Dave_fr's Discussions
Virtual compass for ardupilot = even faster and pinpoint navigation ???
Started this discussion. Last reply by Ryan Beall Aug 25, 2009. 34 Replies 0 Likes
Connecting gyros to ardupilot
Started this discussion. Last reply by Chris Anderson Aug 22, 2009. 3 Replies 0 Likes
Getting familiar with the projet.
Started this discussion. Last reply by Chris Anderson May 2, 2009. 2 Replies 0 Likes
Dave_fr's Page
Latest Activity
Dave_fr commented on Ben Levitt's blog post 'UDB4 Available Today from SparkFun'
Thanks for your answers !
But then, why not selling the UDB with a bootloader already installed ?
Dave_fr commented on Ben Levitt's blog post 'UDB4 Available Today from SparkFun'
I'm trying to load the code with PicKit2. I use pickit2 as standalone with the pickit2 associated software. I connect the board with the triangle on the pickit2 facing the dash on the UDB4, power it with external 5 volt power source. After…
Dave_fr replied to Chris Anderson's discussion 'Discussion forum for UAVDevBoard, Sparkfun's 3-axis IMU-based autopilot board'
Thanks Bill !
Dave_fr replied to Chris Anderson's discussion 'Discussion forum for UAVDevBoard, Sparkfun's 3-axis IMU-based autopilot board'
I just ordered a udb4 board. I've installed mplab along with the c30 compiler evaluatation version on two differents computers. When I try to compile the matrixpilotV3.2 for udb4 I get the same error on both computers…
Dave_fr commented on Ben Levitt's blog post 'UDB4 Available Today from SparkFun'
Can someone tell me wether picKit2 would be ok to program it ?
Dave_fr replied to Chris Anderson's discussion 'Discussion forum for UAVDevBoard, Sparkfun's 3-axis IMU-based autopilot board'
Hi Doug,
To compute the angle of attack pitch is not really needed unless use in conjuction with vertical velocity and airspeed. What is really important though is airspeed, mass and Acceleration. The formula that links the lift, threrefore Z…
Dave_fr replied to Tom P's discussion 'Euler/rotation matrix/DCM help'
Hi Tom,
You should disassociate rotation and Euler angles. Euler angles are state parameters more commonly known as pitch roll and yaw whereas rotation is the state transition that describes how the state (euler angles) change ( how the plane…
Dave_fr commented on Paul Bizard's blog post 'Matlab/Simulink/AVL simulator'
Thanks Michael for the link. Looks extremely intresting cf 8)
Dave_fr commented on Paul Bizard's blog post 'Matlab/Simulink/AVL simulator'
Sorry, I don't...
Apparently, this method is widely used nowadays. I started experimenting but I still have to work out the formulas which link the modified rodrigues parameters to Euler angles. As you can see, there still is a singularity for…
Dave_fr commented on Paul Bizard's blog post 'Matlab/Simulink/AVL simulator'
Paul, I don't know if you have already seen this NASA paper. It deals with the attitude estimation using EKF and modified rodrigues parameters. It first justifies the use of the Rodrigues parameters for the following reasons :
Source :…
Dave_fr replied to Matthew M's discussion 'MediaTek MT3329 GPS 10Hz'
Hi Gilles,
Thanks for your help !
Dave_fr replied to Matthew M's discussion 'MediaTek MT3329 GPS 10Hz'
You have to set the right baud rate. Otherwise on some terminal you will see the strange caracters. As an example mine runs at 38 400 bauds default settings.
But as I Asked above, I don't know you to change settings on the GPS...
By the WAY,…
Dave_fr replied to Matthew M's discussion 'MediaTek MT3329 GPS 10Hz'
Can someone tell me how to change the factory settings (bds rate, update rate ect...).
Dave_fr replied to Matthew M's discussion 'MediaTek MT3329 GPS 10Hz'
lol I thought I had deleted my previous message. A few minutes after posting I realized that I hadn't connected the backup power supply pin to 3.3V so it didn't work. Now it's fine. Thanks,
Dave_fr replied to Matthew M's discussion 'MediaTek MT3329 GPS 10Hz'
I received mine today. I connected, Vcc to 3.3 volts, GND to 0V, nothing comes out of TX pin.
Can somone help me ?
Dave_fr replied to William Premerlani's discussion 'robust estimator of the direction cosine matrix'
VxU=W where W is a vector that is perpendicular to the two others and his lenght equals to ||V||*||U||*sin(Angle) where Angle is the angle between the 2 vectors.
Sin function is very linear as you get close to 0. Now, because the Angle between the…
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