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/

Website work

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!

FuzzFace Workshop Results!

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

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
 

Random November 2nd Meeting Photos!

I just thought I'd post some random photos and projects from the last DorkbotPDX meeting.  Lots of fun stuff.

Tom Hudson brought his shaking haunted house. He worked on it with his coworkers at OMSI. It uses a saber saw as the shaking mechanism. Pretty sweet. He's posted an Instructable about it if you're more interested.

DorkbotPDX 11/2/2015

 

DorkbotPDX 11/2/2015

Mykle Hansen brought his Teensy Synth project. It made some sweet, crunchy sounds. I think it is based off of this project.

DorkbotPDX 11/2/2015

Mathew Lippincott brought his Portal Gun from Rick and Morty. It used an 800 lumen flashlight to project the portal! Very cool!

DorkbotPDX 11/2/2015

Scott Dixon brought a new robotics platform that he's playing around with. It's not hooked up to his Bluetooth Barbie steering wheel yet, but maybe soon. I didn't catch what the platform actually is, maybe he'll chime in on the comments.

DorkbotPDX 11/2/2015

Here were some folks playing with using balloons to diffuse LEDS. Reminds me of this project.

DorkbotPDX 11/2/2015

Finally, some folks just hacking together. I didn't find out what they were doing, maybe they'll chime in on the comments below. DorkbotPDX 11/2/2015

 

Fun projects, great to see so many projects on display!