DorkbotPDX May 2015 Workshop: OPEN LAB!


OPEN LAB 

at Control-H, 7608 N. Interstate, Portland, OR 97217
Sunday, May 31, 2015 1-5pm
 
While having a single teacher and many students helps get ideas and skills out to the community, sometimes it is more fun to have some chaos.  So instead of one to many, we'll have many to many.  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!
 

Control Voltage (CV) to Analog Input Pin

Often I've been asked how to get synth control voltage (CV) into an analog input pin.  Teensy 3.1 has 13 bits effective analog resolution, good enough for many CV applications, but the stable internal reference is only 1.2V with analogReference(INTERNAL).

This simple circuit converts the -5V to +5V CV signal range to the 0 to 1.2V ADC input range.

Edit: here's a discussion about this circuit's details and limitations.

DorkbotPDX April 2015 Workshop: Federated Wiki

Learn how to:

  • Setup and deploy your own federated wiki server.
  • Share your content.
  • Pull content from other people running federated wiki servers.
  • Go here for more info!

Sunday, April 26th, 1-5pm

with Ward Cunningham

Ctrl-H, 7608 N. Interstate, Portland, OR 97217
FREE!/Donation
Bring a laptop with NodeJS pre-installed
RSVP to bzzt@knowhere.net

We are also looking for a couple of helpers, please contact bzzt@knowhere.net if interested.

 

For Sale

I have 4 12v strands of 50 WS2801s for sale (200 Adressible RGB LEDs total). If someone is willing to swap a $100 bill for them, they're yours.

DorkbotPDX 0x0D

  • When: Monday May 4th, 2015 - 8pm
  • Where: Bunk Bar - 1028 SE Water Ave (map)
  • Who: All ages -- open to the public
  • Cost: Free!

KiCad Workshop

 

Have you ever wanted to design your own PCB from scratch?  Are you curious about the design process and the tools and techniques used by pros and hackers alike?  Maybe you have some experience with Eagle PCB and want to try out a free and open source design suite...

Now's the chance to learn KiCad!

"KiCad is an EDA software suite for the creation of professional schematics and printed circuit boards up to 32 copper layers with additional technical layers. KiCad runs on Windows, Linux and Apple OS X and is released under the open-source GNU GPL v2 free of charge."

The workshop will be hosted by hardware ninja Jared Boone of Sharebrained Technology and HackRF fame.

Details:

Power Playground Project


Power Playground

Here's a few pictures of my latest project: "Power Playground."  It's a PMOS/NMOS H-Bridge with FETs that can handle 3 amps or so, plus a SPI current sensor, some switches & a rotary encoder (not stuffed yet), and a 7-segment display, all controlled by a Teensy-3.1 running FreeRTOS.

DorkbotPDX Code of Conduct

DorkbotPDX Code of Conduct


DorkbotPDX is committed to providing a socially safe and friendly environment for people doing strange things with electricity.  We welcome all, regardless of techical experience, gender, sexual orientation/identity, age, ability, ethnicity, religion, or physical/biological cybernetics.

DorkbotPDX expects attendees to be:

  • respectful - Don't seek to irritate, annoy, or otherwise disrupt others.
  • cautiously helpful - Share what you know, but don't assume you know more than someone else.
  • engaged - If you're curious and wondering, just ask.  If you're asked, try to answer or brainstorm.

Because we wish to foster an open, diverse, and engaged community, DorkbotPDX does not tolerate discrimination or harassment.  We are particularly sensitive to discrimination against and harassment of socially marginalized groups.

Any person in violation of these guidelines may be warned or asked to leave.  If you are aware of any behavior in violation of these guidelines, please notify a DorkbotPDX organizer.

Art and tech events this week!

We are extremely lucky this week to have THREE art/tech events happening here in Portland featuring artwork from some of our favorite creative coders. Have fun and support your art/tech community by coming out for these events! The first two are part of First Thursday and you can easily walk between them.

Dungeon Hacker at DIODE Gallery Thursday Feb 5 6PM-9PM 514 NW Couch Featuring Dan Cohen, Ryan Johnson, Andy Lunday, and Gabe Shaughnessy http://www.augmentedart.com/hack-the-dungeon/

Electric Fields by Jeremy Rotsztain at UPFOR Gallery Thursday Feb 5 6PM-8PM - 929 NW Flanders http://www.upforgallery.com/future/


ByteMe 4.0 at AFRU Gallery Friday Feb 6 6PM-11PM - 534 SE Oak St. Featuring Church of Robotron, Libby White, John Brown, Ben Purdy, and more! http://www.afrugallery.com/event/byte-me-4-0/

A few of us worked on the Church of Robotron install for ByteMe, so here's a far too large flier for it!

VS1053 Troubleshooting

Last night, I looked into why Adafruit's VS1053 only works with Teensy 3.1 at 24 MHz, but not 48, 72 or 96 MHz.

Turns out, the library depends SD.begin() to reconfiguring SPI.  It also runs data transfer code from both main program & interrupt context (causing havoc if the interrupt occurs at the wrong moment).  Pretty amazing it's worked on AVR for so long, but apparently it does crash sometimes.  Faster processors increase the opportunity for the problem to strike.

Hopefully my edits from last night will fix these problems for good.

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