Hackaday Links: September 28, 2011

Disposable coffee maker

[Sepehr] didn’t have a coffee maker, and the local coffee shops were all out of joe. He got his fix by making a drip coffee maker out of disposable cups and knives.

Flexible braille display

Thin film technology is being developed to help the visually impaired. This flexible OLED display has embedded muscle cells which create a braille display. [Thanks Aaron]

Printable iPhone tripod mount

Looking to make those iPhone videos a little more stable, and the pictures a little less blurry? Try out this printable tripod mount that [Chris] came up with.

Arduino macro photos

Speaking of photographs, [Daniel] wrote in to share some macro pictures he took of an Arduino. They’re sure to be of interest to those readers who love everything Arduino.

Carpeting a mouse

Add a unique texture to your mouse by covering part of the body with fabric. The lower half of the mouse case above is covered in a carpet-like material [translated]. [Thanks Clicker]

Adding wireless controls to vintage stereo equipment

marantz_wifi_remote_control

[Jean] was shopping around for a vintage stereo receiver, and happened upon a broken, but repairable Marantz 4240. After getting things back to working order, he thought it would be great if he could use his iPhone to remotely control the unit (PDF Writeup, Schematics and Code).

He scrounged around for parts, and after locating a PIC and a handful of parts from old copiers and printers, he got down to business. He etched some custom boards to house electronic bits, then strapped motors to the volume and source selection knobs. He also rigged up the push button power switch on the receiver, using a small servo and a bit of string.

Now, he can control everything using his iPhone, which communicates with the stereo over WiFi. While the power, volume knob, and input selector can be triggered remotely, he still has the ability to tweak any of these items manually if desired.

We think that this is a great way to add modern amenities to vintage electronics, without ruining the aesthetics of the components. Don’t take our word for it though, check out the video demonstrations [Jean] but together after the jump.

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Ohm Sense makes sense of resistor color bands

[Alex Busman]‘s first foray in iOS programming looks like a pretty useful tool. He came up with Ohm Sense, an iPhone app that will take a picture of a resistor and calculate the value based on the color bands. It’s a great tool that we wish we had when we were starting out. At 99 cents, the app is also much cheaper than the emotional cost of our relationship with Violet.

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Hackaday Links: July 31, 2011

Indestructible earbuds

We’re still waiting for our [Lt. Uhura] style earbuds. But until then, can we interest anyone in a set that will stand up to some abuse?

Solder Pot Scavenger

[Felicitus] says we should get a solder pot and use it to scavenge for parts. His method looks pretty easy and it’s cheaper than buying a rework station for this purpose.

Smartphone cooling

Turn all your hacking skills loose to beat the heat. That’s what [Stephanie] did when she added iPhone control for an oscillating fan.

Tunes calculator

Graphing equations and crunching numbers wasn’t enough for [Drew]. He went and figured out how to make his TI-84+ play music off of a thumb drive.

Geek-chic

Don’t let anyone out-geek you at company parties. Beef up your arsenal with this resistor color-code necktie. And yes, you can wear it with a T-shirt!

Bringing an iWallet back to life

iwallet_bluetooth_hack

The iWallet is a slick little device if you’ve got a big wad of cash burning a hole in your pocket. The $600 price tag was a little much for [cmw] to swallow, so he bought a water damaged iWallet on eBay with hopes of repairing it. Once took a close look, he knew that repairing it was a lost cause, so he decided to hack it instead.

He pulled out most of the wallet’s electronics save for the motor that opens the device, and replaced the damaged parts with his own. He installed an Arduino pro as well as a Bluetooth module, powering the pair with a small rechargeable LiPo battery. The iWallet’s fingerprint reader was then replaced with a series of LEDs that show the device’s Bluetooth connectivity status.

[cmw] can now connect his wallet to his phone, issuing unlock commands via Bluetooth. If you don’t want to fork out the cash, his version is nearly as good as the real thing.

Continue reading to see a quick video of [cmw’s] iWallet hack in action.

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iPhone to Arduino communications sans jailbreak

iphone_to_arduino

When Google released their ADK allowing Android smart phones to interact with Arduino-based devices, we’re sure there were at least one or two iPhone users who felt left out. Thanks to the folks over at Redpark, those people can now interact with an Arduino without having to jailbreak their phone.

For anyone looking to do any sort of iPhone/Arduino interaction, this is a good thing – except for the price. The 30-pin to serial cable is currently available over at Make for $59, which honestly seems pretty steep to us. When we first saw this announced, our initial thoughts were that we would see an open-source version in no time.

Unfortunately, that idea was short-lived, as we were quickly reminded of Apple’s MFI program. If you are not familiar, MFI (aka Made for iStuff) program limits what can be connected to an iDevice via licensing fees and a boatload of legal agreements. While we won’t be picking up this dongle any time soon, we’re all ears if someone has done any reverse-engineering of those pesky MFI chips.

Shoulder surfing with openCV

shoulder_surfing_with_shoulder_pad

While it seems that many people are wise to shoulder surfing, keeping a lookout for anyone spying on their passwords, [Haroon] wrote in to remind us that the threat is just as real today as it ever was.

The subjects of his research are touch screen phones and tablets, which utilize on-screen keyboards for data entry. He says that while nearly all password entry boxes on these devices are obscured with the traditional line of asterisks, the keyboards themselves are quite an interesting vulnerability.

Since touch screen technology can be finicky at times, most vendors ship their devices with some sort of key press verification system. On the iPhone and iPad, for instance, each key is highlighted in blue following a button press. This functionality makes it quite easy for shoulder surfers to casually steal your password if you’re not paying attention.

But what if you are well aware of your surroundings? [Haroon] has developed a piece of software he calls shoulderPad, which is based on openCV that does the surfing for him. The application can monitor a video stream, live or recorded, extracting the user’s password from the highlighted button presses. His demonstrations show the recording taking place at a relatively close distance, but he says that it would be quite easy to use surveillance footage or zoom lenses to capture key presses from afar.

He does say that the button highlighting can be easily disabled in the iPhone’s options pane, which should negate this sort of attack for the most part.

Continue reading to see a quick video of shoulderPad in action.

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