phooky

May 052014
 

A quick word of warning for those coming to Laser Night tonight: our laser is having some power issues and is not operating at 100%. We’re working to fix the issue as quickly as we can, but we probably can’t cut anything thicker than a couple of millimeters at present. We’ll sing out once everything’s up and running again!

 Posted by at 3:30 pm
Apr 212014
 

Interactive Show

Get that Club Mate cold and those soldering irons hot because it’s time for another Interactive Show! We’re putting out the call to hackers around the globe to come show your stuff at our annual party.

This year there’s no theme– it’s a free-for-all! Have something blinking and beautiful? Something that bleeps or bloops? Anything interactive goes!

This year’s show will be June 7th. If you’re interested in being part of a show, drop us a line at ishow@nycresistor.com! Try to get in touch by May 7th so we can make sure there’s space for your project. Hope to hear from you soon!

Props to Olivia Barr for our awesome gif flyer this year!

 Posted by at 5:41 pm

Fragments

 Uncategorized  1 Response »
Feb 042014
 

Once there was a box. Inside the box was a board, and inside the board was a chip. Inside the chip was a carrier, and on that carrier was a die. And when the die came off the carrier it broke, and the pieces looked like this:

2014-02-03-214452

More pretty pictures below.

Continue reading »

 Posted by at 10:38 am
Nov 252013
 


In a show of solidarity with our oppressed Meleagris gallopavo brethren, there will be no craft night this Thursday, November 28th. We recommend gathering together with friends and loved ones and sharing a hearty seasonal meal of kale and pine nuts instead. See you all next week!

May 242013
 

Some technologies are so direct and intuitive that they feel classic even when they’re new. Some technologies are so ahead of their time that they only find their true purpose years after they’ve been put out to pasture.
Minitel 1B US
In the early 80′s, France Telecom rolled out the Minitel, a videotex system offering various online services to users across France. Subscribers were given small, semi-portable CRT-based terminals. The service was a success, and at its peak boasted 25 million users. But eventually, well, you know. The internet. In June 2012, France Telecom finally pulled the plug on the Minitel. Screens across the country went dark. Millions of little, boxy terminals, suddenly cast adrift. Widespread technology, lost and alone, in search of purpose. Purpose now, suddenly, found.
welcome_to_tumblr_com
The Minitel/Tumblr Time Tunnel is a Minitel 1B US (yes, there was a QWERTY version) backed by a Raspberry Pi. Enter a few tags at the prompt, and the mighty firehose of Tumblr will be unleashed upon your tiny, 3-bit*, 80×72 pixel black and white CRT display. By cranking the serial port up to 4800 blazin’ bits per second and reducing the number of color swaps, you can view the genius of the internet at such blinding speeds that you’ll think that you’ve suddenly been transported to a Jetsonian future of videophones and cars that collapse into briefcases. It’s just that advanced. See for yourself:

(The asterisk after “3-bit” is due to the fact that each 2×3 block of “pixels” is actually a single character with foreground and background color attributes, so each 2×3 block only has one bit of color data, selected from a palette of 8 colors.)

As is de rigueur, all the code is available on github.

The Minitel/Tumblr Time Tunnels will be on display at this year’s NYCR Interactive Party. Be sure to come by and see the internet the way it positively demands to be seen!

 Posted by at 9:08 pm
May 112013
 

Reading punched tape

Rapid prototyping tools are great for quick hacks, but their real power lies in their ability to allow you to quickly iterate and refine a design. Earlier this week I hacked together a primitive nine-channel punched paper tape reader, but it had a number of limitations: the LEDs that I was using to read the bits were noisy and slow, the materials used didn’t mask the light well enough, the tape wasn’t mechanically aligned well, the electronics were a mess and the entire mechanism was difficult to use. This Friday, I decided to do what my third-grade teacher would tell me to do every time I half-assed something: go back and do it right.

Tape reader parts

This time I used proper phototransistors and IR LEDs I scrounged up around the space (thanks, Miria and Raphael!). Because they’re 5mm in diameter (and the spacing between channels is only 2.54mm), I had to come up with a new sensor packing. This one reads bits from four separate columns over a space of five columns, requiring an internal buffer of five columns to reconstruct a single column of data. Even so, the spacing was tight, and I had to sand down the flanges of the phototransistors and LEDs to make everything fit. I milled simple PCBs for both sides to keep things nice and neat, and used a small surface-mount potentiometer to limit the current to the LEDs in case the paper wasn’t thick enough to block enough light. The light mask is made of black acetal this time, and the spacers include runners to help keep the tape straight. There’s still no automatic feed mechanism, but we now have a reader that’s fast and reliable enough to read tapes in earnest.

The updated code, mechanical drawings, and PCB designs are all up on Github. There are still a few tweaks we’d want if we were going to scan more tapes, but this version works very well. Now we just have to figure out what to do with all these PDP-8 binaries. Any ideas?

IMG_4912

(Note to time-travelling computer conservators: in the past/future, please do not store your paper tapes in damp basements. These programs are stinky. The Fortran compiler, in particular, is exceptionally foul. Yours truly, phooky.)

 Posted by at 6:17 pm
May 092013
 

Trammell came across a cache of punched paper tape recently. My immediate impulse was to create the most primitive tape reader possible. Thusly:

The rig is composed of a Teensy++ 2.0, eighteen red LEDs, eighteen resistors, and a few bits of laser-cut plastic. LEDs are used to both illuminate the paper and sense the holes. The sensor design is based on the classic Arduino LED sensing code. It’s not very reliable, but it’s a fun afternoon proof-of-concept.

If you’re interested, the code and design files are up on github.

 Posted by at 8:54 pm
Mar 312013
 

So, once in a while, I wake up feverish in the middle of the night, screaming “CLAMPS! I NEED MORE CLAMPS!” Oh, you too, huh?

It's clamps.

It’s your lucky day! Or rather, this coming Sunday, April 7th is your lucky day, when NYCR and our good friends at the Industry City Distillery will be having our first-ever garage sale. We’ll be selling all kinds of hardware oddities, including:

  • Clamps!
  • Hand tools!
  • Power tools!
  • Strange, unidentifiable tools meant for neither hand nor eye!
  • Microscopes! Boroscopes!
  • Audio equipment! Video equipment! Audiovisual equipment!
  • Files! Floppy diskettes! Raw steel! Cooked steel!
  • A vertical mill! (U-buy, U-move!)
  • Clamps!
  • Files!
  • Electronic bits! Non-electronic bits!
  • More VHS recorders than you’re prepared to buy!
  • aaannnddd moooooorrrreeee!!!

We’ll be having the sale in beautiful Industry City, Brooklyn, in association with the Industry City Distillery, manufacturers of incredible spirits. Come by to buy! Come by to browse! Come by to meet amazing people!

Files, on floppy and off!

The sale starts at 11:30 AM, Sunday, April 7th and continues until sunset, at which point we’ll just start calling it a party. The address is 33 35th Street, Brooklyn, NY, just two blocks downhill from the 36th Street Station on the D, N, and R trains. It’s just one stop on the N train from NYCR.

See y’all Sunday!

(We’re not kidding about the mill.)
It's a mill.

 Posted by at 10:38 pm
Mar 202013
 

LCD backlight teardown

These are seven layers of a backlight from an old laptop LCD. The amount of optical engineering required to produce a nice, even glow from an edge-lit panel is impressive.

Backlight filters

(Be careful if you’re taking one apart yourself– until recently many LCDs were backlit by CCFLs, which contain a small amount of mercury and need to be disposed of properly.)

 Posted by at 5:31 pm