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Arduino Archive: Arduino

Arduino Home | Next >

July 28, 2009

Frequency counter library for Arduino

Here's a great example of what makes the Arduino platform so great. In need of a basic frequency counter on the quick, I dug up some code & schematics based on the ATTiny2313. But just before breaking out my programmer + protoboard, I thought to have a look Arduino.cc in case someone had written similar code for Arduino. Lo and behold - Martin Nawrath's Frequency Counter library was but a few clicks into the site's playground section. I had the setup up and running in no time with the Arduino IDE's serial monitor - and after a few small changes to the code, had it playing nice with a serial display. There's also an ArduinoMega-compatible version of the library's cpp file available here.

More:

How-To: Build a frequency meter

Motion Plus and Nunchuck together on the Arduino

It looks like the Wii Motion Plus has been hacked so you can read the data via an Arduino. The build only requires about $4 in parts. Now that's cheap! Check out the website for the schematics, code, and more information.

Alright, one great aspect about the Wii Motion Plus is its pass through port for other extension controllers such as the nunchuck. Unfortunately, no one has been able to read both an active motion plus and any other controller at the same time because they are all on the same I2C address(smooth nintendo). This is creates a large hurdle to people like myself who bought the WM+ to create a low cost IMU with it and the accelerometer in the nunchuck. After a good deal of digging and very little luck, I did find a way to use both at the same time(though not through the pass through port). And best of all its cheap!

More about Motion Plus and Nunchuck together on the Arduino [via Arduino.cc]

In the Maker Shed:

Arduino Family

Make: Arduino

July 27, 2009

Arduino in space!

Soon to be deployed as part of the Atmospheric Neutral Density Experiment test program, the Pollux satellite carries student-designed payloads built with Arduino -

Westfield High School accelerometer payload: This payload uses the Atmega16 microcontroller and measures the voltage of three SCA610 accelerometers made by VTI Technologies. The accelerometers will be used to detect rotation in three axis. Software was developed using the Arduino software which makes programming in C/C++ easy.

Marshall Academy gyroscope payload: This payload also uses the Atmega16 microcontroller and Arduino software. The payload collects the rotation rate and temperature from each of the three Melexis MLX90609 gyroscopes. The 75 degree/sec version was selected to support measuring rotation rates up to 12.5 rpm.

Federation of Galaxy Explorers Gyroscope payload: This payload also uses the Atmega16 microcontroller and Arduino software. The gyroscopes are Analog Devices ADXRS401 75 degree/sec devices. Also included in the payload is the PNI Corp. MicroMag3 3-axis magnetometer.

(I'm guessing they meant to say "ATMega168", instead "ATMega16" ?) Read more on the project on the Stensat Group's site. [via Arduino Blog]

In the Maker Shed:

Arduino Duemilanove

BeatSneaks - MIDI sneakers

MAKE subscriber Tom, of Hobgob Electronics, writes:

I thought you guys might like to check out my latest project. It's a pair of musical MIDI-enabled sneakers. You can use them to trigger sounds/samples, or control pretty much anything that you can connect to a computer or Arduino. It's a relatively straightforward project, and has tons of potential for expansion and modification.

Musical MIDI Shoes

July 25, 2009

Toys for Bots - Arduino controlled etch-a-sketch

Ardimage

yergacheffe writes -

I had recently purchased a pair of 5V stepper motors and a motor driver shield from the fine folks at adafruit industries which seemed perfect for spinning the knobs. The question was how to connect the steppers to the knobs. As it happens I had also just bought a gear set from American Science & Surplus on a lark and they fit perfectly on the Etch A Sketch shafts and the stepper shafts. So I simply needed a way to line up the steppers over the knob gears.
There are few problems you’ll encounter in life that can’t be resolved with the judicious application of a laser beam. I drew up a set of parts in Corel Draw and popped in to TechShop to cut them out of acrylic with their Epilog laser cutter.

I cut most of the parts out of clear acrylic except for the side guides which you can see in blue acrylic. The side guides hold the Etch A Sketch in place so it doesn’t move around laterally.

Arduino-controlled firewood cutter/splitter

A month or so ago at the dump, I helped Michael harvest the optical sensor out of a skiing machine just as closing time descended upon us. As we got hustled away from the picking pile, he mentioned that he needed it to make a speed governor for a wood cutting and splitting machine. A few days later, Michael turned up at school to show me the breadboarded version of the circuit. He had all the basics in place, the code and mechanisms were working properly and predictably. Next step was to formalize the design and install it on the automatic log splitter.

Initially throttle position was held constant by holding the throttle body against a hard stop. Throttle position was selected for reasonable loaded performance and safe unloaded operation.See https://www.youtube.com/watch?v=np9l8YD36d8 for a video clip of the wood processor in fixed throttle mode. As expected, the engine tends to bog down during heavy loads.

Check out Michael's page on the project for more photos, videos and the Arduino code.

In the Maker Shed:

Arduino Duemilanove

July 24, 2009

Open Softwear e-book released

We're excited to learn of the release of this free, 104-page PDF book dedicated to physical computing via soft circuits, or "softwear." The book starts with a basic intro to the hardware and software involved, goes into basic projects, such as button and soft switches, and then delves deeper into what can be done with things like touch-sensitive embroidery and controlling a servomotor via a zipper.

The authors hope the book will serve as a starting point for professionals and educators who will feed back what they learn in the field to help grow and refine the book. Looks like they're off to a decent start.

Open Softwear: Download the book [via https://www.adafruit.com/]

In the Maker Shed:

9780596514372-2T
Fashioning Technology
Ready to take your craft projects to the next level? With "smart" materials, unorthodox assembly techniques, and the right tools, you can create accessories, housewares, and toys that light up, make sounds, and more.

July 22, 2009

How-To: All-breadboard shield for Arduino

MAKE subscriber John Honniball points out this interesting take on the proto shield design. o0mouse0o's recipe for a "Large Prototyping Shield" consists mainly of breadboard - plus a few headers, and some stripboard.

Having recently become an Arduino fan I want to be able to have several projects but save the expense of buying more than one Arduino board. Being very lazy I would also like to be able to change between several projects and avoid all the tedious swapping around of many dangly wires and all the trouble caused when you get the order wrong or cant remember how it went together.

All the available prototyping shields I've seen are small and I want something that a whole project can be built with so I solved the problem by making a Large Arduino Prototyping Shield

Of course you could use a larger breadboard - maybe even hardwire the power connection below as well. Check out the step-by-step in the project's instructable.

In the Maker Shed:

Half-Size Breadboard

Temporary Music Machine powered by an Arduino

The Temporary Music Machine is just as its name implies. It's meant to be used for only a limited amount of performances, and then the parts are reused for another project. The machine works by using two binary counters controlled by the performer. These counters are then mapped to chord structures and drum sequences.

The device is only intended to be temporary. A handmade bespoke electronic musical instrument for a limited number of performances. It is based on the Arduino platform and realised through an iterative rather then planned process.

More about the Temporary Music Machine powered by an Arduino

In the Maker Shed:

Arduino Family
Make: Arduino

July 21, 2009

DIY Arduino LCD backpack

From the MAKE Flickr pool

Bryan "linux-works" Levin built this Arduino compatible LCD backpack -

all the wiring needed to connect the LCD, the IR input module, power, lcd contrast, pwm-based dimming and a 6pin FTDI style usb serial header for upload of new firmware.

the IR module is in silver (left) and was a very old radio shack module.

the 6 pin header is via the wire harness; it was hard to solder the 6 pin header 'in reverse' on this kind of single sided board and this board is not very strong (the header could lift off the board with enough unpluggings). so my solution was to use the wire, itself, as a strain-relief.

this cable also is an easy way to give the circuit power (5vdc).

More project pics available in his Flickr photostream.

PianoDuino

This is an interesting musical interface called the PianoDuino. It uses the SoundCipher library for Processing and an Arduino to create interactive sound. Check out the web site for a little more information, and all the code needed to build your own.

PianoDuino is a simple experiment that integrates Arduino, Processing and a library to manipulate sounds, the SoundCipher. The idea was to try the Multiplexer / demultiplex 4051.

More about PianoDuino [untranslated]

In the Maker Shed:

Arduino Family
Make: Arduino

July 20, 2009

Virtual Gravity - the physical weight of data

Silke Hilsing created an imaginative interface to talk between the digital and analog world.

Virtual gravity is an interface between digital and analog world. With the aid of analog carriers, virtual terms can be taken up and transported from a loading screen to an analog scale. The importance and popularity of these terms (data base: Google Insights for Search), outputted as a virtual weight, can be weighed physically and compared. Therefore impalpable, digital data get an actual physical existence and become a sensually tangible experience.

The knowledge, that human beings also connect with a physical mass things like importance, power and influence allows the reverse that virtual things which are particularly asked and own a high popularity, would have to be heavier than others which attract less attention. Thereof results a virtual weight which can really affect the physical reality and becomes measurable and comparable.

You can read more about her project here.

July 17, 2009

Arduino refrigerator alert system

What do you do if your kids are always leaving the refrigerator door open? Make a scrolling Arduino powered sign of course! It may be a bit overkill, but it's hard to miss the large format LED matrix scrolling in front of you. Next step, ~~shock~~ audio alert!

We have 5 kids in our household, and with that someone is always leaving the refrigerator door open. So we set out to built this next Arduino project so that when the door is left open, the LED panel will activate as a reminder to check and close the door.

Check out what he used to sketch his ideas on. Yep, it's a Maker's Notebook!

More about the Arduino refrigerator alert system

In the Maker Shed:

Arduino Family

Make: Arduino

July 16, 2009

Arduino on 64-bit Linux

Matt Mets writes:

After bemoaning the lack of a 64-bit version of the last few Arduino releases, and the subsequent hoops that had to be followed to make the 32-bit version work in Ubuntu, I finally decided to get off of my laurels and just build the thing. You can get the package here, or read on to build your own.

Over at Adafruit there's a quick hack to get Arduino 16 working with a recent OS X Java update, if that's your flavor.

Image above is from Linux Planet.

In the Maker Shed:

Arduino Family

Make: Arduino

GBA touch-screen mod

Like some piece of gaming tech from an alternate timeline - an anonymous reader points out this vid of a touch-screen ~~NDS~~ GBA made possible via the power of Arduino.

Breath-over-IP

My friend Thomas Edwards has added another component to his Phy2Phy project series, his mission to link one physical locale to another over the Internet. His first component was Touch-over-IP. His latest creation is Breath-over-IP.

To communicate breath over the net, he used an Arduino, a SparkFun Protoshield, an AdaFruit Xport shield, and a Lantronix Xport Direct for the control and communications modules. For the fans, he used Kestrel anemometer impellers housed in FastSteel. The breath sensor is composed of a side-looking NTE 3029B IR LED and a NTE 3034A IR Phototransistor detector. For the package on "the other side," which he plans to send "all over the planet," he mounted the impeller and IR LED/phototransistor sensor inside a piece of PVC pipe and JB Welded the pipe on top of the fan. The pipe is long enough so that the wind from the fan doesn't make the impeller spin.

At the September 2007 Dorkbot DC, we tested Thomas' Touch-over-IP, with our group in DC and Thomas on the West Coast. It was amazingly... touchy. It really did feel like you were having a physical interaction with someone thousands of miles away, on the other end of the wire. Very cool. I wonder if Breath-over-IP is similarly effective.

Breath-over-IP
The Phy2Phy Project site

July 15, 2009

Arduino ISP Shield

From the MAKE Flickr pool

Flickr member drug123's MEGA-ISP shield turns an Arduino into an In-System Programmer for AVR Chips -

Prepared schematics and board layout of this Arduino shield during one-hour-long phone call. Spent another hour to create "physical interpretation".
Purpose of this PCB is providing ISP header to turn Arduino in full-functional programmer for AVR microcontrollers.
Firmware to turn your Arduino board into ISP programmer can be found here.
Connected device could be seen here.
All components on PCB were scavenged from old dead LAN cards.
I have released schematics for improved version of this board under CC BY-NC-SA license, you may find it here.

This could prove quite helpful as a backup for my USBTiny - I'll have to give it a go myself.

More:

HOW TO - use Arduino as a high voltage programmer

Team Twiizers DSi Haxx

Team Twiizer is able to inject custom graphics onto a DSi via an Arduino. There isn't a lot of information about this hack yet, but the teaser video is really cool. I'll post more about this project when the details are unveiled.

A full week of hacking is finally giving us some fruitful results. Enjoy this small tiizer video, and stay alert for what's yet to come! :)

A little more about Team Twiizers DSi Haxx

In the Maker Shed:

Arduino Family
Make: Arduino

July 14, 2009

Record and playback library for WaveShield

The WaveRP library makes audio recording possible with Arduino(ATMega328), WaveShield + simple mic preamp circuit -

WaveRP is an Arduino library for recording and playing Wave files with the Adafruit Wave Shield. It records 8-bit mono files at 4,000 to 44,100 samples per second. Use of the Wave record/play library, WaveRP, requires the following:

Arduino with a 5 volt 328 processor.

Low noise power source such as a nine volt DC adapter or battery.

Adafruit Wave Shield (version 1.1 is best but 1.0 works)

Microphone preamp. A circuit for a simple preamp is included in the documentation.

Microphone, PC type with 3.5 mm plug. See the documentation for details.

SD/SDHC formatted with 32KB allocation units.

[via Adafruit Industries]

In the Maker Shed:

Arduino WaveShield Kit

Arduino learns to speak!

Peter points out the release of the Cantarino speech synthesis library for Arduino - demoed above in an endearing rendition of "Daisy".

An interrupt on the PWM output timer calls a sample generator. This uses a synthesis similar to FOF or granule synthesis - using two sines and a square wave of adjustable pitch and amplitude, synced and enveloped by a pitch of selectable frequency. Phase modulation is added to the pitch, to allow unvoiced phonemes to be uttered.

As the Google code page explains, it's still a work in progress but sounds rather impressive considering it uses only PWM output from a single pin!

More:

Controlling a speech IC via Arduino

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