CHANTELLE KO
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Tape Solves Everything... Almost

16/1/2019

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I found out that I had two problems. One was that approximately half of my long breadboard is not working properly, so I had to squish my sensors onto a smaller breadboard that I am borrowing. My other problem was that if the headers on my arduino are perfectly straight, then they are actually not touching the connections on the board. I don't want to solder them down because that would create problems when I want to eventually attach the shield later on. So I used taped to pull them together and so the headers are leaning into the connections on the board. (I can hear the engineers grumbling at my outside of the box solution...)

Anyways... 
I've been slowly collecting all the parts I expect to need in order to start my TRAVIS II research. Before I get going on that I thought I should re-create my TRAVIS I setup to test out the softpots. Recap on why:
  • When plugging into the Lilypad there is no jitter when the sensors are at rest
  • The MKR shield was all soldered before I could test it with the sensors
  • When plugging into the MKR1000 the softpots have a bit of jitter when they are rest. The values flicker between 0-10. This may possibly be because the lilypad is 5V and the MKR is 3.3V 
  • I cut out the jitter and re-scaled the values inside my Max programming. The values 0-10 are right at the edge of the fingerboard. I would never play up that high anyways, so having that little bit of the softpots ignored was not a loss. I did not want to de-solder everything if it works the way I need it to. 
I wondered if maybe trying out different resistors for the softpots would fix the problem. Now that I purchased a new MKR1000 for TRAVIS II, I thought I would test it out before starting the new project.
  • I started by re-making the existing connections on my breadboard.
  • I tried swapping around the sensors to see if that affected anything, because back when I was working with the lilypad it was very temperamental in that all the sensors had to be in a certain order so that there was no bleeding of data. On the MKR1000 it didn't change anything 
  • I tried changing the resistors in one of the softpots. I found that the minimum resistor it could use while still getting its full values was 2.2k Ohm. Any smaller and I was not getting 1023 when I squeezed the top. 
  • Any larger numbered resistor than 10k Ohm did not show any difference 
  • No matter what resistor I used, the softpot was ALWAYS jittery when it was at rest! :( 
    • ​​Therefore, I must accept that it is impossible to take out the jitter on the MKR1000 with these particular sensors, and continue to hide the jitter in my programming.
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    Welcome to the TRAVIS blog!

    ​If you would like to see a summary of my work, please click here.  

    This blog is where I post updates on TRAVIS I & II as I continue developing them.
    TRAVIS I is an augmented violin that uses two Softpot sensors on the fingerboard to control sound fx, and two FSR's to bang presets.
    ​
    My wired prototype, uses an Arduino Lilypad USB. It was made by myself, and under the supervision of Dr. Bob Pritchard. 

    The wireless version uses an Arduino MKR1000. There was a group of engineering students who collaborated with SUBCLASS. Their names are Jin Han, Esther Mutinda, Carol Fu, and Lily Shao. For their own capstone they are utilized the same MKR1000 for the RUBS (Responsive User Bodysuit).  They named their capstone, WiRED (Wireless RUBS Environment Development). I have been modifying their work for my own purposes, as well as collaborating by making pieces with RUBS. 
    Bob Pritchard continues the RUBS project with TASTE. 

    TRAVIS II is was made in collaboration with Lora Oehlberg and luthier, Aaron Pratte. 

    It has four touch sensors​ made from conductive 3D print PLA and a voltage running down the strings. It also has four round FSRs clamped to the body. 

    You can find a videos and performances here. 

    A summary of my wifi connection troubleshooting can be found here. 

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  • Home
  • Bio
  • GLOBE
    • GLOBE Videos
    • GLOBE Gallery
    • Sensational World of Sensors
    • GLOBE Blog
  • TRAVIS
    • TRAVIS Videos
    • TRAVIS Blog
  • SUBCLASS
  • Other Academia
    • Soundscapes
    • Augmented Props
    • Sofra Ensemble
    • Music Tech Works
  • Resources
  • Contact