Caleb Chamberlain
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  • Provo, UT
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Caleb Chamberlain's Discussions

New multi-rotor autopilot

Started this discussion. Last reply by Sandeep Bajare Jan 11, 2013. 7 Replies

Putting the Rotorcraft/Accelerometer Question to Rest

Started this discussion. Last reply by Caleb Chamberlain Oct 10, 2011. 14 Replies

 

Caleb Chamberlain's Page

Latest Activity

Nikola Rabchevsky replied to Caleb Chamberlain's discussion Open Source Attitude Estimation Code with Euler Angle and Quaternion Support
"Is the source code for the most recent firmware (UM3?) and version 3.0.x of the CHR Serial interface program available anywhere?  Seems like the Sourceforge repositories are a bit out of date."
Sunday
Caleb Chamberlain commented on Chris Anderson's blog post FAQ: What's the difference between a gyro and an accelerometer? Do I need both?
"Not to resurrect this thread, but I just published a brief explanation of how to combine rate gyro and accelerometer data: http://www.chrobotics.com/library/attitude-estimation"
Nov 22, 2013
legacy replied to Caleb Chamberlain's discussion Open Source Attitude Estimation Code with Euler Angle and Quaternion Support
"i am interested about centripetal compensation code =)"
Oct 29, 2013
Caleb Chamberlain commented on Chris Anderson's blog post FAQ: What's the difference between a gyro and an accelerometer? Do I need both?
"Mario - instead, can you measure the wheel velocity and regulate it so that it is constant on a slope or on a flat surface?  It seems like that would be an easier solution."
Oct 11, 2013
Sandeep Bajare replied to Caleb Chamberlain's discussion New multi-rotor autopilot
"hi, I need to purchase this, pls give link where it is available. regds sandeep"
Jan 11, 2013
Caleb Chamberlain commented on Matthew Beck's blog post 3d printable quadcopter!! PL1Q Vampire
"Pretty cool!  How much does the printed frame weigh?"
Feb 17, 2012
Allen Babb replied to Caleb Chamberlain's discussion Open Source Attitude Estimation Code with Euler Angle and Quaternion Support
"Just reference to the Earth gravity vector, and use an arctangent function to find the X and Y Euler angles. Be careful about linear accelerations, as they'll throw off your calculations. Note: the Z Euler angles will be invalid most of the…"
Oct 16, 2011
Caleb Chamberlain replied to Caleb Chamberlain's discussion Putting the Rotorcraft/Accelerometer Question to Rest
"@Alex   Why do you want to use just accelerometers? You can add gyros without increasing your footprint size - Invensense sells a chip that combines gyros/accels into one small package and a common communication interface.   You COULD use…"
Oct 10, 2011
Alex replied to Caleb Chamberlain's discussion Putting the Rotorcraft/Accelerometer Question to Rest
"Thanks for your helpful post Caleb. Would you possibly know an answer to the following question:   Attitude estimation with ONLY 3axis ACCELEROMETERS. and nothing else, based on a lowpass filter? where can I find an opensource way to do…"
Oct 10, 2011
Alex replied to Caleb Chamberlain's discussion Open Source Attitude Estimation Code with Euler Angle and Quaternion Support
"Attitude estimation ONLY 3axis ACCELEROMETERS.   Dear DIYdrones friends, I'm looking for an Attitude Estimation algorithm, and only have 3 axis accelerometers. I know this will may not be optimal, and will be slow. But, if you know an…"
Oct 10, 2011
Caleb Chamberlain replied to Caleb Chamberlain's discussion Open Source Attitude Estimation Code with Euler Angle and Quaternion Support
"@Bot   That's great!  I'll look forward to seeing what you come up with."
Sep 26, 2011
Bot Thoughts replied to Caleb Chamberlain's discussion Open Source Attitude Estimation Code with Euler Angle and Quaternion Support
"I'm probably going to be working on something similar over the next few months. Maybe even with the 6DM that I bought. If I ever have something to show for my efforts, will let you know. :)"
Sep 25, 2011
Caleb Chamberlain replied to Caleb Chamberlain's discussion New multi-rotor autopilot
"I see.  Actually, I know of no single reference that is available right now.  I learned about most of this stuff while working on my MS thesis."
Sep 17, 2011
Akshay Verma replied to Caleb Chamberlain's discussion New multi-rotor autopilot
"References about autopilot design, what all instruments are included and how to design them?"
Sep 17, 2011
Caleb Chamberlain replied to Caleb Chamberlain's discussion New multi-rotor autopilot
"@Tom,   I originally designed it to sell as a drop-in replacement for the Mikrokopter autopilot, and as the autopilot for a potential new quadrotor product.  A few higher-priority projects have taken precedence, though, so I haven't…"
Sep 16, 2011
Caleb Chamberlain replied to Caleb Chamberlain's discussion New multi-rotor autopilot
"@Akshay,   What references are you talking about?"
Sep 16, 2011

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