Stephane Rocca
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Stephane Rocca's Discussions

APM DCM axes convention

Started Jan 2, 2013 0 Replies

Hi all,I'm a bit messed about the axes orientation used in the DCM code implementation in ardu/pilot/plane/copter code.Regarding to datasheet :MPU6000 is right handed with Z axis pointing up (on the…Continue

Magnetometer support in new APM code

Started Dec 14, 2010 0 Replies

Hi all, I'm trying to get the best result from my magnetometer, without a big succes at the moment !As explained here :…Continue

Tags: matrix, apm, magnetometer

Hacking the APM (just a bit !!)

Started Nov 24, 2010 0 Replies

Hi all, Following this thread (look at the picture) :http://diydrones.com/forum/topics/open-pins-on-apmoilpan I'd like to know…Continue

Optimal power supply

Started this discussion. Last reply by Stephane Rocca Nov 24, 2010. 2 Replies

Hi all, I saw some recommandations with powering the APM with only 2S 7.4V lipo battery through the 5V linear regulator on the Oilpan.But I'll need a 3S 11.1V or 4S 14.8V to power my servos AND the…Continue

 

Stephane Rocca's Page

Latest Activity

Stephane Rocca commented on Jack Crossfire's blog post 3 axis brushless gimbal
"Well, great job at this stage Jack. I assume you extract euler angles properly, from your computed matrix transform, before applying any correction don't you ? If so, your remaining problems are an illustration of the jerky behavior because of…"
May 25, 2013
Stephane Rocca commented on Roberto Navoni's blog post VR GIMBAL ( Board Control and IMU ): We are ready for developer.
"Thinking about it again... In fact it would be nice to produce a new PID function, that could take an additionnal new input value : the amount of the measured error that has to be imputed to anything else than the PID itself. It would prevent the…"
May 20, 2013
Stephane Rocca commented on Roberto Navoni's blog post VR GIMBAL ( Board Control and IMU ): We are ready for developer.
"In fact it's a big headake, that has to be resolved on the math side to be affirmative. It's difficult to get a good matrix mental representation : how it rotates and turns, and combines of course. So I spoke to quick, you're true…"
May 20, 2013
Stephane Rocca commented on Roberto Navoni's blog post VR GIMBAL ( Board Control and IMU ): We are ready for developer.
"ERRATUM: your gimbal is PITCH last, so inverse roll and pitch in my comments"
May 19, 2013
Stephane Rocca commented on Roberto Navoni's blog post VR GIMBAL ( Board Control and IMU ): We are ready for developer.
"Yes, I think so... It will be possible with 2 potentiometers on 2 first axis Yaw and Pitch (but it's additionnal friction, and not easy to adapt). Other existing solutions are expensive (this is what Zenmuse does at a very competitive…"
May 19, 2013
Stephane Rocca commented on Roberto Navoni's blog post VR GIMBAL ( Board Control and IMU ): We are ready for developer.
"I'm sorry Roberto, but with 1 IMU on camera, and 1 IMU (or AHRS) on main board, it's impossible. Actual 2 axis gimbal uses PID to control attitude, because you know that a "pitch action" will act on the "pitch axis…"
May 19, 2013
Stephane Rocca commented on Roberto Navoni's blog post VR GIMBAL ( Board Control and IMU ): We are ready for developer.
"It's too bad Roberto, as Jack said, I'm afraid it won't work, even with 1 IMU for each axis, because you'll ever get some misalignment between the 3 attitudes estimation. Even with a very accurate initialization position + the…"
May 19, 2013
Stephane Rocca posted a discussion

APM DCM axes convention

Hi all,I'm a bit messed about the axes orientation used in the DCM code implementation in ardu/pilot/plane/copter code.Regarding to datasheet :MPU6000 is right handed with Z axis pointing up (on the component view) ?HMC5883L is left handed with Z axis pointing down (on the component view)?On the arduimu picure, I believe there is an error in the MPU axes representation, regarding to datasheet, is that true…See More
Jan 2, 2013
Stephane Rocca commented on Max Bruner's blog post R10 Maiden flights and other videos!
"Ok, so it's a kind of DCM fusion algo ? No kalman so ? Did you compare your fusion algo to DCM implementation ?"
Nov 6, 2012
Stephane Rocca commented on Max Bruner's blog post R10 Maiden flights and other videos!
"It appears to be very smooth, congrats Max... What sensor fusion algo do you use to achieve 800 Hz ?"
Nov 6, 2012
Stephane Rocca commented on Roberto Navoni's blog post FoxTeam present last update on VBRAIN project : Benchmark of Arducopter firmware on APM , MP32F1 and VBRAIN and a lot of new video :)
"@Emile What kind of USB tool are you using to download to flash the MCU ? What is the compiled file format to upload with that tool ?"
Oct 19, 2012
Stephane Rocca commented on Roberto Navoni's blog post FoxTeam present last update on VBRAIN project : Benchmark of Arducopter firmware on APM , MP32F1 and VBRAIN and a lot of new video :)
"I agree with you, I don't see very well the advantage of RTOS : it increases the complexity of reading and writing code by the community. But porting ardupilot or arducopter on STM32F4 (which is a very powerfull MCU and I think a good choice)…"
Oct 18, 2012
Stephane Rocca commented on Roberto Navoni's blog post FoxTeam present last update on VBRAIN project : Benchmark of Arducopter firmware on APM , MP32F1 and VBRAIN and a lot of new video :)
"Hi Robero, did you write code for PX4 board ? Did you compiled something without Nuttx ? I'd like to know if there is existing code for this board, but without any RTOS. Just initializing FPU GPIOs, SPI, I2C, Uart (eventually main drivers to…"
Oct 18, 2012
Stephane Rocca commented on PX4's blog post Introducing the PX4 autopilot system
"Great board for sure... To summerize about my tweaking needings :The board require an external regulator to provide 4.3 - 6 V INPUT voltage ?And we can feed the board by the pins 1 and 2 of the expansion connector, or by pin 1 of the multi connector…"
Jul 26, 2012
Stephane Rocca commented on Bill Nesbitt's blog post AutoQuad FC fw v6.6
"I will take a closed look at it, tx Bill"
Jul 3, 2012
Stephane Rocca commented on Bill Nesbitt's blog post AutoQuad FC fw v6.6
"400 Hz is impressive, but with 40% idle, we can improve that a bit, is that true ? Is this output driven by an interrupt ? On what source file should I look to understand the structure of this IMU output refresh, please ?"
Jul 3, 2012

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About Me:
French. Developper, especialy on software.
Please tell us a bit about your UAV interest
To develop civil application about aerial photography.

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