Self-Powered USB Host Mode On The HP Touchpad

touchpad-usb-host-power

[ften] was having plenty of fun running Android on his HP Touchpad, but he soon discovered that the tablet’s micro USB port didn’t provide enough juice to his peripherals when running in host mode. He started digging around and found the perfect means of providing the extra power while maintaining the device’s stock appearance.

He pried the tablet apart and installed a small DC step up converter in an empty space located behind the Touchpad’s dummy SIM slot. After wiring the converter to the battery terminals, he installed a micro USB adapter in the empty slot, which fit perfectly after a bit of sanding.

He hacked together a USB Y-cable to pull power from his new USB jack, while retaining the existing data connection through the original USB interface. You can see the results of his work in the video below, and while [ften] hasn’t said how much his mod affects the Touchpad’s battery life, he has confirmed that it will still shut down gracefully once you inevitably sap the battery dry.

Continue reading “Self-Powered USB Host Mode On The HP Touchpad”

Standalone USB Temperature Logger

[Jean] wrote in eager to share his latest project, a standalone temperature logger with USB connectivity. Back in November, [Jean] found himself wanting a temperature logger that was roughly the size of a USB memory stick. What he found on the market was not quite adequate in terms of price or size, so he decided to design his own. His would be the size he wanted and wouldn’t require any software or drivers to run. You simply plug it in, edit the configuration text file to set your intervals, and off you go!

You can follow along through the entire design and fabrication on his site. He’s really great about discussing why he made each decision and how he resolved any errors he ran into. You can download the schematics and source code on his site.

Continue reading “Standalone USB Temperature Logger”

Hacking The Kingston Wi-Drive

[Andrew] got his hands on a Kingston Wi-Drive, and being the responsible Hackaday reader he is, spent the better part of a weekend figuring out how to get root on this shiny new toy

The Kingston Wi-Drive is a small battery-powered Flash drive with a wi-fi adapter in a small, compact case. Even though Kingston is going after a fairly niche market by advertising the Wi-Drive to expand the storage of iOS and Android devices, a network attached storage solution that can fit in a pocket is somewhat interesting. Unfortunately, Kingston decided to lock down the Wi-Drive; [Andrew] can’t even get a terminal running on this little box.

After a weekend, [Andrew] is no closer to his goal of getting root on the Wi-Drive. He suspects the problem may be there simply isn’t a terminal for Telnet to bind to. [Andrew] realized he was a bit out of his league on this hack and decided to open up his research to people much more experienced in embedded Linux environments. If you’ve been playing around with a Wi-Drive, or you want a tiny battery-powered NAS, send us something on the tip line and we’ll follow up on this post.

Defying Gravity For New User Interfaces

[Jinha Lee] at the MIT Media Lab created a new interface allowing new ways to modify and play with 3D objects. It’s called ZeroN, and it’s nothing short of a futuristic device straight out of Star Trek.

ZeroN is simply a platform for levitating a small spherical permanent magnet in 3D space. It does this by mounting a hall effect sensor on an electromagnet. The hall sensor measure the strength of the magnetic field of the ball every few milliseconds and keeps the spherical magnet levitated. To move the object in 3D space, a few webcams track the ball over the platform and tell the electromagnet to move on a CNC-like x y table.

[Jinha] showed off a lot of cool stuff that is possible with the ZeroN; ping-pong is by far the coolest implementation, but it’s also possible to use the magnetic sphere to demonstrate n-body gravity or as a camera flying around a digital scene.

It’s a really amazing piece of work with an exceptional demo video. You can check that video out after the break. Thanks, [ferdinand] for sending this one in.

Continue reading “Defying Gravity For New User Interfaces”

[Matt’s] Bubble Display Updated

[Matt] emailed in to show us how he has improved his bubble display since the last time we saw it. If you recall from last time, he was having issues with the air pressure dropping when multiple bubbles were released, resulting in smaller bubbles. This time around, he has added an aesthetically pleasing air reservoir to help ensure that his bubbles don’t vary too much. There really wasn’t a reason to use two containers for the reservoir, aside from the fact it is what he had on hand. He has also torn part the part of the display that houses the oil, replacing it with individual tubes for each vertical segment. This makes it easier to regulate the speed of the bubbles, as he found they travel at a constant rate if they are in contact with the edges of the tube.

One downfall of using the vinyl tubes is the fact that it comes in a giant roll. This leaves the tube wanting to curl. To get around this, he stretched it on a wooden dowel and heated it with a heat gun till it relaxed. Using clear PVC or acrylic tubing would be an alternative but would be more expensive.

Continue reading “[Matt’s] Bubble Display Updated”

Directly Interfacing A Joystick With An Xbee

We see a pretty steady stream of projects that use Xbee modules. They’re one of the more reliable and popular ways to add a wireless aspect to your project. But we don’t often see them used to their full potential. Since there’s a microcontroller onboard, many simple tasks can be accomplished without the need for an addition microcontroller. [Stephen’s] showing how this can be done, by reading the stick and button data from a game controller using only an Xbee module.

His test setup uses an Arduino to drive servo motors on the receiving end of the hardware. You can’t do everything with Xbee, but the sender is where this concept comes into play. [Stephen] grabbed an older gamepad which is meant for use with a PC game port. The joystick uses potentiometers to measure position data, and the buttons simply complete a circuit. He altered the joystick by adding voltage dividers to the pots, and pull-up resistors to the buttons. From there he just wired it up to the Xbee and set up the module’s firmware to package and transmit the data. It’s a nice way to do more with less.

We had a little discussion here at Hackaday about Xbee modules which seem to be in short supply. Some of us think it’s due to the flooding in Thailand. If you’ve got some info on the situation, or just want to share your own conspiracy theory, let us know in the comments.

Making Laser Adjustments With An SNES Gamepad

Gaming has infiltrated everything around us. It seems that any time a control interface is needed, the first thought to many current hacker’s minds are the familiar controls from the video games we grew up with. In this example, [eljaywasi] needed a way to control the wavelength of light coming out of a laser. We don’t know exactly how he’s actually changing the wavelength, but we do know he’s using an SNES gamepad as his interface. You can see a red and a blue LED located on the front of the pad, so it may be that two buttons would have sufficed. We don’t care, we like the SNES pad better.