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Hugues's Discussions

How to configure CAM_TRIG_DIST to ouput a PWM signal from a Pixhawk output ?

Started this discussion. Last reply by Hugues Mar 4. 5 Replies

Hi,I would lile to use the Survey function in mission planner which uses the CAM_TRIG_DIST method to trigger a camera at regular distance intervals.I'm using an infrared camera trigger which is activated by a PWM signal (configurable).The question…Continue

Is Minimosd incompatible with Sony NEX5R ?

Started this discussion. Last reply by Hugues Jan 7. 17 Replies

Hello,I'm trying to use my Sony NEX5 camera as a FPV camera using this HDMI AV converter :…Continue

NEVER connect a Capacitor backup or voltage protector on APM board

Started this discussion. Last reply by Hugues Nov 19, 2013. 71 Replies

Hi,Edit : from the posts below I deduce the issue seems specific to my config. Threfore I remove temporarily my request to add a line a caution in the wiki as it might not be a general problem for everyone, until further investigation and…Continue

Throttle channel 3 output either min, either max

Started Feb 7, 2013 0 Replies

Hello,I face a strange issue on my quadcopter 3DR:I calibrated the ESCs according to the following automatic procedure:1 Disconnect USB and battery. The entire system must not have power2 Turn your radio on and put the radio throttle stick at…Continue

Question about PITCH channel : what is forward, what is backward ?

Started Feb 3, 2013 0 Replies

hello,The question seems stupid but it is actually confusing for me to confugure the channel 2, pitch, on my Tx to correspond to what the wiki says : "CH 2: Pitch Forward = low PWM – Pitch Back = High PWM" Indeed , what is forward ? what is backward…Continue

[PROBLEM] Mission planner updater error

Started this discussion. Last reply by dudz Apr 17, 2013. 5 Replies

Hi,I launched today the mission planner that started an auto update. It starts downloading files updates (as visible in the console window) but after 2 minutes it stops with error, giving this display and error message:…Continue

LEDs use on APM2.5 board

Started this discussion. Last reply by TJ Feb 2, 2013. 1 Reply

Hello,I have seen a picture in the Wiki for the 2.0 APM board showing ouputs A9 to A4 being named "Motor LEDs".Is there any explanation what that is and how is it used ?For example can those outputs be used to power 12Volts LED strips ? (or is it…Continue

Programming with Arducopter/Arduino

Started this discussion. Last reply by duster3 May 6, 2013. 15 Replies

Hello,I would like to compile and upload the Arducopter code to my UAV. To do so I followed the instructions on the wiki, that is :-installed the Arduino 1.0.3 (Arudpilot) version on win7-installed the 2.8.1 software version (the two folders…Continue

Tags: Arducopter, Arduino, Programming

Sonar minimum distance ?

Started this discussion. Last reply by Leif Hedman Jan 9, 2013. 2 Replies

Hello,I have installed the sonar XLL-EZ0 on the quadcopter (3DR). Then I launch a sonar test though the CLI in the mission planner software. The arducopter is connected via USB only (no battery).The minimum reading with the sonar command is 20 cm.…Continue

Tags: EZ0, 3DR, Sonar

Power for analog pins (servos for roll/tilt, sonar, etc)

Started this discussion. Last reply by Hugues Dec 28, 2012. 3 Replies

Hi,On a 3DR quad arducopter, I am powering the APM2.5 with JP1 off and using the 5v input from the 3DR power module BEC (connects through the voltage measurement port).This powers , If I understood correctly, all of the APM2.5 boards including the…Continue

Tags: power, module, 3DR, servos, pins


Hugues's Page

Latest Activity

Hugues commented on Robert Haddad's blog post Adding External Configuration GPRS Telemetry Module to APM 2.6 or Walkera X350 Pro
"NIce. A question to configure the GCS part : i see your dronecell modem will send telemetry data to IP "" which should correspond to a UDP server listening on the GCS side. My question is how do you configfure mission…"
Hugues commented on Tim's blog post CBS This Morning piece about NYPD working on ways to disable drones
"This is typical negative sensationalism of journalism to increase their audience. +1 Herman, gangsters and terrorists do not need drones to carry out attacks that could be much more easily be done by foot, by car, in metro stations, etc"
Hugues commented on F. C. Bearsch "Tearig"'s blog post Rethinking the RC "Controller TX" - SuperMan FM Continued-
"A normal 2 dof tx stick has already the issue that a move along one dof generates parasitic moves on the second dof; therefore I'm not convinced a single 6 dof stick would be very practical for piloting a drone."
Hugues commented on Mark Harrison's blog post Behind the scenes on the OK Go shoot
"Wow, love it!"
Hugues commented on Hugues's blog post Review and tests of anti-vibration systems
"Thx Philip. Actually we should be able to use the IMUs we have for gimbals (i have a few laying around) to make the gyro measurements you are talking about, with a piece of arduino code. Any dev volunteering to develop this ?"
Phillip Schmidt commented on Hugues's blog post Review and tests of anti-vibration systems
"  Good job with the testing!  It's nice to see a well executed experiment accompanied by a solid write-up.  I would like to see this type of testing where both acceleration and angular rate are recorded simultaneously.  I…"
Oct 22
Hugues commented on benbojangles's blog post DIY Ghetto 5.8g wireless monitor project
"Nice, thx for posting. what's the total weight all in ?"
Oct 22
Geert Pirens replied to Hugues's discussion How to assign a receiver channel as a pass-thru Pixhawk ? in the group ArduCopter User Group
"FrSky X6R & X8R can do the same, 1-8 or 9-16 pwm-out.Although the X6R receiver has 1-6 or 9-14 pwm-out. As easy as 1-2-3 !!! "
Oct 21
Hugues commented on Sean Skirvin's blog post Meet the T1000, 1+hr flight times w/ 1kg payload
"Well Euan, you may be voluntarily missing this point for the sake of other as important ones : simplicity, security, costs, accessibility, ....These are some of the reasons why I would not venture into the heli world."
Oct 21
Hugues commented on Hugues's blog post Review and tests of anti-vibration systems
"very clean build. How many of these dampers do you use , 4 or 6 ? What are the dimension of these blue dampers ? The secraft dimensions are : "
Oct 21
Hugues commented on Gerard Toonstra's blog post Redesigning multirotor ESC's
"Very nice objective. However I do not see how you will implement points 1, partly 7 and point 9 as these depend on feedbacks sent by the motors to the ESC somehow. You project would thus need specially designed motors able to send to the ESC some…"
Oct 21
Gil Rosenthal commented on Hugues's blog post Review and tests of anti-vibration systems
"Hi Hugues, Yes - you are right, they also utilize only 6 rings rather than 8. However, they are implemented as a rectangular "polar" array - 4 units per gimbal - so this does cancel out a certain amount of side-to-side (XY plane) movement…"
Oct 21
Hugues commented on Hugues's blog post Review and tests of anti-vibration systems
"Hi Gil, these you bought are indeed very similar to the tested ones. However you have there a system with a single orientation of the o-rings, while the tested system uses two perpendicular sets of rings which improves the mechanical stability. Thx…"
Oct 21
Gil Rosenthal commented on Hugues's blog post Review and tests of anti-vibration systems
"Hi Hugues, Very pleased with your research and results, as I have just finished a heavy lifter using a similar O-ring system from FamousHobby. I am saying this as I hope to get you to do another set of tests, namely: A) Testing the O-ring layout…"
Oct 21
Hugues replied to Randy's discussion ArduCopter-3.2 beta testing
"Yes a R,C filter to convert the PWM pulses into an analog voltage signal that can be read by pixhawk, but I do not know what are the advised R,C values."
Oct 20
Hugues replied to Shane's discussion Arducopter just not reliable.
"Shane, nobody will apparently be able to help you out of your arducopter frustration. If you are happy with a closed commercial system such as Naza, then stick with it. This simply shows some people can't handle and/or do not like integration…"
Oct 20

Profile Information

Please tell us a bit about your UAV interest
Arducopter, Quad, Octocopters, X8 coaxial

Hugues's Blog

AirbotServices fixed wing - wing extensions testing

Posted on September 16, 2014 at 12:30am 17 Comments

AirbotServices fixed wing is based on the well known XUAV Talon EPO frame. This plane has a standard wingspan of 1720mm . Although its wings are quite wide (total wing surface is 60 dm2 -…


Comment Wall (8 comments)

At 10:26pm on March 19, 2013, Oliver said…

Hi, I just posted the parts list with some notes in the comments below my original post on the gimbal.



At 12:11am on March 20, 2013, Hugues said…


At 12:52pm on November 7, 2013,
Forrest Frantz

Didn't want to say this in the crowd.  But I think mass distribution has a bearing on the PIDs as does distance from the respective axis.

Example:  Say there is a rectangular cubic battery pointing fore and aft at CG on a symmetric quad copter.  Say the rotors are 20 cm from their axis and the battery is 10cm x 2 cm.

o The torque factor exerted in pitch over the battery would be 20/(10/4) = 8 to 1

o The torque factor exerted in roll over the battery would be 20/(2/4) = 40 to 1

If you have two steel wheels of the same mass, the larger one will be more difficult to get rolling (there is a larger change in momentum).

So it is 5x easier to roll than pitch.  I think that should be accounted for in the PIDs?  But maybe I'm wrong.

Of course this is an extreme example where everything else weighs nothing, so the differences in ratios are never that high.  But it is common I think for the factors to be up to 1.5X.

Your thoughts?

At 1:42pm on November 8, 2013, Tyler McGahee said…

Yeah, the PIDs are definitely affected by the "mass distribution" (moment of inertia), as well as by the motors and propellers and ESCs and the control algorithm and on and on. I don't think it hurts to list the PIDs though. Could save some time when starting from scratch on a similar or identical rig.

At 10:37pm on November 21, 2013, Alejandro Cadavid said…


A curiosity ... as I turn apm 2.5 and esc with 2 separate batteries.

Battery 1: APM 2.5 and FPV
Battery 2 Engines - BECS (servos)


Thank you!

At 7:28pm on March 11, 2014, Alejandro Cadavid said…

Ardupilot on PX4 + IO won't arm motors.

Hi I have the same problem Mystery 30A ESC's ...

You Might explain "load up the firmware ArduCopter" Bootload firmware?

System works without problem, arm and disarm perfectly.

Safety Switch OK.

Calibration OK, ENGINES TURN.

Connect and disconnect battery and ESC sounds uncalibrated, not save settings.

/ / / / / / / Can not save the ESC Mystery Calibration and PX4FMUIO / / / /

At 1:11pm on March 12, 2014, Alejandro Cadavid said…


/ / / / / / / Can not save the ESC Calibration in PX4 FMU IO / / / /

You know it could be?

Another question.

You know how I connect to OSD Remzibi px4 as if telemetry data and to see video on my monitor?

We appreciate evidence.

Thanks for you time.

You are responsible to give answers of diydrones community? curiosity!


At 8:11am on August 26, 2014,
Forrest Frantz

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