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 (fancy opamp-based circuits can be better).
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
We are also looking for a couple of helpers, please contact email@example.com if interested.
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.
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."
- When: Sunday, March 29th, 1-5pm
- Cost: Free/Donation $
- Where: Control-H, 7600 N Interstate, Portland, OR
- Bring: A laptop with KiCad installed + power cable (and maybe a mouse)
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.
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!
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.