Running a Laundromat with an Arduino

Wasch_140

[Hubert] sent us a tip about a friend’s project to rescue a laundromat from its failing electronics. We’re not entirely sure what went wrong with the old control center, but considering a replacement would have cost nearly 25,000 EUR, we think [Stefan] found the perfect solution: he gave it an Arduino and Android overhaul (translated).

Although [Stefan] explains that the boards were defective, perhaps one of our German readers can help us out with a more specific translation. More clear, however, are the steps taken to upgrade the system. The situation at the laundromat was a bit of an emergency: there was no way for customers to pay for use of the machines. As a result, [Stefan] had free reign to overhaul things as he saw fit. He decided to remove the complex button setup in favor of a touchscreen Android tablet, which provided users with a simple interface to make selections. The tablet serves only as an input device. The heavy lifting is handled by an Arduino Mega 2560, which hooks up to what remains of the original system and controls the 27 machines in the laundromat.

[Stefan] admits that he isn’t a particular fan of the Arduino, but that for the price, it’s a tough solution to beat. He’s not the only one overhauling with Arduinos. Check out some other examples of upgraded machines, like the Arduino-enhanced PopCARD vending machine.

UPDATE: [Andreas] sent in a better translation of the project page which we’ve included below. He worries his written English isn’t the best, but we think it is a lot easier to understand than the machine translation. Thank you for you work [Andreas!]

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Getting a Shell on any Android Device

USB

If you’re an Evil Customs Agent or other nefarious Three Letter Agency Person, you’re probably very interesting in getting data off people’s phones. Even if the screen is locked, there’s a way around this problem: just use the Android Debug Bridge (ADB), a handy way to get a shell on any Android device with just a USB cable. The ADB can be turned off, though, so what is the Stasi to do if they can’t access your phone over ADB? [Michael Ossmann] and [Kyle Osborn] have the answer that involves a little-known property of USB devices.

USB mini and micro plugs have five pins – power, ground, D+, D-, and an oft-overlooked ID pin. With a particular resistance between this ID pin and ground, the USB multiplexor inside your phone can allow anyone with the proper hardware to access the state of the charger, get an audio signal, mess around with the MP3s on your device, or even get a shell.

To test their theory, [Michael] and [Kyle] rigged up a simple USB plug to UART adapter (seen above) that included a specific value of resistor to enable a shell on their test phone. Amazingly, it worked and the thought of having a secure phone was never had again.

The guys went farther with some proprietary Samsung hardware that could, if they had the service manual, unlock any samsung phone made in the last 15 years. They’re working on building a device that will automagically get a shell on any phone and have built some rather interesting hardware. If you’re interested in helping them out with their project, they have a project site up with all the information to get up to speed on this very ingenious hack.

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20 Android Tablets form an Interactive Photo Collage

20tabletFrame

You might not have a small army of unused tablets lying around, but if you did, you should try turning them into what Minn calls a “Giant Interactive Photo Array Display:” A Giant IPAD. Har har.

[Minn's] first step was to hit eBay, hoping to find a score of low-priced, broken-yet-easily-repairable tablets. The only ones available (and for cheap), however, were resistive touch screens with narrow viewing angles. After waiting patiently for nearly half a year, [Minn] hit the capacitive touch jackpot: snagging a pile of 10″ and 7″ Android tablets. The frame is custom made to provide a solid surface for mounting and enough depth for the tablets to fit correctly. Rather than form his own brackets to hold each device, [Minn] re-purposed some IKEA cupboard handles, screwing them into the MDF backboard and clamping the tablets to them with bolts that press against the case. An adhesive rubber bumper stuck to the top of the bolts prevents any damage.

Providing power to the diverse collection required another custom solution; two 5V 10A supplies and one 9V 16A supply fit into an accompany box safely deliver the needed juice. [Minn] chose an app that will grab photos from cloud storage so he can update the collection without having to dig around inside the frame. See the result in a video below! Want to try this project but only have one tablet to spare? The in-wall tablet mount might help.

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1Sheeld Uses Your SmartPhone as an Arduino Accessory

1sheeld

The Arduino can be a bit of a gateway board. You start with an Uno, then a shield, then another. Before you know it, you have an entire collection of shields. This is the problem 1Sheeld wants to solve. 1Sheeld allows a you to use your cell phone as a sensor and I/O suite for your Arduino, replacing many existing shields. We think this will be a great idea, especially with all the older phones coming off contract these days. The sensor capabilities of the average smartphone, as well as the LCD and touchscreen I/O capabilities could make for an interesting pairing.

Currently the 1Sheeld page is just a sign up for an upcoming kickstarter, which leaves many details to the imagination. It appears that the 1Sheeld will be a bluetooth based board. A few questions do remain to be answered though – will the 1Sheeld use the Android ADK? The software is what we’re waiting to see. The software running in the 1Sheeld module bluetooth chip will be important, but the software running phone side will be the real make or break of this module. We would love to see more smartphones being used for hardware hacking rather than collecting dust once they’ve been replaced.

[Via TechCrunch]

LED-Guided Piano Instruction

LEDpianoGuide

[Kay Choe] can’t play the piano. Rather, he couldn’t, until he converted his keyboard to include LED-guided instruction. [Kay] is a microbial engineering graduate student, and the last thing a grad student can afford is private music lessons. With $70 in components and a cell phone, however, he may have found a temporary alternative.

The build works like a slimmed-down, real-world Guitar Hero, lighting up each note in turn. We’ve seen a project like this before, with the LEDs mounted above the keys. [Kay]‘s design, however, is much easier to interpret. He embedded the LEDs directly into the keys, including ones above each black key to indicate the sharps/flats. An Android app takes a MIDI file of your choice and parses the data, sending the resulting bits into an IOIO board via USB OTG. A collection of shift registers then drives the LEDs.

For a complete novice, [Kay] seems to benefit from these lights. We are unsure whether the LEDs give any indication of which note to anticipate, however, as it seems he is pressing the keys after each one lights up. Take a look at his video demonstration below and help us speculate as to what the red lights signify. If you’re an electronics savant who wants to make music without practicing a day in your life, we recommend that you check out [Vladimir's] Robot Guitar.

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ArduGuitar, an Arduino Controllable Guitar

The ArduGuitar

Electric guitars have several switches and potentiometers for controlling volume, tone, and which pickups are enabled. Rather than fiddling with these by hand, [Bob] built the ArduGuitar. It uses an Arduino to control the parameters over Bluetooth. This allows for musicians to configure presets, then recall them as needed, providing the exact same sound every time. It’s similar to the Guitarduino, but adds wireless control.

The internals of the ArduGuitar consist of the Arduino Micro, a BlueSMiRF from Sparkfun, and resistive opto-isolators. The resistive opto-isolators allow the Arduino to adjust resistance through an electrically isolated barrier. This prevents the Arduino from interfering with the guitar’s sound.

Some of the first Vactrols were used to create a tremolo effect in guitar amplifiers. These pulsed a incandescent lamp onto a photoresistor. Fortunately, there are now integrated solutions. PerkinElmer makes these, and they have a nice application note [PDF] on audio applications.

The final part of the design is an Android app, which provides remote control over Bluetooth. The source for everything is available on Github, and the detailed build log is available here.

Controlling Chromecast: AirCast APK released

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[Koush] is at it again, this time releasing AirCast, an Android app that’ll push videos to the Chromecast from Dropbox, Google Drive, and your phone’s Gallery. Astute Hackaday readers will recall that AirCast has been around for a few weeks now, but limited to only his whitelisted Chromecast. As [Koush] explains it, he had to reverse engineer the protocols and now he simply avoids the Chromecast SDK entirely. If you’re lucky enough to have a Chromecast, you’ll want to hurry and grab the APK (direct download link) and have some fun with it before it self-destructs. [Koush] isn’t ready to release it for more than a 48 hour period, but we encourage you to take advantage of AirCast and contribute to his call for feedback, bugs, and crash reports. You have a little under a day left.

See “AllCast” work its magic in the video below. No, that’s not a typo. Apparently [Koush] has been struggling with available names for the app, and you’ll hear him call it “AllCast” in the Youtube video. That name was taken for some other product, though, and “AirCast” has now replaced it. If you suddenly regret not immediately ordering a Chromecast and are sitting this one out, go read [Mike's] rant and get psyched up for when they’re back in stock.

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