Website work

Submitted by breedx on Mon, 2016-04-11 00:26

You might have noticed some changes to the website.

We know that things are broken (like account creation and some past content).  We are working hard to shore things up and make them functional again while also modernizing things.  Please be patient, as progress is proceeding slowly...

If you notice something frustratingly broken or missing or out of place, or if you happen to be a Drupal ninja who wants to help out, please email jason@noisybox.net

Change is good, but comes with a cost.  Nerd on!

Advanced Microcontroller Audio Workshop Summary

Submitted by skinny on Thu, 2016-06-09 20:33

As I said in my last blog post, I've been meaning to do little summaries of the workshops, so here's another one!

Paul volunteered to give his Advanced Microcontroller Audio workshop again and I jumped at the oppurtunity to finally take it. When I arrived I got my workshop packet which included well written documentation and a kit filled with a lot of great stuff. Paul and Thomas talked very briefly and introduced the workshop. It's structured to be done at your own pace with Paul and Thomas hovering around to help when needed.
DorkbotPDX April 2016 Workshop

The documentation is here if you want to look at it. The kit came with a Teensy 3.2, an audio shield, breadboard with switches and pots, hookup wire, sd card, and a TFT display!

The workshop starts off with verifying the initial hardware and software, playing sounds, playing sounds with effects, and finally builds all of the way up to playing audio and displaying a peak meter on the TFT. Most of the workshop is centered around using the Teensy library via the graphical Audio System Design Tool which is a lot like Pure Data.

Here's a quick video of the final exercise, sorry about the crappy audio, I knocked one of the wires I had plugged into the display around a bit and it distorted the playback.

DorkbotPDX April 2016 Workshop

 

I'm excited to use the audio library in future projects. I want to scare some kids this Halloween with a project, having an easy sound library to do it with will definitely help.

FuzzFace Workshop Results!

Submitted by skinny on Fri, 2016-04-22 17:44

I've been meaning to write short blog posts about the results of the workshops we put on. I got an email asking me about the last one and it reminded me to actually do it. So here it is!

IMG_1938

I roped my friend Jim Titus into giving a workshop about guitar pedals since he started building them in his free time. The workshop started out with a presentation which you can download here. Jim talks about the history of guitar distortion which is very entertaining. Then he played some samples of early guitar distortion, there was a country song named "Don't Worry" by Marty Robbins which had an awesome sounding distorted bass. I'm not a country fan, but that part of the song rules. Jim then talked about the distortion circuit and showed some enclosures off (which became important later!)

IMG_1940

Then it was build time! We all got our kits and got to work. We all help each other through the build and eventually tested them on Jim's o-scope so we could see the affect the pedal had on a sine wave.

IMG_1946

There was an issue when we actually tried to use the pedals without an enclosure: there was no shielding and there was too much noise. Lucky for us one of the folks, Bruce Mulligan, had built an enclosure ahead of time. Bruce and his daughter built up their kit and installed it in the enclosure. After figuring out a grounding issue we had the distortion we were looking for!

Click below to listen to the pedal:

IMG_1947

Be sure to check out our next workshop, Advanced Microcontroller Audio with Paul Stoffregen

DORKBOTPDX April 2016 Workshop: Advanced Microcontroller Audio

workshop flyer

In case you missed it last year (like me!) it's happening again!  This hands-on microcontroller audio workshop will show you how to use a Teensy 3.2 and codec chip to generate and playback CD quality sound, and process and analyze audio in real time.

$45 for kit
Space is limited to 15 people! 
RSVP Required, email to paul@pjrc.com.  Limited to 15 people.

Instructor: Paul Stoffregen

Sunday, April 24st, 1-5pm at
Ctrl-H 7608 N. Interstate, Portland, OR 97217
$45 (Donate to Ctrl-H if possible!) All ages! 
http://dorkbotpdx.org/micro_audio_2016/

External antenna modifications for the Raspberry Pi 3

Submitted by wardr on Thu, 2016-03-10 01:06

Preface:

This post will detail a couple of different ways that an external antenna can be added to the Raspberry Pi 3.

DO NOT TRY THIS AT HOME.  ALL OF THE FOLLOWING WILL HAPPEN:
1) YOU WILL VOID YOUR WARRANTY
2) YOU WILL VIOLATE FCC REGULATIONS
3) THE PI'S WI-FI CERTIFICATION WILL BE VOID
IN ADDITION, YOU COULD EASILY DAMAGE YOUR PI

Please view this as a purely experimental exercise and proceed at your own risk.

DORKBOTPDX Feburary 2016 Workshop: HANDS ON JTAG FOR FUN AND ROOT SHELLS

 


 

 
JTAG may be almost 30 years old with little change, but that doesn't mean most people really understand what it does and how. This workshop will start with a brief introduction to what JTAG really is, then quickly dive into some hands-on practice with finding, wiring, and finally exploiting a system via JTAG.
 
For this workshop, we'll target a Raspberry Pi with an ARM microprocessor. In order to interact with the system, we'll use a JTAG interface cable from FTDI. We won't do any hardware modifications, but we will hook up wires in weird and wonderful ways to make the Raspberry Pi do things it otherwise shouldn't.
 
Sunday, February 28th, 2016 1pm
at Control-H, 7608 N. Interstate, Portland, OR 97217
 
Instructor: Joe FitzPatrick
Free, (donate to Ctrl-H if you can!) 
 
Limited to 20 people (or groups of people)
 
No equipment needed, everything is provided.
 
Upcoming workshops!
Sunday, 27MAR2016 at Control-H, Build your own FuzzFace Guitar Pedal with Jim Titus
Sunday, 24APRIL2016 at Control-H, Advanced Microcontroller Audio with Paul Stoffregen
Sunday, 29MAY2016 at Control-H, GLOBAL SYNCHRONIZED AUTONOMY with Rich and Friends

 

DORKBOTPDX January 2016 Workshop: OPEN LAB

OPEN LAB 

Control-H, 7608 N. Interstate, Portland, OR 97217
 
Bring a project or collaborate on someone else's project.
We provide space and power.  You bring tools and projects.  Ask fellow dorks for help and offer help to others.
RSVP by replying to this page and telling folks what you'll be working on!
Upcoming workshops:
February 2016: Build your FuzzFace Guitar Pedal with Jim Titus