter] pulled from an old VCR) and the inclusion of an RTC chip to keep accurate time without the need to be connected to a computer. We also think it’s a nice touch to sandwich the hardware between two picture frames for a nice finished look.

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Repurposing old HDD Components

hdd-stepper

[IronJungle] had an old hard drive taking up space in his workshop, so he took it apart and wrote in to remind us how useful these old pieces of hardware can be. Aside from offering up incredibly strong magnets and donut-shaped mirrors, HDDs also come with a reliable stepper motor in tow.

He pulled theold drive apart, wiring up two of the stepper motor pins to a pair of the drive’s header pins. This allowed him to easily access the signals produced by the stepper simply by hooking up a small JST connector to the back of the drive.

From there, he can use the drive for any number of purposes. For the sake of discussion, [IronJungle] used it to flash an LED as seen in the video below – something he willingly admits is no great feat. However, stepper motors can be used for in a wide array of projects, both simple and complex. Be sure to share your favorite use for salvaged HDD motors in the comments.

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Slick 16-segment POV hard drive clock

pov_hdd_clock

Hackaday reader [svofski] sent in a fantastic looking hard drive-based POV clock (Google Translation) created by a maker in the Sichuan province of China. The clock, like the one [svofski] built, relies on LEDs placed behind the spinning platter to create the POV effect.

Quite a few carefully placed cuts have been made to the platter, which make up the segments required to display both numbers and letters of the alphabet. This isn’t a simple 16-segment POV display however. The font uses a lot of sharp edges and odd segment lengths, so we’re guessing that quite a bit of care was taken in the production of this clock.

You can see a demonstration of the clock in the video embedded below, which shows off its ability to display numbers, text, as well as a handful of simple patterns. It looks like there are some details available on the designer’s site, however it is all in Chinese, and Google’s translation is questionable at best. If only we knew someone that could give us a hand with deciphering the inner-workings of this clock…

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Stirring plate from USB enclosure

[Loreno Minati] built his own stir plate out of a hard drive enclosure. It’s the exact same hack as the one we saw a few weeks ago. A magnet was glued to the center of a computer fan, which causes the magnetic capsule inside the beaker to spin. This creates a vortex, evenly mixing the liquid.

Using a hard drive enclosure is a brilliant idea. It’s designed to sit in plain sight so you get a very nice finished look. It’s also exactly the right size for the fan itself. A potentiometer mounted in the cap of the enclosure allows for variable speeds, and the DC barrel jack is being used for the power source. Now that we think of it, this may be the best use of an external HDD enclosure we’ve ever seen (even eclipsing its original purpose). Check out a video and image gallery of the project after the break.

We’ve categorized this as a beer hack since stir plates are often built by hobbyists for growing yeast starters used in home brewing.

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Speeding up a ThinkPad x41 via a SATA SSD conversion

[Marek Walther] uses a ThinkPad x41 tablet for business on a daily basis. Since he’s on the go with the device he figures that hardware failure is eventually going to strike and with that in mind he purchased a second unit – slightly broken – to fix as a backup. He had never been excited about the speed of the tablet so he set out to find improvements. One of the options was to replace the traditional hard drive with a solid state model (translated). But simply dropping in an SSD isn’t going to make things faster. That’s because the stock drive uses a PATA interface. After a bit of snooping [Marek] discovered that the motherboard has a SATA interface that has a bridge connecting to the PATA plug. By removing the bridge and soldering a SATA cable to the board he was able to improve performance while increasing storage capacity at the same time.

Hacking a code-protected hard disk

Our friend [Sprite_TM] took a look at the security of a code-protected hard disk. The iStorage diskGenie is an encrypted USB hard drive that has a keypad for passcode entry. After cracking it open he found that the chip handling the keypad is a PIC 16F883 microcontroller. He poked and prodded at the internals and found some interesting stuff. Like the fact that there is an onboard LED that blinks differently based on the code entered; one way for the right code, another for the wrong code of the right number of digits, and a third for a wrong code with the wrong number of digits. This signal could be patched into for a brute force attacking but there’s a faster way. The microcontroller checks for the correct code one digit at a time. So by measuring the response time of the chip an attacker can determine when the leading digit is correct, and reduce the time needed to crack the code. There is brute force protection that watches for multiple incorrect passwords but [Sprite_TM] even found a way around that. He attached an AVR chip to monitor the PIC response time. If it was taking longer than it should for a correct password the AVR resets the PIC before it can write incorrect attempt data to its EEPROM. This can be a slow process, but he concluded it should work. We had fun watching the Flash_Destroyer hammer away and we’d like to see a setup working to acquire the the code from this device.

Vector plotter with lasers

[Hubert] sent in his experiments using HDDs, CDROMs, speakers, and other components to make an XY laser plotter. Those carefully reading will note, its not all three to make one plotter, but rather three plotters each using a separate system. The setups have their advantages and disadvantages, and [Hubert] is sure to point them out; including circuit diagrams and pictures to help you on your own trials.

There is a little difficulty in reading English not so good, but considering we’ve never seen a single-laser vector plotter done before (spirographs come close, and no one wants to wait 85 seconds) it’s still very impressive.

[Thanks TJ]