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Jay Carlson
Attends University of Nebraska-Lincoln
Lives in Lincoln, NE
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Jay Carlson

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The two forms are actually called "Row echelon form" and "Reduced row echelon form" -- the person in the video seems to confuse "row" and "reduced" when naming the forms.
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Jay Carlson

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I don't understand why you're adjusting the PWM frequency based on Slider2. Why aren't you just leaving it fixed at 40 kHz? Generally, for PWM, you just modify the duty cycle (accomplished with the SetSpeed() function)

Also, your discussion at the end is confusing. You've been using PWM the entire time -- when you call SetSpeed(), you're setting the duty cycle of a PWM module that's driving your H-Bridge. Your discussion implies that PWM is something completely different. And running motors using the linear region of a transistor (which dissipates the unused energy as heat as you mention) is never really used -- certainly not by any Gadgeteer modules. Everything is PWM.

As a bonus note, you generally use the lowest possible PWM frequency that you can get away with, since most energy is dissipated when the transistor switches. Minimizing the frequency minimizes the switching time. It's not unusual to PWM large DC motors at rates of 100-500 Hz. 
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Thanks for your comments.  This module is configured for a default PWM frequency of 25KHz but that can be changed as I'm controlling with the center slider and while I can set the frequency I need to do a SetSpeed to implement the new frequency and I'm changing just the frequency in order to show the effects of changing just the frequency (ie increasing the frequency in this slowed the motor as the duty cycle was unchanged), but I'm thinking you are right in that I've haven't explained it as well or as clearly as I should have.  Perhaps it would be better if the SetSpeed function was called SetDutyCycle (but SetSpeed is just that much more user friendly)?
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Jay Carlson

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Fran, I've always loved your candidness -- this was one of my favorite videos you've done so far. What you said at the end is spot-on -- there's a lot of evidence to suggest that struggling with a task (and eventually succeeding) is far more rewarding, stimulating, and healthy than working on projects you know you can do. We like to think of scientists and engineers as people sitting around, pulling great ideas out of the sky, and moving on. But real research and innovation takes a ton of work; as you said in this video, if it comes easy to you, it's probably trivially unoriginal, or you just got extremely lucky. Effort is everything!
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Jay Carlson

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I need to get rid of some CRTs -- I've got two matching 1280x1024 17" CTX monitors, one 1600x1200 19" ViewSonic monitor, and a 27" analog color TV. All free for the taking. Anyone want any/all of this stuff?
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Jay Carlson

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+Johnny Perez's presence on this social networking site is my sole reason for being here.
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Aw
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Jay Carlson

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I like the quick format. By the way, we pronounce Boise Idaho as "BOY-zee" 

Crazy Aussies... :-)
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Jay Carlson

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This is a great review. Love the VMWare virtualization bit -- I had no idea these Atom processors supported that! Thanks for the info; keep up the great work!
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Jay Carlson

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I just wish there were a social networking site I could go to where I had more friends than +Andy Boyle.
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I'm big in Brazil.
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Jay Carlson

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What does this do that I can't do on teh facebookz?
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Sooo...Google+ sucks?
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People
In his circles
44 people
Have him in circles
48 people
Colton Bailey's profile photo
Andy Boyle's profile photo
Dylan Nelson's profile photo
maralee jensen's profile photo
Robert Meyer's profile photo
Jake Roop's profile photo
Rob Krueger's profile photo
Sam Way's profile photo
Kristen Pinks's profile photo
Education
  • University of Nebraska-Lincoln
    present
  • Lincoln Southeast High School
  • Pound Middle School
  • Rousseau Elementary School
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Lincoln, NE
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