TwitterPrinter Keeps Track of 2015 Hack-A-Day Prize

[Mastro Gippo] is getting to be somewhat of a Hackaday legend. He didn’t win the 2014 Hackaday prize but was in attendance at the event in Munich, and to make sure he keeps up with this year’s Prize, he built this old-school printer that prints all of the updates from the Hackaday Prize Twitter account.

The device uses the now-famous ESP8266 module for connecting the printer to the Internet. It doesn’t scrape data straight from Twitter though, it looks at [Mastro Gippo]’s own server to avoid getting inundated with too many tweets at once. The program splits the tweets into a format that is suitable for the printer (plain text) and then the printer can parse the data onto the paper. The rest of the design incorporates a 3.3V regulator for power and some transistors to turn the printer on and off. Be sure to check out the video of the device in action after the break!

[Mastro Gippo] notes that this eliminates the need to have a smartphone in order to keep up with the 2015 Hackaday Prize, which is ironic because his entry into the Trinket Everyday Carry Contest was a smarter-than-average phone. We’ll be expecting something that doesn’t waste quite as much paper for his official contest entry, though!

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Using RC Transmitters With Flight Simulators

It’s winter, and that means terrible weather and very few days where flying RC planes and helicopters is tolerable. [sjtrny] has been spending the season with RC flight simulators for some practice time. He had been using an old Xbox 360 controller, but that was really unsuitable for proper RC simulation – a much better solution would be to use his normal RC transmitter as a computer peripheral.

The usual way of using an RC transmitter with a computer is to buy a USB simulator adapter that emulates a USB game pad through a port on the transmitter. Buying one of these adapters would mean a week of waiting for shipping, so [sjtrny] did the logical thing and made his own.

Normally, a USB simulator adapter plugs in to a 3.5mm jack on the transmitter used for a ‘buddy box’, but [sjtrny] had an extra receiver sitting around. Since a receiver simply outputs signals to servos, this provides a vastly simpler interface for an Arduino to listen in on. After connecting the rudder, elevator, aileron, and throttle signals on the receiver to an Arduino, a simple bit of code and the UnoJoy library allows any Arduino and RC receiver to become a USB joystick.

[sjtrny] went through a second iteration of hardware for this project with a Teensy 3.1. This version has higher resolution on the joystick axes, and the layout of the code isn’t slightly terrible. It’s a great project for all the RC pilots out there that can’t get a break in the weather, and is also a great use for a spare receiver you might have sitting around.

Dial is a Simple and Effective Wireless Media Controller

[Patrick] was looking for an easier way to control music and movies on his computer from across the room. There is a huge amount of remote control products that could be purchased to do this, but as a hacker [Patrick] wanted to make something himself. He calls his creation, “Dial” and it’s a simple but elegant solution to the problem.

Dial looks like a small cylindrical container that sits on a flat surface. It’s actually split into a top and bottom cylinder. The bottom acts as a base and stays stationary while the top acts as a dial and a push button. The case was designed in SOLIDWORKS and printed on a 3D printer.

The Dial runs on an Arduino Pro mini with a Bluetooth module. The original prototype used Bluetooth 2.0 and required a recharge after about a day. The latest version uses the Bluetooth low energy spec and can reportedly last several weeks on a single charge. Once the LiPo battery dies, it can be recharged easily once plugged into a USB port.

The mechanical component of the dial is actually an off-the-shelf rotary encoder. The encoder included a built-in push button to make things easier. The firmware is able to detect rotation in either direction, a button press, a double press, and a press-and-hold. This gives five different possible functions.

[Patrick] wrote two pieces of software to handle interaction with the Dial. The first is a C program to deal with the Bluetooth communication. The second is actually a set of Apple scripts to actually handle interaction between the Dial and the various media programs on his computer. This allows the user to more easily write their own scripts for whatever software they want. While this may have read like a product review, the Dial is actually open source! Continue reading “Dial is a Simple and Effective Wireless Media Controller”

“Superfan” Gaming Peripheral Lets You Feel Your Speed

Virtual reality has come a long way but some senses are still neglected. Until Smell-O-Vision happens, the next step might be feeling the wind in your hair. Perhaps dad racing a sportbike or kids giggling on a rollercoaster. Not as hard to build as you might think, you probably have the parts already.

HAD - Superfan4Off-the-shelf devices serve up the seeing and hearing part of your imaginary environment, but they stop there. [Jared] wanted to take the immersion farther by being able to feel the speed, which meant building his own high power wind generator and tying it into the VR system. The failed crowdfunding effort of the “Petal” meant that something new would have to be constructed. Obviously, to move air without actually going on a rollercoaster requires a motor controller and some fans. Powerful fans.

A proponent of going big or going home, [Jared] picked up a pair of fans and modified them so heavily that they will launch themselves off of the table if not anchored down. Who overdrives fans so hard they need custom heatsinks for the motors? He does. He admits he went overboard and sensibly way overbudget for most people but he built it for himself and does not care.

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Sega Controller Hack Updated for Windows Auto-Launch

Who knew that modern versions of Windows have nixed the option to auto-launch when a USB drive is inserted? Not a big deal unless, like [sonicdude10], you want to base a hack on the behavior. He did find a workaround and recently built a Sega Controller emulator to autoplay on Windows computers.

The bulk of the hack was inspired by a Sega Emulator built in a controller which he saw on Hackaday a couple of years back. It’s simply a Sega-like USB gamepad which has a hub and thumb drive internalized. The hardware changes on [sonicdude10’s] version gets rid of the old thumb drive and replaces it with one that supports U3. This is a hardware emulation trick supported by some USB drives which allows them to enumerate as CD drives instead of USB mass storage. Autoplay for CD drives is still functional in Windows.

We’ve heard a bit about U3 over the years. There was a now-dead hack covered all the way back in 2006. And we even found a comment suggesting its use for USB-based game emulators. [sonicdude10] points to two useful tools that let him customize how U3 performs. u3_tool is a multitool for tweaking how the hardware behaves, u3-autorun makes customization of the auto-launching app a snap.

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Electronic Glove Detects Sign Language

A team of Cornell students recently built a prototype electronic glove that can detect sign language and speak the characters out loud. The glove is designed to work with a variety of hand sizes, but currently only fits on the right hand.

The glove uses several different sensors to detect hand motion and position. Perhaps the most obvious are the flex sensors that cover each finger. These sensors can detect how each finger is bent by changing the resistance according to the degree of the bend. The glove also contains an MPU-6050 3-axis accelerometer and gyroscope. This sensor can detect the hand’s orientation as well as rotational movement.

While the more high-tech sensors are used to detect most characters, there are a few letters that are similar enough to trick the system. Specifically, they had trouble with the letters R, U, and V. To get around this, the students strategically placed copper tape in several locations on the fingers. When two pieces of tape come together, it closes a circuit and acts as a momentary switch.

The sensor data is collected by an ATmega1284p microcontroller and is then compiled into a packet. This packet gets sent to a PC which then does the heavy processing. The system uses a machine learning algorithm. The user can train the it by gesturing for each letter of the alphabet multiple times. The system will collect all of this data and store it into a data set that can then be used for detection.

This is a great project to take on. If you need more inspiration there’s a lot to be found, including another Cornell project that speaks the letters you sign, as well as this one which straps all needed parts to your forearm.
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Right Hand Loses Job As Head-Mouse Enters Mousing Arena

Moving the cursor around your computer screen is an everyday occurrence that we humans do not give much of a second thought to. But what if you didn’t have to move your hands from the keyboard anymore? Sure there are keyboards with Track Point or even track pads not to far from the keys, which isn’t too bad. What if you could just slightly point your face in the desired direction the mouse would move? The [Sci-Spot] folks wondered that same question and came up with a DIY Head Mouse.

The concept is pretty darn simple; a web cam is mounted to the user’s head and points at the computer screen. Mounted on top of the screen is one IR LED. Our eyes can not see the IR light so it is not annoying or distracting. The camera, however, is filtered to only see IR by placing a couple of layers of camera film negative over the lens. Before you go complaining about strapping a camera to your noggin just think of building it into a hat, which we’ve seen used for adaptive technologies like this PS3 controller.

Custom software was written to move the mouse cursor; see the black window in the above dialog box? That represents the webcam’s field of view and the white spot is the IR LED. When the user’s head moves, the IR LED moves in relation to the camera’s field of view, in turn telling the computer to move the cursor a certain amount. There are a couple of options available like ‘magnification’ which changes how much the cursor moves with a given amount of head movement and ‘deadzone’ that ignores extremely small movements that can result from breathing.

There is no mention of how button clicks are recorded but we think a couple of buttons right below the space bar would be great. The control software is available for download on the Sci-Spot page for those who want to make their own.