A fantastic project by the tinker.it (Arduino) team, and I highly recommend it to anyone who is interested in getting into electronics, using Arduino or just wants to build a synth. All code, designs and schematics are open under Creative Commons Attribution-Noncommercial License. All files (designs, code et cetera) I used/made can be downloaded below.

A friend showed me his Auduino, and I needed to build one too! I decided to make a few modifications to the original. I added a switch that enables a light dependent resistor (LDR) to control the rate of the noise, which essentially means the more light that hits the resistor, the faster the tempo. When the switch is on, it disables the associated potentiometer and enables the LDR. It’s a fun addition and you get the chance to put your whole body (or just hand) into the synth.

I also did not want to commit to one mapping of the Auduino — I liked both the the smooth frequency and the stepped pentatonic mapping, so I added a switch to move between the two synthesiser parameters.

Section of edited code:

if (digitalRead(SWITCH)) {
// Smooth frequency mapping
//syncPhaseInc = mapPhaseInc(analogRead(SYNC_CONTROL)) / 4;

// Stepped pentatonic mapping: D, E, G, A, B
syncPhaseInc = mapPentatonic(analogRead(SYNC_CONTROL));
}

This is the schematic for the way I wired my Auduino. I used Fritzing software, which is also a great beginner tool for prototyping your circuit board. Fritzing is a neat open source project, I recommend checking them out.

Lastly, I needed to design an enclosure, which was also a first. Inspired by enclosure extraordinaire, Xander (see his work at machinecollective.org), I designed a simple yet functional enclosure in Illustrator and cut it using a laser cutter. After two failed enclosures, the third one fit! I initially wanted to have it enclosed in black satin acrylic, but I ended up with a transparent enclosure so I could see the components. In retrospect, I should have stuck with the black as the transparency detracts from the minimilist aesthetic I sought. I have attached my designs here — feel free to use/modify (CC license).

How does it work?

Tinker.it explains: “Sound is generated by playing the same noise (‘grain’) repeatedly at very high speed. This merges into a tone that is an audible hybrid of the repetition rate and the original grain. It sounds quite similar to an oscillator with two resonating bandpass filters, although the different architecture means there are lots of additional interesting noises at parameter extremes. The grain consists of two triangular waves of adjustable frequency, and adjustable decay rate. This is based on FOF synthesis model, but using triangle waves instead of sine and using a rectangular window. The repetition rate is set by another control.”

Build one too! After spending the last few months at the CabFabLab, I have been become enamored by physical computing, and I have been reading makezine fairly religiously now. If you are just getting into this world, like me, it is a fun blog to read.

Resources:
- The Google group that details the project here.
- My minor edit to the code can be found here.
- My illustrator designs can be found here.
- My Fritzing file (schematic details) can be found here.

We had the opportunity to meet interesting people, network with industry leaders, hear inspirational talks (and not so inspirational ones), and rekindle some of our energy/enthusiasm about the future of the web and 2010 in general. It was surely a nice antidote for entrepreneurial burnout. Off course, some truly great food and wine and simply enjoying the beautiful City of Light doesn’t hurt either.

A lot has been written about Le Web 09 already and we don’t want to simply recycle content, but rather offer a few highlights of our personal experience:

Twitter and Square
First off, we heard the term Twitter a bit too much, but that’s not surprising. Not only was it spoken about constantly (especially rumors about a Google purchase), but it seemed like everyone were on Twitter compulsively every spare second they had. The conference started out with Jack Dorsey, co-founder of Twitter, presenting his newest venture: Square. Square is a small hardware attachment for the iPhone that allows users to accept credit card payments directly in person. It looks very promising and using the headphone jack plug is a creative solution. The application’s interface seems incredibly intuitive and quite beautiful, and will likely be a hit. We also had an opportunity to watch Jack demo Square close up at a reception thrown by the Mayor at the Paris City Hall: