Flexible Arduino Sure to Be A Hit


Scrolling LED on soda can

Wearable, lightweight hacks have long been dominated by the Lilypad. This will probably change with the introduction of the Printoo. Using printable circuit technology, the Printoo takes a modular approach to enable hackers, makers, and engineers alike to construct flexible circuits that can be put on almost anything, including paper!

Powered by the all too familiar ATmega328, the Printoo core module is fully compatible with the Ardunio IDE. The modular design enables functionality with several other printed devices including displays, batteries, sensors and even LED strips to make many different projects possible. One of the most interesting modules is the 1.5 volt, 500 micron thick electrochromic display.

Be sure to check out their Kickstarter, which has a nice video that demonstrates the project. If funded, they will be available in October in case you want to get your hands on one. Or feel free to make your own. Just be sure to let us know if you do!

A LIN Bus Signal Injector

LIN bus signal injector

[Zapta] tipped us about his latest project: a LIN bus signal injector. For our unfamiliar readers, the LIN bus is a popular automotive bus that is used to interface with buttons, lights, etc. As [Zapta] was tired of having to press the Sport Mode button of his car each time he turned the ignition on, he thought it’d build the platform shown above to automatically simulate the button press.

The project is based around an ATMega328 and is therefore Arduino IDE compatible (recognized as an Arduino Mini Pro), making firmware customization easy. In the car, it is physically setup as a proxy between the LIN master and the slave (which explains the two 3-wires groups shown in the picture). It is interesting to note that the injection feature can be toggled by using a particular car buttons press sequence. The project is fully open source and a video of the system in action is embedded after the break.

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Sniffing Vending Machine Buses

Sniffing the Multidrop Bus


We’ve talked about a variety of protocols and how to deal with them in the past. Today, [Dan] is working on sniffing vending machine Multidrop Bus. The Multidrop Bus (MDB) protocol is a standard used in vending machines to connect devices such as currency collectors to the host controller.

To connect to the bus, interface hardware is required. [Dan] worked out compliant hardware and connected it to an Arduino. With the device on the bus, [Dan] got to work on an Arduino sketch to parse the MDB data into a human-readable format. With that working, the bus can easily be sniffed over the Arduino’s serial console.

This is just the start of a more involved project. Since this protocol is used to communicate with a vending machine’s currency collector or card reader, being able to communicate it would allow him to implement his own payment methods. The plan is to augment the vending machine he operates at Vancouver Hack Space to accept Bitcoin. We’re looking forward to seeing that project unfold.

Developed on Hackaday: Olivier’s Design Rundown

The Hackaday writers and readers are currently working hand-in-hand on an offline password keeper, the Mooltipass. A few days ago we presented Olivier’s design front PCB without even showing the rest of his creation (which was quite rude of us…). We also asked our readers for input on how we should design the front panel. In this new article we will therefore show you how the different pieces fit together in this very first (non-final) prototype… follow us after the break!

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Fixing Apple TV’s Terrible UI


Despite Apple’s unfailing dedication to UI, they still sometimes manage to put out some stinkers. The latest of these is the ‘keyboard’ for the search interface in the Apple TV. It’s an alphabetical keyboard, laid out in a square with the obvious frustration that goes along with that terrible idea. [Lasse] was frustrated with this design and realized searching anything with the Apple TV IR remote is a pain. His solution was to build his own version of the Apple TV remote with a web interface, powered by an Arduino.

Inspired by the Apple Remote Arduino Shield we featured a few years ago, [Lasse] stuck an IR LED int the pins of Arduino with an Ethernet shield, current limiting resistors be damned. The web UI is the innovative part of this build. He’s hosting a simple website on the Arduino that allows him to type – with a real keyboard – a search query into the website, and have the Arduino take care of moving the Apple TV cursor around to select each letter.

The web UI has all the features found on the Apple TV remote, including the swipe gestures, and has a really slick brushed metal texture to boot. You can check out the video of [Lasse]‘s project typing text into an Apple TV hilariously fast below.

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A Virtual Cane for the Visually Impaired


[Roman] has created an electronic cane for the visually impaired. Blind and visually impaired people have used canes and walking sticks for centuries. However, it wasn’t until the 1920′s and 1930′s that the white cane came to be synonymous with the blind. [Roman] is attempting to improve on the white cane design by bringing modern electronics to the table. With a mixture of hardware and clever software running on an Android smartphone, [Roman] has created a device that could help a blind person navigate.

The white cane has been replaced with a virtual cane, consisting of a 3D printed black cylinder. The cane is controlled by an ATmega328 running the Arduino bootloader and [Roman's] code. Peeking out from the end of the handle is a Maxbotix ultrasonic distance sensor. Distance information is reported to the user via a piezo buzzer and a vibration motor. An induction coil allows for charging without fumbling for tiny connectors. A Bluetooth module connects the virtual cane to the other half of the system, an Android phone.

[Roman's] Android app runs solely on voice prompts and speech syntheses. Navigation commands such as “Take me to <address>” use the phone’s GPS and Google Maps API to retrieve route information. [Roman's] app then speaks the directions for the user to follow. Help can be summoned by simply stating “Send <contact name> my current location.” In the event that the user drops their virtual cane, “Find my device” will send a Bluetooth command to the cane. Once the command is received, the cane will reveal its position by beeping and vibrating.

We’ve said it before, and we’ll say it again. Using technology to help disabled people is one of the best hacks we can think of. Hackaday alum [Caleb Kraft] has been doing just that with his work at The Controller Project. [Roman] is still actively improving his cane. He’s already won a gold medal at the Niagara Regional Science and Engineering Fair. He’s entered his project in several more science events, including the Canada Wide Science Fair and the Google Science Fair. Good luck [Roman]!

Reach Out and Touch Your Next Project with Long Range RC Controller


Long range wireless control of a project is always a challenge. [Mike] and his team were looking to extend the range of their current RC setup for a UAV project, and decided on a pair of Arduino mini’s and somewhat expensive Digi Xtend 900Mhz modems to do the trick. With a range of 40 miles, the 1 watt transceivers provide fantastic range. And paired with the all too familiar Arduino, you’ve got yourself an easy long range link.

[Mike] set the transmitter up so it can plug directly into any RC controller training port, decoding the incoming signal and converting it into a serial data package for transmitting. While they don’t provide the range of other RF transmitters we’ve seen, the 40 mile range of the modem’s are more than enough for most projects, including High Altitude Balloon missions.

The code for the Arduino transmitter and receiver sides is available at their github. Though there is no built-in error correction in the code, they have not had any issues.  Unfortunately, a schematic was not provided, but you should be able to get enough information from the images and datasheets to construct a working link.