Wiimote Controlled Extermination: Dalek-Style

Dalek Build

Convention-goers have likely strolled past a number of Daleks: the aliens drive around the event space, spouting threats of extermination and occasionally slapping folks with a rotating eyestalk. [James Bruton] has been hard at work building this Wii-remote-controlled Dalek with his fellow hackers at the SoMakeIt Hackerspace (you may remember our write-up from earlier this year).

Most Dalek builds seat a driver inside the body at the helm of a salvaged electric wheelchair, where they plunk around using a joystick control and simmer in an increasingly potent aroma. This version started like most, with a wooden structure from plans sourced at Project Dalek. Inside, however, [James] and his crew have tapped into the wheelchair’s motor controller to feed it a PWM signal from an Arduino Shrimp, which is linked to a Raspi. The Pi receives a Bluetooth signal from a Wiimote, and, through their custom Python script, directs the Dalek with ease.

They’re still working on finishing the Dalek’s body, but they’re using some clever tactics to push onward: using a 3D-printer to solve some of the nuanced styling choices. They’ve uploaded a gallery with additional photos on Facebook, and you can watch them goofing around with their creation (losing their balance and nearly exterminating themselves) in a video after the break.

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HAL is Duct Tape for Home Automation

HAL Home Automation

When it comes to home automation, there are a lot of different products out there that all do different things. Many of them are made by different companies, and they don’t often play very well together. This frustration ultimately led [Daniel] to develop his own Python based middleware solution to get these various components to work as a single cohesive system. What exactly did [Daniel] want to control?

First up was the door lock. [Daniel] lives in an apartment building, so there are actually two locks. First, a visitor must be allowed into the building by pressing a button on the intercom system in the apartment. Second, the apartment door has its own dead bolt lock that needs to be opened and closed. [Daniel] was able to control the building’s front door using just a transistor hooked up to an Arduino to simulate the press of the physical button. The original button remains in tact so [Daniel] can still easily “buzz” in a visitor.

The apartment’s dead bolt was a bit trickier. There are off-the-shelf solutions to control a dead bolt, but they are often expensive. [Daniel] built his own solution using a simple servo motor bolted to the door. The servo is controlled by the Arduino which is in turn controlled via two broken intercom buttons that already existed within the apartment. The buttons were originally used to either speak to or listen to a visitor before buzzing them into the building. They had never worked for [Daniel] so he re-purposed them for his own project. The whole DIY door locker is enclosed in a custom-made laser cut wooden box.

Click past the break for the rest of [Daniel's] story.

[Read more...]

Never Miss a Thing With This Programmable Vacuum Fluorescent Display Ticker

VFD Ticker

[Coyt] wanted a more convenient way to keep up to date with the ever-changing Bitcoin exchange rates, as well as weather and other useful information. He realized that the vacuum fluorescent display (VFD) he had purchased a couple of years ago would be perfect to display small amounts of information.

[Coyt] discovered that the VFD had a serial interface. The problem was that the VFD was looking for a 12V serial signal but the Raspberry Pi he wanted to use runs at a 3.3V. Upon closer inspection [Coyt] discovered that the VFD actually ran at lower levels as well, but it had a level converter chip installed in front of the main connector. He simply bypassed the level converter and was then able to get the RasPi speaking directly to the VFD.

The brain running this display is a Raspberry Pi. The Pi runs a Python script that pulls down all of the relevant information from the internet and displays it on the VFD. [Coyt] didn’t stop there, though. He knew that having the screen on all of the time would be somewhat of a waste, so he hooked up a PIR sensor to automatically turn on the display only when needed. The PIR sensor can detect motion in the room and will disable the display after a set period of inactivity. Most of this is powered by an LM7805 voltage regulator. While [Coyt] admits a linear regulator is not his ideal solution, it does get the job done. The metal stand acts as a nice heat sink for the regulator.

[Coyt] also wanted his project to have a certain aesthetic. He started by bending a metal plate into a stand for the electronics. He then mounted the VFD on the front of the stand and the RasPi on the back. He also mounted green LEDs between the two plates to light up the edges for a little extra pizzazz. [Coyt] believes he can use the RasPi to PWM the LEDs but this has not yet been implemented. This would allow him to pulse the light for added effect.

Since the whole thing is run by a Python script, it would be trivial to modify it to display other kinds of information. What would you do if you had a motion sensitive automatic ticker?

 

Rackmount RasPi Leaves No Excuse to Lose Data

RasPi backup server

[Frank] knows how important backups are for data security, but his old method of plugging a hard drive in to take manual backups every so often is not the most reliable or secure way of backing up data. He realized he was going to need a secure, automated solution. He didn’t need a full-sized computer with a ton of power; why waste electricity for something so simple? His solution was to use a Raspberry Pi as the backup computer.

The main problem he faced with the Pi was finding a way to make it rack mountable. [Frank] started with an empty 1U server case. He then had to bend a few metal plates in order to securely mount the backup drive into the case. A couple of small rubber pads help dampen any vibrations caused by the hard drive.

The computer power supply was able to put out the 12V needed for the hard disk, but not the 5V required to run the Pi. [Frank's] solution was to use an LM2596 based switching supply to turn the 12V into 5V. He soldered the power supply wires directly to the Pi, thinking that a USB plug might vibrate loose over time. Mounting the Pi to the computer case should have been the trickiest part but [Frank] made it easy by simply gluing the Pi’s plastic case to the inside of the computer case. When all was said in done, the backup server pulls 29W under full load, 9W with the disk spinning, and only about 2W in an idle state.

On the software side of things, [Frank's] backup box uses bash shell scripts to get the job done. The Pi connects to his main server via VPN and then the bash scripts use rsync to actually collect the files. The system not only saves backups every night, but also keeps week old backups just in case. If you are really paranoid about your backups, try hooking up a custom battery backup solution to your Pi. If a Pi just isn’t doing it for you, you can always try one of many other methods.

Oinker is Twitter for HAMs

oinker

Have you ever wanted to send a quick message to your HAM radio buddies over the air but then realized you forgot your radio at home? [Troy] created Oinker to remedy this problem. Oinker is a Perl script that turns emails into audio.

The script monitors an email account for new messages and then uses the Festival text-to-speech engine to transform the text into audio. [Troy] runs Oinker on a Raspberry Pi, with the Pi’s audio output plugged directly into an inexpensive ham radio. The radio is then manually tuned to the desired transmit frequency. Whenever Oinker see’s a new email, that message is converted into speech and then output to the transmitter.

The script automatically appends your HAM radio call sign to the end of every message to ensure you stay within FCC regulations. Now whenever [Troy] runs into some bad traffic on the road, he can send a quick SMS to his email address and warn his HAM radio buddies to stay clear of the area.

The Raspberry Pi Compute Module

Raspi

Raspberry Pi cluster computers are old hat by now, and much to our dismay, we’ve even seen Raspberry Pis crop up as the brains of a few ill-conceived Kickstarter projects. The Pi was never meant for these applications, with the very strange port layout and a bunch of headers most people don’t need. The Raspberry Pi foundation has a solution for the odd layout of the normal, consumer Pi:  The Raspberry Pi compute module, a Raspi and 4GB flash drive, sans connectors, on an industry standard DDR2 SODIMM module.

This isn’t something you can plug into your laptop (yet; that’s just a BIOS hack away, right?), but the new format does allow for some very interesting projects. All the normal Raspi I/O – CSI and DSI ports, USB, HDMI, JTAG – and a whole bunch more GPIO ports – are broken out onto an I/O board for development. The idea is that anyone can develop a product for the Raspberry Pi, create a custom board with a SODIMM connector, and use the compute module as the brains of their project.

The compute module should cost about $30/piece in quantity 100, available in June. No word yet on how much the I/O board will cost, but we expect a few open source expansion boards to crop up shortly so anyone can create a very cool cluster computer based on the compute module.

 

WS2812b Ambilight Clone For The Raspi

Raspi

For how often the Raspberry Pi is used as a media server, and how easy it is to connect a bunch of LEDs to the GPIO pins on the Pi, we’re surprised we haven’t seen something like Hyperion before. It uses the extremely common WS2812b individually controllable RGB LEDs to surround the wall behind your TV with the colors on the edges of the screen.

One of the big features of Hyperion is the huge number of LEDs it’s able to control; a 50 LED strip only eats up about 1.5% of the Pi’s CPU. It does this with a “Mini UART” implemented on the Pi running at 2MHz.

There’s only one additional component needed to run a gigantic strip of RGB LEDs with a Pi – an inverter of some sort made with an HCT-series logic chip. After that, you’ll only need to connect the power and enjoy a blinding display behind your TV or monitor.

Thanks [emuboy] for sending this one in.

 

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