Replies to This Discussion

Permalink Reply by Arko on May 19, 2011 at 3:05pm

Juan! THIS LOOKS AWESOME!! Nice work man!

 

Where did you get the chassis? I've ended up designing my own chassis out of very lightweight aluminum, and it's out currently getting machined. I ordered 5 of my "drone" board, and I hope to see the PCB's shipped in the next few days. So there are some exciting things to coming soon.

 

With all this new hardware, we both have some PID tuning to do!

 

-Arko

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Permalink Reply by Juan Gomez on May 20, 2011 at 9:24am

Hi Arko!
Let me tell you that, I had built my own frame "made of balsa wood"  at the end of the last year. but... I spent a lot of time trying to build it and the most important thing: I spent something like 80 bucks to build it. So, i started to search "frames" in internet, and I found this page:
Main Page

Frame:
http://www.cnchelicopter.com/servlet/the-Q4-dsh-600-M.-Axis-Aircraf...

as you can see, it cost $124

By the way, Can you tell me how do you program the microcontroller in your board?. I mean do you used the bootload that came pre-programmed on the micro? or do you used the JTAG protocol to programme it?
I supposed that, you use the LMFlash program, right?

Regards

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Permalink Reply by Arko on June 13, 2011 at 12:06am

Got my new board! 

 

Soldered it all up and it worked the first time :)

 

So now it's time to refine the code and assemble the new chassis coming in next week. I can finally say it's a quadrotor when it's finished milling. Once the chassis and board+other components are together, I'm going to build a test apparatus to do a test flight.

 

I'm programming the microcontroller via JTAG right now, but I'm going to write a bootloader once I'm less occupied with other things. I'm using the IAR environment and uploading/debugging with it.

 

 

 

 

 

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Permalink Reply by Markus Savonen on May 25, 2011 at 5:25am

What Kalman Filter you are using?

(9-DOF) MPU-60XX + Cortex M4 would be pretty interesting combination...

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Permalink Reply by Arko on June 13, 2011 at 12:09am

It's a custom made Kalman Filter, nothing too fancy. I'm going to release the code in July along with a power point explaining all the code (probably make a video on it too). 

 

That's a neat sensor you mentioned... I think I might use it in a later board :)  Opens up a lot of real estate.

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Permalink Reply by Markus Savonen on June 13, 2011 at 12:46am

I have tried to find example code of sigma-point kalman filter with poor results...

Offtopic: Iv found that the maximum sample rate is 200 Hz if you are using quaternions or rotation matrix with sensor fusion. You can still read data from gyro/acc with max sample rate. I think that 200 Hz would be enough for orientation estimation, but it is not prolly enough for PID controller. I was wondering if it is possible to calibrate gyro data with sensor fusion output and use that for proportional component (gyro drift cancelling). I guess that gyro data could be used for derivative component without calibration (drift does not have effect).

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Permalink Reply by Arko on August 23, 2011 at 11:43pm

The picture is a bit out of date, but the quadrotors IMU and control code is complete. All that's left now is improving hardware to reduced high frequency vibrations from the motors, as well as new props. The control board is going through it's final redesign with tons of new features and hardware. My target price tag is $150 so hopefully within the next month or two we should see the board hit the market (I will provide details very soon!!). Within the next week I plan to be properly balancing on 3 axis (roll,pitch,yaw).

I've also included a video of the new kalman filter, let me know if you have any suggestions:

 

Attachments:

• quadonmount.jpg, 487 KB

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Permalink Reply by John Leichty on August 24, 2011 at 9:48pm

I randomly found myself looking at your project page a few days ago, and then saw the thread here. Awesome board, keep up the good work. Looking forward to seeing it fly.

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