A touch screen Geiger counter without a Geiger tube


We’re assuming [Toumal] was desperately bored one day, because in the depths of the Internet he found some really cool components to build a solid state Geiger counter.

The Arduino and touchscreen are rather standard fare [Toumal] picked up on eBay for about $30. What really sets this project apart from all the other geiger counter builds we’ve seen is the solid state geiger counter [Toumal] used. This device uses a specially-made photodiode made by First Sensor to detect gamma emissions from 5 to 1000 keV.

[Toumal] put all the software for his Arduino touch screen radiation detector up on github. To be honest, we’re really impressed with the rad sensor [Toumal] used for this project, so if you ever decide to pick one of those up, he’s got your back with an Arduino library for it.

Using Google Authenticator with an Arduino

Google Authenticator is an app that generates one time passwords (OTPs). These passwords are often used as a second factor of authentication, along with your normal password. OTPs work by having a shared secret and a synchronized clock on two devices. When you generate the password, a hash based on the secret and timestamp is created. This proves that you have access to the secret, and can only be used once.

To secure his Lego mini-figures, [Luca] built an authentication system using Google Authenticator and Arduino. A web app is used to generate a secret that can be configured into the Arduino using an array, and into Google Authenticator using a QR code. The Arduino is using a library that implements Time-based One Time Password authentication (TOTP).

There are some challenges, including keeping a good clock source on the Arduino, but this look like an interesting way to do authentication. After the break, watch a quick video overview of the project (for English captions, hit the CC button).

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SNESoIP: It’s exactly what it sounds like


Here’s a cool hack for those of you wishing to play some retro multiplayer SNES games online!

[Michael Fitzmayer] is a resident hacker at shackspace; der hackerspace in StuttgartHe’s come up with this clever little ethernet adapter network-bridge that can share local controller-inputs over the internet. The entire project is open-source, and readily available on github. It’s still in the early stage of development, but it is already fully functional. The firmware is small and will fit on an ATmega8, and by the looks of the component list it’s a fairly easy build.

He’s even integrated a switch mode (hold B and Y during boot), which avoids trying to figure out which controller will be player one! After all, don’t you remember untangling the controller cords, trying to figure out which one is which?

We know you had a favorite controller and would give the other “crappy” one to your guest.

Example video is after the break.

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USB Ableton foot controller reuses old keyboard


No, Hackaday hasn’t started advertising shoes, this is [Matlek’s] foot controller for Ableton Live.

Matlek plays guitar and needed an easy way to control Ableton Live, which he uses as a looper. Ableton normally expects keyboard input, so that’s exactly what he gave it.

An old dell keyboard was gutted down to its controller board. This exposes  the leads the keyboard uses to scan the key matrix.  From there it is simply trial and error connecting different pins together and seeing which keys are printed on the PC screen (A text editor works well for this). Only 8 characters are needed to control the looper, so [Matlek] chose digits 1-8.

Since some of the wires are going to be sharing pins, a small piece of stripboard comes in handy between the buttons and the keyboard controller. [Maltek] used basic momentary push buttons for his mini key matrix, though we think that box looks sturdy enough to support some larger stomp box style buttons.

Everything comes together inside a sturdy shoebox, which also serves to insulate the exposed keyboard PCB from shorting out.

The only major downside to the project is that the box is light enough that it slides easily on the floor when recording or triggering loops. Adding some heavy items (or dare we say, some shoes) would solve this problem. Self adhesive rubber feet on the bottom of the box would help too.

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Repurposing a ceiling fan into a pottery wheel

The wheel goes round and round as does [Lou Wozniak]. He’s come back to us, this time hacking together a pottery wheel from a cheap ceiling fan. This is a great use for a discarded or inexpensive fan and the build should cost less than $50. As you watch the video you learn that repurposing the ceiling fan was no simple feat. Lucky for us [Lou] spins through detailed construction procedures and doesn’t fail to cover every tip and trick. He really does think outside the box or should we say inside the bucket and peanut butter jar. The fan gets dismantled as well as rewired inside a 5 gallon bucket which is used as the pottery wheel housing and stand. A plastic peanut butter jar was used as a makeshift electrical junction box inside the bucket. He remounted the motor’s string operated speed switch on the side of the jar and routed the pull string out the side of the bucket. The fan motor should have three or four switch speed settings which might be enough control. If continuous variable speed control is desired he could add in a controller similar to [Ben Krasnow’s] AC controller using one pin on a microcontrollerUPDATE: [AKA the A] tells us in a comment below that this controller won’t work with a ceiling fan, but we still really like [Ben’s] project so we’re leaving this link here.

Most potters use significant amounts of water to wet the clay while they throw, so we have reservations about having the high voltages and open motor design directly under the wheel with no shielding. We know [Lou] could easily hack in a splash pan and of course always plug into a ground fault protected receptacle when using electrical appliances around water.

We do get to see the wheel in operation at the end of the video, which you can watch after the break. However, [Lou] makes no claims at being a pottery artisan.

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Organizing transistors


Late last year, [matseng] set up an interesting challenge for himself: design a new PCB every week, send it off to a fab house, and build a new project. It’s a grueling endeavor, but some of these projects are actually very useful and cool. One of the best so far is the TraId – a board that identifies a transistor type and pinout with a nice LED interface.

This build was partly inspired by Dangerous Prototypes’ Part Ninja, a board that determines the pinouts and values of transistors, resistors, caps, and diodes. The TraId is a much more cut down version usable only for transistors, displaying the orientation of the pins and type of transistor on a set of 8 LEDs.

Although the design is very sparse, we could imagine something like this being very useful in a hackerspace, lab, or anywhere else the gremlins of chaos come to reorganize parts drawers. If you’d like to build your own, all the required files are up on the gits.