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Real-Time Audio Synthesis and Effects with the Arduino. A great tool for the exploration of new sounds and signal processing.
Real-Time Audio Synthesis and Effects with the Arduino. A great tool for the exploration of new sounds and signal processing.
Real-Time Audio Synthesis and Effects with the Arduino. A great tool for the exploration of new sounds and signal processing.
227 backers pledged $7,859 to help bring this project to life.

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Arduino Digital Signal Processing Shield. DIY sound effects!

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Rewards from this Kickstarter project are now available from:
http://www.docjava.com

Thank you all so much for making this project a success!
- Doug

Introducing the Arduino DSP Shield: An Arduino compatible shield with sample sketches for doing audio processing and synthesis.

Shield has: 

  • an audio input, 
  • an audio output, 
  • a programmable control pot

Two A Light Dependent Resistors (LDR), based on cadmium sulfide (CdS). Cadmium pigments based on CdS became commercially available in the mid 1800's and were used in paint by Van Gogh, Monet and Matisse. Now you can use CdS cells too, for those MOST excellent LDR experiments

 The shield includes two gold plated adapters, go in from a headphone jack, output to a stereo.

“In truth, the gold standard is already a barbarous relic.” -Monetary Reform (1924), p. 172, John Maynard Keynes . 

Just imagine how jealous your economist friends will be when they see this fine barbarous relic!

So there, John Maynard Keynes!

Sample sketches include:

  • 1. Audio oscillator (stable, and precise function generation)
  • 2. Echo (longer than 30ms delay)
  • 3. Reverb (shorter than 30ms delay)
  • 4. Phaser effect 
  • 4. Ring Modulation (sound like a Dalek!)
  • 5. Complex Tone generation

All elements are adjustable through the fully programmable potentiometer

Here is a finished board seen from all sides on a turntable;

 3D modeling program was used to make sure that the board would stack cleanly under or on top of other shields, with full side access to both jacks, trim pot and programmable control pot. 

Stable test tone from shield
Stable test tone from shield
3D Image From Our CAD Tool
3D Image From Our CAD Tool

3D modeling program was used to make sure that the board would stack cleanly under or on top of other shield, with full side access to all jacks and controls. With the supplied software, it is a snap to program with the arduino IDE.

It is small and cheap enough to use for:

  • teaching signal processing,
  • very fun sound effects,
  • unique music processing,
  • guitar effects,
  • like, totally custom effects boxes,
  • function generator,
  • telecommunications, etc.

This can be a building block for inexpensive real-time signal processing and synthesis applications. It is even low power, so you can power it right off your usb port. You can plug this into an embedded application to measure sound remotely.

I am so excited by this project because it has exceeded all my expectations;

Here is what you can do with the shield using the supplied software:

  • 1. Function generator 
  • 2. Phasor 
  • 3. Ring Modulator 
  • 4. Echo 
  • 5. Reverb 
  • 6. Guitar Effects 

These are only a small sampling of what the DSP Shield can do.
The possibilities are endless. I feel sure people will use these things for stuff we never thought of.

Where we are NOW:

The latest production run of 10 boards can be seen here and this is fully functional and tested:

Ten Tested and Working Prototypes
Ten Tested and Working Prototypes

The Production Plan:

  • Boards are fabricated in China.
  • Parts are available from Mouser Electronics, USA.
  • A contract assembler is in Milford CT, USA; 

WHY WE NEED THE MONEY: The Goal amount will go directly to producing the first production run of the Shields. With volume production, we can keep costs low.

WHY YOU NEED THIS BOARD: Stop having to breadboard your own I/O circuits and select an easy-to-use engineered and professional solution.

Well kickstarters, We need your help!
In order to bring this shield, at a low price, to the arduino community we have
to have at least 100 boards on our initial order.

Blog the Blogs. Tweet the Tweets.

FIGHT the FACEBOOK LIKE with FACEBOOK LOVE.

Back us today and get yourself some DSP Shields.

Thanks for watching our video and for your backing!
Thank you! Thank you! Thank you!

---- Who is this guy anyways?

Doug Lyon is chairman of the Computer Engineering Department at Fairfield University, Fairfield, Connecticut. Dr. Lyon has written three books (two related to signal processing). He is doing this project to learn enough about engineering entrepreneurship in order to teach his students. He is also the president of the Inventors Association of Connecticut. More about him and his publications can be found at http://www.docjava.com

------------Special Reward; the arduino Uno R3. For those who don't have one, or just need a spare, I have created a bundle that includes an Uno; Pictured below:

Risks and challenges

With all projects, there are inherent risks involved and this project is no different. There are basically 3 challenges that we need to overcome.

The first has to do with the availability of the Processor. The board fabricator is off-shore, but has proven themselves as more than able to fabricate the board at a low-cost and high volume in reasonable speed (it takes 6 weeks, using a slow, low-cost, shipper).

The second is the assembly. To keep costs down, we have allowed our assembler plenty of time to fabricate the boards. All components are through hole components, and this creates a great deal of overhead in assembly. This creates a 3 month lead time.

The third is testing and a possibility that something might go wrong after assembly (we hope it wont!). This is why we have a promised delivery date of August. We will order the boards as soon as our project is funded. We plan to under-promise and over deliver!

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    OK, so you missed the $15 raw board offer. It is not so bad! Here is an encore release, 1 (one) Raw board, with parts. Professionally made, silk screened and solder masked. User must assemble. Remember which end of the soldering iron is hot. Just like the days of the heathkit. Just imagine how jealous your maker friends will be when you tell them: "I built it myself!". How exciting!!

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    OK, so you missed the $15 raw board offer, then you missed the $17 raw board offer. Why are you waiting? Here is the encore offer! $18. AND two CdS cells, AND 1 Raw board, AND all the parts..now how much would you pay? But wait, there is more!! TWO (yes, not one, but TWO) GOLD PLATED STEREO 1/8 inch to 1/4 inch adapters, for those guitar and amp applications. You will have a shield, play it often, play it LOUD! This is an UBER LIMITED OFFER, so ACT NOW while supplies last, this is OFFER NOT AVAILABLE in STORES! Professionally made, silk screened and solder masked. User must assemble. Remember which end of the soldering iron is hot. Just like the days of the Heathkit. Just imagine how jealous your maker friends will be when you tell them: "I built it myself!". How exciting!!

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    OK, so you missed the $15 raw board offer, then you missed the $17 raw board offer. Then you missed the $18...now, with less than 24 hours to go, you better act now!! AND two CdS cells, AND 1 Raw board, AND all the parts..now how much would you pay? But wait, there is more!! TWO (yes, not one, but TWO) GOLD PLATED STEREO 1/8 inch to 1/4 inch adapters, for those guitar and amp applications. You will have a shield, play it often, play it LOUD! This is an UBER LIMITED OFFER, so ACT NOW while supplies last, this is OFFER NOT AVAILABLE in STORES! Professionally made, silk screened and solder masked. User must assemble. Remember which end of the soldering iron is hot. Just like the days of the Heathkit. Just imagine how jealous your maker friends will be when you tell them: "I built it myself!". How exciting!!

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    Assembled board. Fully functional. VERY Limited supply, early reward. OK, you missed the $20 pledge! Don't miss out on this great price!

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    Stereo Kit Set. Two KITS one for the left and one for the right channel, two boards, all parts. User must assemble. These need to be used with two arduinos for left and right channels because they both use the same adc port. Double the delay, double the effects, double the processor and double the fun! Two professionally made, silk screened and solder masked printed circuit boards. Have an organic assembly experience! Drip hot solder on your leg. Remember which end of the soldering iron is hot. Just like the Heathkits of yesteryear. Imagine how jealous your maker friends will be when you say: "I built it myself". How exciting! This is an UBER limited supply, so act now, this wont last long!

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    OK, so you missed the stereo kit set for $28. It is not so bad! Here is a new Stereo Kit Set reward. Two KITS one for the left and one for the right channel, two boards, all parts. User must assemble. These need to be used with two arduinos for left and right channels because they both use the same adc port. Double the delay, double the effects, double the processor and double the fun! Two professionally made, silk screened and solder masked printed circuit boards. Have an organic assembly experience! Drip hot solder on your leg. Remember which end of the soldering iron is hot. Just like the Heathkits of yesteryear. Imagine how jealous your maker friends will be when you say: "I built it myself". How exciting! This is an UBER limited supply, so act now, this wont last long!

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    Oh no, you are late to the project. Bummer. Well, It is not so bad! Here is a new Stereo Kit Set reward. Wallow in the AWESOMENESS that is all yours! Two (count 'em, 1,2) KITS one for the left and one for the right channel, two boards, all parts. Now how much would you pay? But wait, there is more! You also get TWO (yes, that is right, not one, but TWO) gold-plated stereo 1/8 inch to 1/4 inch adapters for those KRAZY space jams with AMPS and guitar-stuff. Now how much would you pay? But wait! There is yet even more! This KRAZY EDDIE give away includes Two Light Dependent Resistors (LDRs). Oh boy. It like <insert holiday season here>. These LDRs are made with only the highest quality polymers and rare earth Cadmium Sulfides. Check the update for all the cool stuff you can do with LDRs. ASSEMBLY REQUIRED THIS IS A KIT. These need to be used with two arduinos for left and right channels because they both use the same adc port. Double the delay, double the effects, double the processor and double the fun! Two professionally made, silk screened and solder masked printed circuit boards. Have an organic assembly experience! Drip hot solder on your leg. Remember which end of the soldering iron is hot. Just like the Heathkits of yesteryear. Imagine how jealous your maker friends will be when you say: "I built it myself". How exciting! This is an UBER limited supply, so act now, this wont last long!

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    Assembled board. Fully functional. These units will sell for $40 after we go into production.

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    A new reward! One, fully assembled and fully functional audio dsp shield AND one brand new R3 Arduino UNO! This is in UBER limited quantity. I had parents call me, on the PHONE asking for a kit that included everything. Well this is it! Just imagine how much fun your child will have. MAKE MATH FUN! MAKE SIGNAL PROCESSING FUN! What we have here is an opportunity to create a new way to teach and motivate MATH. How exciting! Lets all make a difference in a childs' life. Give the GIFT of Signal PROCESSING!

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    You missed the low cost of the $50 package. And the americans are broke, so they raised the cost of International shipping (its not my fault!)...So, here it is again, an encore reward; One, fully assembled and fully functional audio dsp shield AND one brand new R3 Arduino UNO! This is in UBER limited quantity. Don't give those little girls EZ Bake ovens, dollies and teach them to be Suzy HomeMaker. Give them excellent engineering tools. Improve diversity in the profession. MAKE MATH FUN! MAKE SIGNAL PROCESSING FUN!
    A new way to teach and motivate MATH.
    How exciting!
    Make a difference in a childs' life.
    Give the GIFT of Signal PROCESSING!

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    One, fully assembled and fully functional audio dsp shield AND one brand new R3 Arduino UNO! This is in UBER limited quantity.
    You get TWO gold-plated stereo 1/8 inch to 1/4 inch adapters and Two Light Dependent Resistors (LDRs). Two LDRs in Every Pot! Shine a Light on Me!

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    Stereo set. Two boards, fully assembled and functional. These need to be used with two arduinos for left and right channels because they both use the same adc port. Double the delay, double the effects, double the processor and double the fun! This is a very limited supply.

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    Oh No, you missed the early reward stereo set! Well, no worries, because here is an encore reward. You better act now, because this is an UBER limited quantity.
    Stereo set. Two boards, fully assembled and functional. These need to be used with two arduinos for left and right channels because they both use the same adc port. Double the delay, double the effects, double the processor and double the fun! This is a very limited supply.

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    Stereo set BUNDLE with with an R3 UNO! Two, fully assembled and fully functional audio dsp shields AND one brand new R3 Arduino UNO! Two DSP Shields need to be used with two arduinos for left and right channels because they both use the same adc port. Double the delay, double the effects, double the processor and double the fun! This is a very limited supply. Comes with ONE Uno, in case you need an extra to make your project fly!

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    Am I seeing Double? OK, Here we go. Two R3 UNOs. Yup that is right! A host for the left channel and a host for the RIGHT. Also TWO DSP Shields for the TWO Unos. AND TWO (yup, you can count 'em: 1, 2) Light Dependent Resistors containing REAL cadmium (just like the cadmium used by impressionists in yellow paint). But wait! There is more! GOLD. Yup. You heard me. GOLD, that barbaric relic, coated all over TWO 1/8 inch to 1/4 inch adapters. What a deal. Public school education teaches children to fear and hate math
    as being impossible and dull.

    Here we have an electronic math tool that makes math fun!

    Every math idea that you implement now results in something that you can hear and do. Through active learning and experimentation students obtain an original educational experience. This is NOT a cook-book style of learning, where every answer is known in advanced. Instead it is a tool for exploration, into the unknown.

    Students discover the awe and wonder of real-time programmable sound processing and sound synthesis. Kids become real programmers and become excited by mathematics.

    A Mind-blowing system that makes math AWESOME!

    Double the ARDUINONESS with TWO of everything.

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Funding period

- (60 days)