Turning A Phone Into A Geiger Counter

geiger

We’re no stranger to radiation detector builds, but [Dmytry]’s MicroGeiger prototype is one of the smallest and most useful we’ve seen.

The idea behind the MicroGeiger comes from the observation that just about every modern smartphone can provide a small bit of power through the microphone jack. Usually this is used for a microphone, but with the right circuit it can be stepped up enough to power a Geiger tube.

[Dmytry]’s circuit uses a hand-wound transformer but keeps the part count low; there’s only a few dozen caps, resistors, and diodes in this build, making the circuit much smaller than the Geiger tube itself.

Since [Dmytry] is powering a Geiger tube with a phone, it only makes sense that he should also record clicks from the tube with an Android app. Right now, the entire project is still in the prototype stage, but everything works and his app can detect radiation from one of [Dmytry]’s sources.

The code and schematics for the MicroGeiger are available on GitHub, with a video of the project in action below.

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Wireless Rover With Android Control

android-rover

[Radu] spend the first portion of this year building and improving upon this wireless rover project. It’s actually the second generation of an autonomous follower project he started a few years back. If you browse through his old postings you’ll find that this version is leaps and bounds ahead of the last.

He purchased the chassis which also came with the gear-head motors and tires. Why reinvent the wheel (har har) when you’ve got bigger things on your plate? To make enough room inside for his own goodies he started out by ditching the control board which came with the Lynxmotion chassis in favor of an AVR ATmega128 development board. He also chose to use his own motor controller board. Next he added a metal bracket system to hold the battery pack. Things start to get pretty crowded in there when he installed his own Bluetooth and GPS modules. Rounding out his hardware additions were a set of five ultrasonic sensors (the grey tubes on top), a character display, as well as head and tail lights. The demo video shows off the control app he uses. We like that tic-tac-toe design for motion control, and that he added in buttons to control the lights.

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Android Pen Plotter Snaps, Processes, And Prints Pictures

android-pen-plotter

Here’s an Android powered pen plotter that does it all. It was built by [Ytai Ben-Tsvi] to take with him to Maker Faire. He’s the creator of IOIO, a hardware interface module designed to communicate with an Android device via USB (host or OTG are both supported).

The physical hardware is simple enough. He draws on a pad of white paper using a felt-tipped marker. Located at the top of the easel are two wheels with stars etched on them. They are reels which spool and dole-out string to control the pen’s movements. The pen tip can be lifted by a ball bearing mounted just below it.

But the project really takes off when you watch [Ytai’s] demonstration. The Android tablet controlling the device captures a picture of an object — in this case it’s a toy truck. The app then processes it using edge detection to establish how to plot the image.

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External Pinball Controls For An Android Tablet

android-pinball-controls

This hack, which adds external flipper controls to Android pinball, is a great way to cut your teeth at Android hardware hacking.

[Ruben] decided to go with the TI Launchpad for this project. The MSP430 dev board offers serial communications via a USB connection, but it’s not quite as easy as just finding the right cable. His tablet does support USB On the Go (OTG), but the board identifies itself as an ACM device which needs to be handled differently. In order to get the tablet talking to the Launchpad he compiled a CDC_ACM module for the Linux underpinnings that make up every Android OS. In this case the module is tailored for the Allwinner A10 chip inside his model of tablet, but it shouldn’t be too hard to adapt his guide for other processors.

Of course you could go a different route and use Bluetooth for connectivity. We’ve seen several gaming peripherals that use this technique with Android devices.

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ODB-II Hacking Using An Android Tablet

What a strange message to read on the digital dashboard display of your car. This is proof that [Kristoffer Smith] was able to control the ODB-II bus on his Eagle Grand Cherokee.

He’s not just doing this for the heck of it. It stems from his goal of adding an Android tablet on the dashboard which has been a popular hack as of late. This left [Kristoffer] with steering wheel controls that did nothing. They originally operated the radio, so he set out to make them control the tablet.

He had seen an Arduino used to control the CAN bus, but decided to go a different route. He grabbed a USB CAN bus interface for around $25. The first order of business was to use it with his computer to sniff the data available. From there he was able to decode the traffic and figure out the commands he needed to monitor. The last piece of the puzzle was to write his own Android code to watch for and react to the steering wheel buttons. You can check out the code at his repository and see the demo after the break.

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Ask Hackaday: Are We Close To Reinventing The Keyboard For Touchscreens?

minuum-keyboard

We mourn the loss of the physical keyboard with the advent of tablets. After all, we do a bit of typing getting all of these features posted throughout the week. And we kind of blame tablets for the decline of the netbook industry (we still use a Dell Vostro A90 when not at home). But we’re trying to keep an open mind that we may not need a physical keyboard anymore. If someone can come up with an innovative alternative to the Qwerty layout that we are able to learn and can use with speed and without physical strain we’ll be on board. Our question is,  do you think we are close to a screen typing breakthrough?

This question came to mind after seeing the Minuum keyboard shown above. It compresses all of the rows of a Qwerty into a single row, monopolizing less screen space than conventional smartphone input methods. The demo video (embedded after the break) even shows them hacking the concept into a distance sensor and using a graphite-on-paper resistor. Pretty cool. But what happens when you type a word not in the dictionary, like this author’s last name?

You can actually try out the Minuum style thanks to [Zack’s] in-browser demo hack. He’s not affiliated with Minuum, but has done quite a bit of alternative keyboard input work already with his ASETNIOP chorded typing project. It’s another contender for changing how we do things.

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Android Controlled Minecraft Ores

[Ryan] has a friend with a birthday coming up, and being inspired by ever 12-year-olds favorite game, he decided to make a Minecraft ore block with RGB LEDs. The block can change from diamonds to emeralds via commands send from an Android phone.

After a few false starts, [Ryan] eventually had his ore cube laser cut at Acess Space, a hackerspace-ish group in Sheffield. The box was constructed out of 3mm MDF, while the windows were laser cut out of frosted acrylic, while the stone pattern on the cube is one giant custom-made sticker.

With the tedious part of the build out of the way, [Ryan] set to work on the electronics. He used a PIC attached to a few very large RGB LEDs, and a Bluetooth module that allows him to connect his phone to an ore block. Dialing in the right colors took some work, but eventually, [Ryan] had an Android-controlled Minecraft ore block, able to transmutate between gold, iron, diamond, emerald, lapis, and redstone.

You can check out a video of [Ryan]’s ore block in action after the break.

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