Jan 242014

If you’ve ever been running at night in New York City, you know that it can be dangerous, especially if other people can’t see you. This jacket was my attempt to not get flattened by a bicycle at night. Of course, I could have just bought some plain running lights, but what fun is that? Not only does this jacket have seven awesome flashy modes, but each mode responds to my heart rate!

 led_image_2 01

Since my Garmin heart rate monitor uses the ANT protocol, I could easily intercept the heart rate information for my jacket. I used a Teensy and an ANT transceiver to control two LED strips based on the current mode selection and the current heart rate. The jacket is powered by rechargeable battery packs.

My first run with the jacket was the 2013 New Year’s Eve midnight run in Central Park. Since then, I’ve worn it to a few races and even to a tech talk. The full build out details can be found here.


Jan 072014


This weekend at NYC Resistor we are teaching a class on the BlinkyTape. If you’ve been wanting to make a project that incorporates LEDs and custom lighting, then this might just be the class for you!  BlinkyTape is one of the easiest ways to make interactive lighting installations, so this is a great class for makers of every level.

Bring your laptop and we’ll teach you how to create your own animations and patterns using your BlinkyTape. A BlinkyTape, usb cable, and power supply will be included in the class fee.  Which is amazing!

There are a few seats left so sign up now for this exclusive executive tour of this luxury LED lighting solution!

OMG first post for 2014!



Dec 272013


NYC Resistor has been known to occasionally homebrew a beer or two. We have members interested in the topic, and friends in the wider brewing community of NYC. However, since I’ve returned from California, I’ve found myself more and more interested in beer brewing at Resistor. Luckily Travis, a fellow member is also deeply into the homebrew hobby. Together we’ve been spinning up a few different projects over here. There will be some great follow up posts on those other projects I am sure. Read on for more about brewing at NYC Resistor!

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Dec 092013

Bring your cash and your curiosity to our FIRST EVER HOLIDAY CRAFT FAIR December 15, from 12-6pm. We’ll offer a free soldering workshop that day as well as host a number of makers in our area who’ll be selling their items. Also for our first 100 visitors, a free NYC Resistor holiday ornament!

Anyone from the community also interested in selling at the event is welcome to email us for an open spot while they last at resistorholiday@gmail.com.

 Posted by at 12:48 pm
Dec 082013

Adafruit FLORA and Neopixel ring

Next weekend at NYC Resistor we are teaching a class on the Adafruit FLORA and Neopixel. These round Arduino compatible controller boards are a great base for wearable projects like watches, jackets and neck ties, as well as holiday decorations. Bring your laptop and we’ll teach you to make the LED ring blink with patterns of your own design. No prior programming required. The class fee includes a FLORA board, batteries, cabling, 4 RGB LED pixels and a 16 RGB LED ring.

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!

Nov 182013

AVR RFID with extra capacitor

Last year we wrote about building HID Proxcard RFID tags with attiny85 microcontrollers (based on Micah’s avrfid.s code). The C version only supported classic 26-bit cards, but I recently needed to support the “secure” HID Corporate 1000 35-bit format.

Based on Daniel Smith’s writeup on the format and some digging around, I figured out that the MFG_CODE for this format is 10-bits long with the value 0x005. He also pointed out that the 26-bit firmware had the wrong code — it is not the 20-bit code 0x01002, but is instead the 19-bit code 0x0801 and the bottom bit is part of the parity computation for the card id. If you’re using a HID branded Proxcard reader, the value that it outputs is the entire data portion, including all of the parity bits, but does not include the MFC_CODE part. If anyone knows of a table of these codes, please let me know!

I’ve updated my firmware with these changes and it works great. Emulating a 35-bit card takes 846 bytes of flash (nine more than the 26-bit cards since the state machine stores one bit per byte), so it might be possible to port this to the attiny10. I’ve also found that the tags work much better with a small capacitor across the two clock pins, as shown in the above photo.

Nov 032013

Photo by flickr.com/cbrobotics

I’d like to share a neat Eagle hack for all our the people who have taken our Eagle CAD classes (myself included) and our Eagle-using friends.

BOM-EX is nifty little ULP (User Language Program) that extends the functionality of the built-in BOM ULP. BOM-EX not only helps you assemble a coherent BOM (Bill of Materials) right from your Eagle schematic, but it also makes it easy to assemble a database of parts, and associate those parts with parts numbers for DigiKey, Mouser, Newark, etc.

I made a nice little script that lets me build my BOM database without ever leaving the DigiKey website…

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 Posted by at 2:26 pm