James Cotton
  • Male
  • Houston, TX
  • United States

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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…


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.…


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…


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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