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Electronic engineer Research professor Robotics specialist Navigation expert

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Francois du Plessis commented on leonardthall's blog post ArduCopter 2.9 PID Loops for STABILIZE, ACRO and ALT_HOLD
May I ask what the rationale is behind the feedforward link in the first part of the yaw control?  It does not quite make sense to me.
Aug 19, 2013
Francois du Plessis replied to criro1999's discussion Quadcopter w/APM2 not working on Caribbean?
"It is probably your magnetometer. The magnetic declination will differ drastically between Montreal and the Caribbean. The navigation Kalman filter uses the magnetometer with the GPS and IMU to get the position and orientation. If the declination is…"
Jan 23, 2013
Francois du Plessis posted a discussion
Hallo.  Can anyone help me?I powered up a new APM2 board today and the board does not boot.  Whenever I reboot the board it immediately goes into a state where it alternates between flashing the yellow (B) LED and the red and blue (C and A) LEDs.…
Sep 10, 2012
Francois du Plessis posted a discussion
HalloI need some assistance.  We are using APM2 on a DJI quad.  We have a problem going into first flight.  We have done all the ground tests such as levelling, CLI motor testing and ESC calibration (manual and automatic), but the moment that we…
Jul 31, 2012
Francois du Plessis replied to BoBo Flight's discussion Getting Started: Part 2
"Hi BoBo(?)
You are nearly addressing a question of mine.  I am not an RC-anything expert.  I am looking at integrating the ArduPilot into an existing multicopter frame, but the info on the power connections and requirements is a bit sketchy in the…"
Apr 3, 2012