James Cotton
  • Male
  • Houston, TX
  • United States
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James Cotton's Page

Latest Activity

James Cotton commented on Dave Giles's blog post OFM Hyper 330 FPV Pod Racing Quadcopter with DMT (Dynamic Motor Tilting)
"I did something similar with a tricopter a while back: http://buildandcrash.blogspot.com/2013/04/triblivion-and-sparky.html it was quite a lot of fun. Nice work!"
Apr 7, 2015
James Cotton commented on James Cotton's blog post BrushedSparky v0.2
"It will be!"
Mar 26, 2015
Linjieqiang commented on James Cotton's blog post BrushedSparky v0.2
"good ! Is it open source?"
Mar 25, 2015
Crispin commented on James Cotton's blog post BrushedSparky v0.2
"That looks really cool. "
Mar 25, 2015
James Cotton posted a blog post

BrushedSparky v0.2

This is an update on the BrushedSparky that I posted about a month ago.I got version 0.2 back.  There are a number of improvements over the previous…See More
Mar 25, 2015
James Cotton commented on James Cotton's blog post BrushedSparky - TauLabs integrated frame FPV brushed microquadcopter
"Hehe. I'm almost done with the next revision to keep moving that way."
Mar 1, 2015
HeliStorm commented on James Cotton's blog post BrushedSparky - TauLabs integrated frame FPV brushed microquadcopter
""Also since I know the inevitable torrent of questions about this is going to be "where can I get one", I'm working with someone to try and get them manufactured. In the mean time I'll likely make a few for friends and…"
Mar 1, 2015

Developer
Randy commented on James Cotton's blog post BrushedSparky - TauLabs integrated frame FPV brushed microquadcopter
"Yeah, that is really cool."
Mar 1, 2015
F. C. Bearsch commented on James Cotton's blog post BrushedSparky - TauLabs integrated frame FPV brushed microquadcopter
"very cool!"
Mar 1, 2015
Euan Ramsay commented on James Cotton's blog post BrushedSparky - TauLabs integrated frame FPV brushed microquadcopter
"Lol - groovy stuff!"
Mar 1, 2015
James Cotton posted a blog post

BrushedSparky - TauLabs integrated frame FPV brushed microquadcopter

 OsoGrande got me into brushed microquadcopters recently. Sparky2 has some buffered outputs so at first I was just slapping it on frames and jury rigging things together. Very quickly, I wanted something more elegant.…See More
Feb 28, 2015
Tobias Witting commented on James Cotton's blog post OneShot125 latency testing
"this video shows a direct comparison of PWM and Oneshot: https://www.youtube.com/watch?v=b1BX3TDD28g"
Feb 2, 2015

Distributor
RC Tech.se commented on James Cotton's blog post OneShot125 latency testing
" @ Hugues: It provides a faster update to the ESC and hence better control of the ESC/aircraft craft."
Feb 1, 2015

MR60
Hugues commented on James Cotton's blog post OneShot125 latency testing
"This is chinese to me without getting a minimum of contextual information. never heard of one shot esc. Sounds like a disposable esc you use one shot :p"
Feb 1, 2015
Matthias Badaire commented on James Cotton's blog post OneShot125 latency testing
Feb 1, 2015
titeuf007 commented on James Cotton's blog post OneShot125 latency testing
"i hope we could see this option in a near futur for arducopter"
Feb 1, 2015

Profile Information

About Me:
OP Dev
Please tell us a bit about your UAV interest
I like them, they are fun

James Cotton's Blog

BrushedSparky v0.2

Posted on March 25, 2015 at 4:00pm 3 Comments

This is an update on the BrushedSparky that I posted about a month ago.

I got…

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BrushedSparky - TauLabs integrated frame FPV brushed microquadcopter

Posted on February 28, 2015 at 5:27pm 5 Comments

 

OsoGrande got me into brushed microquadcopters recently. Sparky2 has some buffered outputs so at first I was just slapping it on frames and jury rigging things together. Very quickly, I wanted something more elegant.…

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OneShot125 latency testing

Posted on February 1, 2015 at 9:00am 6 Comments

I thought you guys might find this interesting. Support for OneShot ESCs was recently written for Tau Labs (http://taulabs.org) and it seems like most of the claims that it is good are largely subjective (which is…

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Tau Labs Altitude control loop architecture and INS tuning

Posted on March 14, 2014 at 9:30pm 15 Comments

So for the last week or two I have been looking a bit at the performance of the Tau Labs altitude control and INS filter we have and the altitude control loop.

 

One issue I was suffering from is that the velocity estimate would be biased because of variations in the accelerometer bias. I switched to using a 16 state version of the INS written by Dale Schinstock that included an estimate of the bias terms for…

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