Francois du Plessis
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Francois du Plessis's Discussions

APM 2.0 boot problems

Started this discussion. Last reply by Graham Dyer Jan 24. 1 Reply

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…Continue

Quadcopter throttling problem

Started this discussion. Last reply by Francois du Plessis Aug 2, 2012. 7 Replies

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…Continue

 

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Francois du Plessis posted a discussion

APM 2.0 boot problems

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.  Red and blue flashes together.  I cannot connect to the board via the USB cable or though the wireless link.I can get limited connectivity through the terminal window.  The Tx light comes on briefly and then stops before the board goes into the…See More
Sep 10, 2012
Francois du Plessis replied to Francois du Plessis's discussion Quadcopter throttling problem
"It seems like we have sorted out our problem.  I am not sure which one carried the most weight, but we are flying. The first thing we did was to reset the APM board via the CLI interface as we were not getting any control signals when we…"
Aug 2, 2012
Nicolas Garza replied to Francois du Plessis's discussion Quadcopter throttling problem
"The Stabilize Control P seems to do something with it. I change the value from 4.5 to 0.45 and the motors slowed down, but they were still too fast. I lowered the value to 0.001 and the motors slowed down a little bit more, but it remains too fast…"
Aug 1, 2012
Nicolas Garza replied to Francois du Plessis's discussion Quadcopter throttling problem
"Ok, for some reason the value of P in Angular Rate Control was at 0.185, even though the recommended rates are between 0.145 (for small motors) and 0.090 (for big motors) so at that value was way off boundaries, so I assume the system was thinking…"
Aug 1, 2012
Nicolas Garza replied to Francois du Plessis's discussion Quadcopter throttling problem
"Haha, I was about to post the same thread as I have exactly the same problem, and almost your same setup (APM1.4 and DJI frame). I just reflashed my esc's with simonk's firmware and I thought that was the problem but it works normally if I…"
Aug 1, 2012
Francois du Plessis replied to Francois du Plessis's discussion Quadcopter throttling problem
"Tim Thanks, we have looked into that and it does not seem to be the problem.  But, I am open to suggestions if we are missing something. Jason (and Tim) I have attached the log file and the parameters list.  The log file was recorded for…"
Aug 1, 2012
Tim Powell replied to Francois du Plessis's discussion Quadcopter throttling problem
"Check your radio calibration.  If minimal throttle is acting like full throttle you might need to recalibrate."
Jul 31, 2012

Developer
jasonshort replied to Francois du Plessis's discussion Quadcopter throttling problem
"can you post your parameter list and a flash flight log downloaded from the APM? Jason"
Jul 31, 2012
Francois du Plessis posted a discussion

Quadcopter throttling problem

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 give the system some throttle (one click on the stick) while in Stabilize mode, the motors go to maximum speed.  We have repeated the levelling and the ESC calibration and have managed on 2 occasions to not get the aggressive speed response, but we…See More
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…"
Apr 3, 2012

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About Me:
Electronic engineer
Research professor
Robotics specialist
Navigation expert
Tell us a bit about your UAV interest
Somewhat academic
Somewhat commercial
Somewhat hobbyist
Hometown:
Auckland Park

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