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Christopher Arnold
Attended University of California, Irvine
Lives in Pleasanton, CA
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Christopher Arnold

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After lots of trial and error with buck converters and 3.3 / 5 volt data issues I have a functional circuit for the playa bikes! Thanks for all the help from folks on the fastLED list!! Hope to meet some of you at BM!
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Zeke Koch's profile photoChristopher Arnold's profile photoAshley M. Kirchner (Norym)'s profile photoMike Thornbury's profile photo
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still processing... must be something wrong
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anyone have any good recommendations for gluing led strips like the neopixel weatherproof strands to metal? Ive tried jb weld, e6000, and high temperature hot glue all with poor results. I'm thinking of trying gorilla or superglue next.
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From https://learn.adafruit.com/adafruit-neopixel-uberguide

Very few glues will adhere to the weatherproof silicone sleeve. Using zip ties for a “mechanical” bond is usually faster and easier. The only two reliable glues we’ve found are Permatex 66B Clear RTV Silicone (not all silicone glues will work!) and Loctite Plastics Bonding System, a 2-part cyanoacrylate glue.
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Christopher Arnold

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Gluing LEDs to the playa bike. About 10 joints to solder.
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Christopher Arnold

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My led cubes project is taking shape. 5 more cubes to build!
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Ashley M. Kirchner (Norym)'s profile photoChristopher Arnold's profile photoDave Morgan's profile photo
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+Christopher Arnold I'm running into the same assembly challenges with my recent LED circles project. I actually put it aside for awhile and will hopefully come back to it with a fresh perspective before too long!
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Christopher Arnold originally shared:
 
Some of you who follow my music production posts will probably know that I've been really excited about this new Blend.io service for music production and online collaboration.  

So here's my first Ableton live project, shared out with parts for resampling and remixing.  I think this service will help foster more collaborative electronic music production in the same way GitHub has facilitated online code branching and forking of software projects.
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Have him in circles
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I have been struggling with some strange behavior using a teensy 3.1 board and ws2812b 60 LED/meter strips (approx 300 pixels) for a bike project.   After much back and forth I've discovered the following behavior.  If I'm powering a simple example FastLED rainbow sketch off of USB power from my laptop I can run the sketch for a strand of 30 LEDs fine.  When I attempt to use a 5v battery to power the Teensy 3.1 and the LEDs I get no animation or color changes.  If I slowly scale the number of LEDs addressed in the sketch to 20 or fewer everything appears to work correctly using USB power or an external battery or power supply.

Finally after many hours of wondering what sort of hardware issues I may be running up against and swapping out several LED strands and teensy 3.1 boards I tried a different sketch that uses the Adafruit_NeoPixel library and went through the same battery of tests.  So far I am unable to reproduce this problem with that library so I think it may be a FastLED issue.  Has anyone seen behavior like this?  I've been working off of the FastLED2.1 branch.
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I will also try to finally get this nailed down to work around the voltage issue - this and some intermittent problems people are having with the WS2801 on some platforms, are the only things really keeping me from calling 2.1 done.
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Christopher Arnold

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Led bike V1 is powered up. I've encountered some voltage issues so troubleshooting continues....
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Thanks +Robert Atkins.  I ordered a bunch of those just in case.  I'll try one out next week.  I'm still futzing around trying to understand the issue. Doing the 3.3v => 5v logic conversion using the HTC didn't fix the issue.  I think it must have something to do with amperage on longer strands.  I don't understand why but adding a delay(2000) in the setup() at the beginning of one of my simple hue sketches fixed that sketch up to 255 pixels.  Adding delay() calls in various places to slow things down also has some positive effects on a couple of test sketches.
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Christopher Arnold

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Enclosure for my custom LED Bike controller. Teensy 3.1, Power on/off, momentary press for pattern changes, mic input for audio based patterns, potentiometer for hue/brightness control. The bike will have a strand of 300 ws2812b leds running various fastLED based patterns I've culled from the group.
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You are buying your Lipos in the wrong place:

$16.30 for 5000mah and just add a y-cable and a buck converter for a couple of bucks (or make your own loom). Adafruit have a design using the Tracopower DC::DC converter - I have a couple of them, but for $15, I can buy 7 cheapo transistor-based buck converters from China - or again, make your own with a 25c transistor from TI.

 2S: http://www.hobbyking.com/hobbyking/store/__16783__ZIPPY_Flightmax_5000mAh_2S1P_20C_USA_Warehouse_.html
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Has anyone else had issues with certain led chipsets when using a teensy 3.1 audio shield? Noticing my fft object is all zeros after instantiating a P9813 strand but if I comment out the addLeds call I see data. I was going to try a 2811 strand tonight to see if it's specific to that type of strand. 
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Does the teensy 3.1 audio shield use SPI?
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Christopher Arnold

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4:20 and Jade! I'll be at camp with lots of FastLED and teensy projects on display.
 
BURNING MAN 2014 ROLL CALL!!!!

Burning Man camp addresses: GO

9:15 and F: Stag Camp - ask for the Grumpy Stag annex in our group shade if you want to hang out, ask for Starbuck
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Christopher Arnold

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Out today on Bandcamp, for free or as much as you yourself feel it's worth.

Original Written by John Girgus, Colin Cameron Allrich, Cora Ripatti. Remixed by Christopher Arnold (bitwise).

Guitars, synths - John Girgus 
Drums, programming, guitar FXs - Colin C. 
Lyrics, vocals - Cora Ripatti

Recorded & mixed at The Cell Studio, Los Angeles 
Mastered by Colin C thecellstudio.com

Published by Negative Feedback (ASCAP) & Tremelo Arm Users Club (BMI) 
© 2013 All Rights Reserved, Confusion Inc.
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Christopher Arnold

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and another new one from my studio
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Have him in circles
178 people
Hector Reyes's profile photo
Chris Nolan's profile photo
Surkhab Niazi's profile photo
John Wulf's profile photo
Damon Petta's profile photo
Jordan Koch's profile photo
Jamie McGuire's profile photo
Rachel Hernandez's profile photo
Frank Abba's profile photo
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Currently
Pleasanton, CA
Previously
Los Angeles, CA
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  • University of California, Irvine
    Biology, 1994 - 1997
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