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Pat showed us his Pi hooked up to a webcam and running motion-detection software:

Michail brought a Raspberry Pi-controlled Bitcoin mining rig. Those seven little boards are Application-Specific Integrated Circuits (ASICs)–special-purpose hardware designed expressly for Bitcoin mining. The display shows that it’s generating over two billion hashes per second! A very interesting discussion about Bitcoin ensued.

Stephen has turned his Pi into the beginnings of an inertial navigation system. He had it transmitting six channels of acceleration and roll rate over Bluetooth to his laptop. Soon it’ll be the brains of a Segway-esque robot.

The Raspberry Pi turns two years old this month, so we celebrated its birthday with some raspberry pie (courtesy of Stephen).
Join us next month (3/19) for more Raspberry Pi!


The meeting kicked off with Eva’s RasPi-controlled Christmas tree–very cool!
photo 3
JR’s own Alan W shared his courageous story of getting ssh to work.
photo 4
Newcomer Dennis wanted to get an infrared motion detector working with his Raspberry Pi but didn’t know where to start, so some of the more experienced folks showed him how to edit and run a Python program. In short order he had a rudimentary “alarm” system going.
photo 5
Thanks to all who attended! Next meetup: Jan 15.


Steve found some surgical tubing in the rummage pile in the basement, so tonight during Project Night, he cut up some 2x2s, made loops of the tubing, and with a lot of effort and bruised knuckles, ended up with this example of tensegrity:IMG_0993
Pretty amazing!

In other news, don’t forget the Raspberry Pi meetup at Jigsaw tomorrow (Wed.) night.

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Hello Kitties!

by Michael Park, Treasurer on December 5, 2013

in News

IMG_0977Ceramics artist and Jigsaw member Ling Chun has just put up an installation as part of the Storefronts Seattle program. It’s an interactive animatronic piece consisting of eight maneki-nekos that do “the wave” when people pass by.

Check it out at the Publix Hotel on 5th Ave, just a couple of blocks from Jigsaw.

Here are a few photos of Ling constructing the piece at Jigsaw. Other Jigsaw members provided technical and moral support during the process.

Technical details: Each cat had its innards replaced by a servo, two X-band motion sensors are used to detect the presence of people, and a Parallax Propeller microcontroller drives the system.


A very interesting meetup last night. We had three presentations. First, Rutger gave an overview of RasPi basics for the newbies.
Then Alan told us about BitTorrentSync and how he’s installed it on his Raspberry Pi to make his own personal “Dropbox”-like system.

Finally, Steven showed off something amazing: an old school Mac with a Raspberry Pi for brains. He’s using the Pi’s I2S to drive the Mac’s monochrome video, using PWM to generate sync signals, and DMA to get those two systems in sync. Pretty crazy, but very clever.

Next meeting is Dec. 18. Mark your calendars!

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This weekend, November 8-10, hackathons will be taking place all over the world in memory of Aaron Swartz. Jigsaw is hosting the Seattle hackathon. The event will bring together the varied communities that Aaron touched to figure out how the important problems of the world connect, and to share the load of working on those problems.

The November 8-10 hackathon series is being coordinated on this wiki page:


Within weeks of Aaron’s death in January, 20 hackerspaces, schools, and libraries organized Aaron Swartz Memorial Hackathon events all over the world. In our collective shock and grief, we came together to console ourselves, remember Aaron, and, in his memory, to work on important problems ranging all the way from open access advocacy to a database refactor.
Half a year later, we still feel an immense shock and loss, and after many conversations with people who attended one of the initial events, still think that we need to be there for each other and focus on the things that are important.

More details here:


Jigsaw’s own Ben Dobyns will be conducting a workshop on Kickstarter this Saturday starting at 10AM. Ben and Zombie Orpheus Entertainment have been remarkably successful at raising funds via Kickstarter, and he’ll be sharing the secrets of his success. More info and registration (required) at


I salvaged an otherwise disappointing Sunday in Vancouver by visiting VHS. VHS member John gave a tour of the space and showed off his tricopter. I was really impressed with the space and took a lot of pictures in the hope we can steal some of their ideas.

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