Solar Power Charger Workshop

 

DORKBOTPDX June 2015 Workshop: Solar Power Charger Workshop

Experiment with solar panels and the other bits needed to charge Lithium Ion batteries via USB.
 
Sunday, June 28th, 1-5pm at 
Free! (Donate a bit to Ctrl-H if you can)
 

Teensy Audio Library Gets S/PDIF Support

Thanks to the amazing effort of Frank Boesing, the Teensy Audio Library now has native S/PDIF output.

Using a $1 TOSLINK connector, or just a red LED, you can get optical S/PDIF digital audio output.

Optical output is useful for projects where Teensy connects to grounded equipment.  There are lots of ways to simply play sounds, but the Teensy Audio Library gives you Arduino-sketch controlled synthesis, mixing, effects & filters, analysis and much more.  Sketch controlled sound is most useful when you connect more hardware to Teensy & use other Arduino libraries for inputs.  But often that other hardware comes with ground connections that cause audio-corrupting ground loop problems with analog audio, like the DAC pin or the audio shield.  Optical S/PDIF give you perfect digital audio output for those projects!

Click "Read more" for much more detail about the S/PDIF development....

Ten Watt RGB LEDs

Spent a good portion of the weekend fiddling with insanely bright 10 watt RGB LEDs.

Trying to make very low-cost DMX protocol control, of course for a Burning Man project that's planning to use 150 of them!

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 (fancy opamp-based circuits can be better).

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.

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