Better Driving With A Bullduino

June 25, 2012 by Brian Benchoff 7 Comments

Despite what you may have heard from the kids hanging out in the parking lot of Taco Bell, there’s a lot to be said about driving conservatively. Not peeling out after ever red light and stop sign does wonders for the life of your engine, and not slamming on the brakes 50 feet away from an intersection will keep your brake pads going a long time. [aromaoftacoma] wanted a dashboard gauge telling him how good of a driver he is, so when he got a bullduino he knew what he had to do.

[aromaoftacoma]’s project for the Redbull creation contest uses the very cool Arduino shield/Redbull logo known as a bullduino with an accelerometer to track how conservatively he’s driving. Quick stops and starts are murder on an automobile – it’s the same reason your grandmother has had the same car for 20 years – so [aromaoftacoma] made a wonderful display using red and blue LEDs behind each charging bull.

Because simply blinking a LED in response to data pulled from an accelerometer is a little boring, [aromaoftacoma] added a servo to change the orientation of the charging bulls. When he’s driving well, the blue bull is tilted up, and when he stops short the red bull becomes the focus of attention. Not a bad build at all.

You can check out [aromaoftacoma]’s build video after the break.

Continue reading “Better Driving With A Bullduino” →

Using The Raspi As An Ethernet Shield

June 24, 2012 by Brian Benchoff 47 Comments

[Alexandre] wanted to set up a web-based temperature logger with his Arduino, but found the Arduino Ethernet shield a little finicky. Since his Raspberry pi was just delivered, he figured he could use the Raspi as an Ethernet shield with just a little bit of coding.

After [Alexandre] set up his Arduino to send a thermocouple through the USB, the only thing left to do was to add node.js to the Raspi’s Debian installation. Every five minutes, the Arduino wakes up, takes a temperature reading, and sends it over to the Raspberry pi. From there, it’s easy parse the Arduino’s JSON output and serve it up on the web.

In the end, [Alexandre] successfully set up his Raspberry pi as an Ethernet shield to serve a web page displaying the current temperature (don’t F5 that link, btw). One interesting thing we have to point out is the cost of setting up this online temperature logger: the Arduino Ethernet shield sells for $45 USD, while the Raspberry pi is available for $35. Yes, it’s actually less expensive to use a Raspberry pi as an Ethernet shield than the current Arduino offerings. There you have it, just in case you were still on the fence about this whole Raspi thing.

Red Bull Creation Hardware (Bullduino) Arrives

June 23, 2012 by Mike Szczys 28 Comments

The Bullduino’s are starting to arrive. When [Arclight] received his in the mail the first thing he did was to share the hardware details. Of course this is the hardware that participants in the Red Bull Creation contest will be receiving ahead of this year’s contest.

The board is an ATmega328 Arduino clone. Instead of an FTDI chip for USB this one is sporting an ATmega8u2. That’s not too much of a surprise as it should translate to a cost savings. [Arclight] reports that the stock firmware flashes a message in Morse code. It seems the Harford HackerSpace got their Bullduino several days ago and already decoded the message. It reads:

“Wouldn’t lou prefer a good game of chess?”

The guys that did the decoding speculate that this could be a type as ‘l’ and ‘y’ are inversions of each other in Morse code; or it could be some kind of clue. At any rate, if you want to do some disassembly and see if there’s anything lurking in the firmware, [Arclight] posted FLASH and EEPROM dumps from both ATmega chips along with his article.

Driving A Nokia QVGA Screen With Arduino (or Any UC)

June 20, 2012 by Mike Szczys 14 Comments

This is a Nokia 6300 screen. It’s a 320×240 display that has about 2″ of diagonal viewing area and boasts 24-bit QVGA TFT technology. It’s going to look fantastic in your next project and it won’t be hard to get up and running thanks to the hardware and software guide which [Andy Brown] put together. He chose this display because of its features, but also because it’s really easy to source and can be had for $5-7 delivered. The guide is aimed at working with the Arduino MEGA, but we’re sure you can port it for just about any microcontroller you’d like.

Much like the FPGA PSP display we just looked at, [Andy] chose to design his own PCB to host the LCD. This makes it a snap to attach the LCD — literally, since he managed to source the correct snap-in connector. The board also hosts a constant-current LED driver which takes care of the backlight, and allowed him to build in a level converter (since the screen communicates at 3.3V but Arduino uses 5V logic).

The software tutorial is lengthy but impressive. We’re surprised at the performance he gets out of the AVR chip. See the screen cycle through a set of demos after the break.

Continue reading “Driving A Nokia QVGA Screen With Arduino (or Any UC)” →

Putting Scores Of Arduinos On The Internet With One Router

June 18, 2012 by Brian Benchoff 10 Comments

Like many hackers of late, [Rick] has been experimenting with connecting Arduinos to the Internet with a disused WiFi router and an installation of OpenWRT. Unlike his fellow makers, [Rick] thought it would be wasteful to dedicate a single router to one Arduino project, so he used a small, low power wireless module to connect up to 30 Arduinos to the Internet.

Just as in a few recent builds (1, 2), [Rick] found an old Fonera router sitting in a box at his local hackerspace. After installing OpenWRT, [Rick] connected a very small wireless module to the router’s GPIO pins and patched the firmware to put an SPI bus on the router.

Now, whenever [Rick] wants to connect an Arduino project to the Internet, all he needs is a $4 radio module. This radio module connects to the router, and the router handles the networking requirements of up to 30 DIY projects.

If you’re looking to build an Internet-enable sensor network, we honestly can’t think of a better or cheaper way of going about it. Nice job, [Rick].

ArduSat Puts Arduino Experiments In Space

June 15, 2012 by Brian Benchoff 30 Comments

CubeSats are nothing new – hundreds have been launched into Earth orbit by schools and universities over the past decade. Like anything cool, an Arduino eventually gets thrown into the mix. That’s what the folks behind ArduSat are doing: they’re launching an Arduino-laden satellite into orbit with a bunch of sensors to enable anyone to become a citizen space scientist.

On board the ArduSat is a suite of sensors including a spectrometer, Geiger counter, IR light sensor, electromagnetic wave sensor, a temperature sensor, gyroscope, accelerometer, magnetometer, GPS unit, CO2 sensor, and of course a few cameras. The rewards for this Kickstarter are fairly interesting: backers who pledge $500 are able to buy a week’s worth of time using the ArduSat sensors for your own personal experiment.

As for how this Arduino-powered satellite is getting a ride up to Low Earth Orbit, the team plans to send an application into NASA for the CubeSat Launch Initiative ride-along program. If NASA selects the ArduSat, it’ll get a ride into space along with other CubeSats on a larger commercial launch. If the ArduSat isn’t selected by NASA, the team behind this satellite has secured funding to piggyback on a commercial launch.

Tip ‘o the hat to [HackTheGibson] for sending this in.

Using Printf-style Output To Debug Arduino

June 14, 2012 by Mike Szczys 21 Comments

First off, if you’re looking at that title and thinking it’s flame-bait, please hold off. What [Ihsan Kehribar] is working with is another way to get some feedback for what’s going on with your Arduino project. Or really any AVR project that uses an ISP connection. He’s added text output for AVR programs similar to the printf function used for a lot of non-embedded C development.

So, we’d bet you’re asking yourself why he’s not just using outright debugging? The AVR line supports many different types of it. But that can be complicated, and usually requires a proper programmer. If you just want to watch to see what values are changing, and when functions are being executed, this isn’t a bad solution. He uses the computer to continually poll the chip. Whenever the sketch calls the his print library it answers back with the payload to be displayed in the terminal. The overhead shouldn’t be too high, and if you’re smart about it this can be flagged as a debug option at the top of the program file.