Andrew Tridgell
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  • Canberra, ACT
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Andrew Tridgell's Discussions

APM:Plane 2.76 released

Started this discussion. Last reply by Glen Wimberley Feb 5. 30 Replies

I've just released APM:Plane 2.76 with an important bug fix.Please see the release announcement for details.Continue

APM:Plane 2.75 released

Started this discussion. Last reply by Andrew Tridgell Nov 12, 2013. 29 Replies

APM:Please 2.75 has now been released.Have a look at the release notes in the forum for lots of details on the…Continue

APM:Plane 2.74 released

Started this discussion. Last reply by Cala Dec 23, 2013. 810 Replies

The APM dev team is delighted to announce the release of APM:Plane 2.74, a major new release with a lot of new…Continue

ArduPlane 2.74beta3 released

Started this discussion. Last reply by Andrew Tridgell Jul 15, 2013. 18 Replies

I've just released ArduPlane 2.74beta3. I'm hoping this will be the last beta before the 2.74 release. Please test it as much as you can!The simplest way to try it is to use a pre-built firmware from…Continue


Andrew Tridgell's Page

Latest Activity

RoboBill replied to Andrew Tridgell's discussion How should we handle reverse in ArduRover? in the group ArduRover User Group
"I realize there are more pressing matters, but what is the latest regarding reverse? I'm happy to try your beta if and when it becomes available."
10 hours ago
William Davidson commented on Andrew Tridgell's blog post APM:Plane 3.0.0 released
"Really interested in the parachute recovery as well. This type of feature is required for some of the environments we need to fly in. Also, Auto TO looks fantastic. What is needed to implement Auto TO with regard to mission planning? Have not…"

Marco Robustini commented on Andrew Tridgell's blog post APM:Plane 3.0.0 released
"Happy Heaster!Marco "

Graham Dyer commented on Andrew Tridgell's blog post APM:Plane 3.0.0 released
"Just a repeat of the thanks to the guys who made this possible and once again for all the work that went into this. We flew a couple flights today with our problem child and I'm very pleased to report that there is nothing untoward to…"
Apr 16
James Overington commented on Andrew Tridgell's blog post A peek into the future of ardupilot
"Hi Victor, the sensor board I have is the GY88 (MPU-6050, HMC5883L, BMP085). BeaglePilot+1"
Apr 16
Víctor Mayoral commented on Andrew Tridgell's blog post A peek into the future of ardupilot
"Hi James, I'm finishing some tweeks with the MPU-9150 driver for ardupilot and once i finish i will try to replicate your steps and come back with feedback.Which 10 dof sensor board are you using? Have you joined BeaglePilot google group? "
Apr 16
James Overington commented on Andrew Tridgell's blog post A peek into the future of ardupilot
"I have successfully followed the wiki on 'building for the Beaglebone Black on Linux' found here. I connected a cheap 10 dof sensor board and have confirmed the i2c connection. I have compiled the Arducopter code with no errors and…"
Apr 16

Andrew Tridgell replied to Mark Van Haze's discussion Kerosene jet with Arduplane crash analysis
"Hi Mark, I had a quick look at the log and while it is hard to tell for sure, it is clear that your attitude solution was not good. There are a number of sensor anomalies that may explain that: the compass shows the total magnetic field stength…"
Apr 13

Andrew Tridgell replied to Menno Hochstenbach's discussion uBlox compass configuration problems - east is west
"There is no hemisphere difference. The calibration works the same in both northern and southern hemispheres. In fact, the current compass calibration code was developed by people in Australia. Cheers, Tridge "
Apr 11

Andrew Tridgell replied to FPVGenie's discussion Pixhawk power supply questions on Airplane
"The PM module is vital. You really are risking a bad crash if you don't use it. I've looked at a lot of traces with an oscilloscope of what happens to the servo rail for rapidly moving servos, even with very high current BECs (20A or more)…"
Apr 11
Yi Zheng commented on Andrew Tridgell's blog post APM:Plane 3.0.0 released
"Thank you so much for excellent jobs.  The fun of RC model is not only flying but also understanding more behind. Great jobs and great opensource. Yi"
Apr 11

Andrew Tridgell commented on Trent at MyGeekShow's blog post Long Range Telemetry Testing
"Note that it is a RFD900, not a RDF900 (it was designed by RFDesign in Australia). Also note that if you use a RFD900 you need to be VERY CAREFUL with how you power it. For in the aircraft you should not just run it at 30dBm (1W) off the telemetry…"
Apr 10
Swift commented on Andrew Tridgell's blog post APM:Plane 3.0.0 released
"Thank you Tridge and the Team, Amazing!"
Apr 10
RaptorUAS MD commented on Andrew Tridgell's blog post APM:Plane 3.0.0 released
"Thanks Andrew,  Actually parachute landings is something I want to implement because it solves a number of problems with having reliable autonomous landings in a broad range of terrains,  Having separate control/channel for two moving…"
Apr 10

Andrew Tridgell commented on Andrew Tridgell's blog post APM:Plane 3.0.0 released
"@RaptorUAS, Another thing we are working on is automated parachute deployment in case of a range of failures. That has been recently added for APM:Copter and we plan on adding it in the plane code as well. A parachute on a plane is complex of…"
Apr 10

Andrew Tridgell commented on Andrew Tridgell's blog post APM:Plane 3.0.0 released
"@RaptorUAS, yes, it is possible, but the problem is defining a failure. You could load the OBC failsafe module which will give you a heartbeat from the FMU, and use that to drive a failover to another board, but it would only work if the FMU…"
Apr 10

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About Me:
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Lead developer for APM:Plane and APM:Rover
Canberra, Australia

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Andrew Tridgell's Blog

APM:Plane 3.0.0 released

Posted on April 7, 2014 at 5:42pm 53 Comments

The ardupilot development team is proud to announce the release of version 3.0.0 of APM:Plane. This is a major release with a lot of new features.

For each release I try to highlight the two or 3 key new features that…


A peek into the future of ardupilot

Posted on January 30, 2014 at 6:00pm 65 Comments

At the recent LCA'2014 conference in Perth I gave a couple of talks about research projects I'm working on with ardupilot. These show a couple of the things that we are working towards with APM.

The first is a talk on differential GPS which is part of a collaboration between Ben Nizette at ANU and…


APM:Plane 2.78 released

Posted on January 29, 2014 at 8:30pm 16 Comments

I've just released APM:Plane 2.78

This is a bug fix release for a number of important issues found in the 2.77 release. 

The changes in this release are

Fixed sensor start-up on the APM1…


Advances in airspeed handling

Posted on September 17, 2013 at 9:02pm 44 Comments

With the release of the 2.74 version of APM:Plane and the introduction of TECS, the ability of APM to…


Comment Wall (10 comments)

At 7:20pm on November 27, 2012,

Hi Andrew

It looks like my navigation gremlin isn't completely solved. I've posted an update with images and logs at

I wonder if you're able to see anything else obviously wrong?



At 8:12pm on December 19, 2012, Jamie Glover said…

Tridge, can I bother you to look over 5 log files to see if you can spot the crash and possibly what happened? I was flying my Skywalker with the exact same setup as always and have had many successful flights until yesterday. Two back to back and a totaled plane now. In FBWA it would go into a steady downward pitch. It was unresponsive to any of my input. I tried manual and RTL with no response. I had I think 5 logs on the APM after the flight and Ive looked through them, but Im not sure what Im looking at. The plane on the last crash stayed dangling in a tree for about 4 hours while I tried to get it down. Anyways, I would greatly appreciate your input. Email me if you wouldnt mind taking a look at the logs.

Thank you sir.


At 12:51pm on March 16, 2013,
Wiki Ninja
Gary McCray

Hi Andrew, Ive just finished putting in a section on how to flash your PX4FMU board with the latest developer ArduCopter PX4 code from your firmware object repository.

It's pretty ugly and includes quite a bit of stuff for setting up  development environment as well.

And sadly at the end after flashing the new code to the PX4FMU it still won't establish a MavLink connection with Mission Planner although I am pretty sure the board is properly flashed.

I am giving you the link to my Wiki debacle here:

I would greatly appreciate any feedback you could give.

I actually produced this primarily to get feedback from you as I did not want to waste any more of your time than necessary with incomplete back and forths.

If you can point me in the right direction(s) I would greatly appreciate it and will be happy to modify the Wiki page appropriately.

I figure that if we can get this simplest FMU only one to be "acceptable" the rest should fall into place fairly easily.

Thank You very much for your assistance with this.

Gary McCray (Please feel free to Email direct if you wish).

At 9:42am on April 22, 2013, Sid said…

Hi Andrew - 

I am new to ArduPlane development and having trouble getting it to build with Arduino.  

I would greatly appreciate any direction you can provide on what I am doing wrong.

This is what I have done:

I have downloaded Arduino 1.0.4, 1.0.3 and 1.5.2... I get the exact same set of errors whenever I tried to do a Verify / Compile of ArduPlane with any version of Arduino.  

There has to be something very basic here that I am missing.

I went here to get the latest Arduino development environment
There I downloaded Arduino 1.5.2
I extracted that to c:\Programming\Arduino
Then I was able to open Arduino and build their example programs without any errors.
I followed these instructions for getting set up for doing development:
No problems with building the Blink test example.
I set up the Arduino Sketchfolder here:  C:\Users\Sid\Documents\Arduino
I set this in Arduino's preferences
I then went to this page and followed the instructions for setting up ArduPlane development
I went here and downloaded the latest ArduPlane software - ArduPlane 2.7.1
I unzipped it to my desktop.
I then copied them to the Arduino Sketchbook folder as shown on Chris' web page (only using Sid instead of Chris).
Inline image 2
I then opened Arduino 1.5.2 and did a Verify / Compile and got the following error messages:
ArduPlane:239: error: new declaration 'uint8_t digitalRead(uint8_t)'
C:\Programming\arduino-1.5.2\hardware\arduino\avr\cores\arduino/Arduino.h:102: error: ambiguates old declaration 'int digitalRead(uint8_t)'
ArduPlane:1288: error: expected constructor, destructor, or type conversion before 'int'
ArduPlane.pde: In function 'int SKETCH_MAIN(int, char* const*)':
ArduPlane:1288: error: 'OK' was not declared in this scope
compat.pde: In function 'uint8_t digitalRead(uint8_t)':
compat:33: error: new declaration 'uint8_t digitalRead(uint8_t)'
C:\Programming\arduino-1.5.2\hardware\arduino\avr\cores\arduino/Arduino.h:102: error: ambiguates old declaration 'int digitalRead(uint8_t)'
I am at a loss as to what I am doing wrong here and I hate asking for help.  Any direction would be really appreciated.  I will be ecstatic when I am able to get ArduPlane to build and can start doing real development with it.
Thanks again.

At 5:39pm on April 22, 2013,
Andrew Tridgell

Hi Sid,

Have a look at under Tools, in the Arduino directory. That is the Arduino version you need.

Also see for more developer information.

Cheers, Tridge

At 8:07pm on May 24, 2013, Vishnu Rao said…
Hey Andrew! I'm flying an X8 with APM 2.5. I have quite struggled trying to tune the bird to the right PID settings. Lately I have been using the X5 Param file posted in the Common config website.
I noticed the X8 in your display picture, can you help me by sending me the parameter file you've been using?
My AUW is 4kgs. Any changes or suggestions to keep it safe and stable? I've taken care of the wings. Also when I was using the Arduplane 2.72, my plane would snake around while navigating. Is there anything I would've missed out?
Please help.
At 5:52pm on July 22, 2013, Philip said…
Hi Tridge
I sent you an email on your Samba email address with my contact details, will be up in Canberra tomorrow. Would be great to catch up if you are around.
At 10:28pm on September 15, 2013, MD said…

Hi Tridge,

Would it be feasible to code something to use the laser altimeter currently discussed on top content blog (link below). It's the first low cost and accurate one I've seen and could be used for both arducopter and arduplane, would be really good for autoland for both and avoidance, not to mention the what to do with it if put on a servo. Possible? If so, who would be best to ask to do this? Thanks.


At 11:28pm on November 21, 2013, Paul Classon said…

Dear Andrew, I recently got back into RC modelling after 50 years (64 now) there have been some significant advances in both radio and airframes since the old OS Pixie days and rubber escapements.  I bought a Bixler 1 now a 2 which I wanted to fit one of the Hobbyking Crius AIO FC's to. The Multiwii and megapirate AIO FC with a Atmega 2560 MCU.  Which firmware would you advise to upload, preferably something which will make the setup as much plug and play as possible. Are you aware of any periodic gatherings down here in Melbourne for like minded RC flyers?  I thank you in advance BR Paul.

At 12:11pm on December 21, 2013, Jamie Glover said…

Hey Tridge,

I went out earlier this week and flew a mission with the University's plane to test out the GeoSearch program. After completing the mission, I put it into FBWA to bring it down for a landing. about 75 ft off the ground, it went into an straight down nose dive. This is the second time its happened, but this one was unrecoverable. Needless to say the crash totaled the plane. I was wondering if you could look through the logs to see if it is possibly the same issue as the bug that was fixed in 2.76.  I was running 2.76 firmware. I looked through the logs and you can see where the APM received the command to pull out of the dive, but the servos never responded to the command.  Anyways, I was thinking it is either the bug or an interference problem from a cell phone tower about a mile away. My professor wants to make sure either way before we put more money into the project. Ive attached the log files and would greatly appreciate any feedback.



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