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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 replied to Scott's discussion V3.1.5 in the group ArduCopter User Group
"I would encourage and push this polygon geofence functionality. It adds security in zones where a cylinder shape fence does not fit and will be a big plus to certify APM toward the European regulators (future commercial flights)."
Hugues commented on Nick Arsov's blog post AUAV-X2 ( the revised version of X1 ) is alive
"@Steven, I do not understand Sgt Ric's comment was in reaction to your post. About rcgroups I find it impossible to express different opinions without offending some "high" guys who think they detain the truth. "
Hugues commented on Thomas J Coyle III's blog post Snakebot and quadcopter combo makes for a go-anywhere rescue drone
"HELP Where's Optimus Prime ?"
Hugues commented on Patrick Duffy's blog post How to build a High-Definition FPV UAV using a Rasperry PI with HD camera, using a high speed WiFi link
"On the ground side (mission planner for ex), how do you retrieve the telemetry data from the IP stream downlink (containing both video+telemetry) ?"
Hugues commented on Greg O's blog post Frsky Tarais spoken flight mode guide
"Thx, I have learned a new way to program flight modes on the Taranis."
Hugues commented on Patrick Duffy's blog post How to build a High-Definition FPV UAV using a Rasperry PI with HD camera, using a high speed WiFi link
"Well done! A true diy project. Can you explain a bit more why you have chosen WiFi over 433,900 or 1.3 transmission? "
Hugues commented on Stefan78's blog post Unmanned Parcel Delivery is a reality!
"DHL will have to change their UAV choice as the European drone regulations will require minimum 6 rotors, for obvious safety reasons.No quads will survive in the drone commercial applications in our continent..."
Sep 24
Hugues commented on Hugues's blog post Powering your APM drone (or how not to shutdown APM like the US gov would) - practical build log
"Thx Parker for noticing. I've updated the diagram."
Sep 24
Hugues replied to Elios's discussion Best Combination of Motors, prop and batteries for the X-UAV Talon for the Longer flight Distance
"On Rcgroups you find experiments from a known XUAV Talon flyer with the following config: (rcgroups thread here : -MN3508-29 380kv motor -15x5.5 props -6S Li-Ion batteries 6S2P…"
Sep 24
Hugues replied to John G.'s discussion my new book on how to build a drone is free this weekend!
"+1. Can't get it without a kindle which I do not have and do not wish to have. A PDF version would be the simplest way."
Sep 23
Hugues posted a blog post

Powering your APM drone (or how not to shutdown APM like the US gov would) - practical build log

Figure 1: general wiring diagram for an 8 motors & APM drone Practical build blog: powering your APM drone (or don’t  brownout an APM like the US gov…See More
Sep 23
Hugues replied to Adrian's discussion XUAV Talon - Multistar Low kV power plant in the group X-UAV Talon
"i would transmit an advice I received from senior guys flying the Talon, that is not to start with a 6S configuration because : it is too heavy, it does not give you as much thrust to take off easily (low Kv), it requires more dangerous large…"
Sep 23
Hugues replied to Peter Everett's discussion Pixhawk error, anybody know what these tones mean please?
"Sorry to hijack your topic Peter, but I find you have got an excellent gimbal performance in your YouTube video link. Can you please provide details about the gimbal itself, the camera and your alexmos pic tuning values? Thx"
Sep 22
Hugues commented on Rob_Lefebvre's blog post Arducopter Flies Gas Powered Helicopter
"@Rob, sorry to hear about your crash. Rebuild and go on ! Crashes are the path to learning as we have all experienced...(unfortunately)"
Sep 22
Parker commented on Hugues's blog post Powering your APM drone (or how not to shutdown APM like the US gov would) - practical build log
"Oh, I noticed it.  I'm sorry."
Sep 22
Parker commented on Hugues's blog post Powering your APM drone (or how not to shutdown APM like the US gov would) - practical build log
"Hello Hugues. That's a very clear explanation for our. But is the connection of receiver in Fig.1 wrong, isn't it? I think it's reverse. My friend's broke the receiver  by that reason and told then. Thanks."
Sep 22

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 -…


PIXHAWK powering critical attention points - Wiki complementary information

Posted on June 15, 2014 at 12:11pm 25 Comments


Integrating troubleshooting results from quite a few people describing power problems with Pixhawk or Pixhawk getting out of control (linked to ESCs' signal wires connected without a ground reference) I thought the current wiki information should be completed/updated with a synthesized diagram that…


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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