Matthew Coleman
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Matthew Coleman's Discussions

Where is the PX4?

Started this discussion. Last reply by Matthew Coleman Oct 11, 2013. 8 Replies

Now 3DR has cornered the manufacturing market for the majority of open source autopilots, I was wondering when it get its act together and actually build some.  Might be a smart move to build stuff…Continue

Tags: sucks, 3DR

Feature Request: Clear indication of actual airframe selected

Started this discussion. Last reply by Matthew Coleman Jul 22, 2013. 2 Replies

Just spent a frustrating half day of novelty crashes before finding that the hexa firmware was loaded instead of quad.  Please add a clear indicator showing which frame firmware is loaded.CLI debug…Continue

Building mavlink in scilab code block

Started this discussion. Last reply by Venkat Gidda Jan 23, 2013. 4 Replies

I am attempting to build the mavlink library in a scilab block to run SITL.When scilab compiles, it only finds the mavlnk headers if I name the absolute directory.  Changing the working directory…Continue

Vario for glider pilots using mavlink/mavproxy telemetry

Started Jun 18, 2012 0 Replies

If anyone is interested in adding a vario (audio beeps depending on rise/fall rate) for mavlink connected autopilot, there is a project here:…Continue

 

Matthew Coleman's Page

Latest Activity

Matthew Coleman replied to turdsurfer's discussion Tricopter wagging tail issue (firmware 2.* through 3.1.2)
"TS, I modified my tri putting the blade closer to the hinge.  At the same time I mounted the ESC on the bottom side of the hinge to give it a counterbalance.  Having the ESC mass at the tips gives a bit more rotational momentum so that…"
Mar 21
Matthew Coleman commented on Nick Arsov's blog post AUAV-X1 , a new vision of the PX4 autopilot
"@turdsurfer, There are switch mode supplies all over your system including SBECs and ESCs.  Most of those are handling far more energy and radiating more than the relatively low current buck-boost will.  2.2-2.4MHz is a popular area to put…"
Feb 12
Matthew Coleman commented on Nick Arsov's blog post AUAV-X1 , a new vision of the PX4 autopilot
Feb 12
Matthew Coleman commented on Nick Arsov's blog post AUAV-X1 , a new vision of the PX4 autopilot
"Congrats to Nick for squeezing all that into 30*43mm.  Good to see some efficient engineering. Yes the SMPS generates some noise but it is not the end of the world.  There is a tradeoff between having a remote power module and a remote…"
Feb 10
Matthew Coleman commented on Hamish's blog post Heres a video bound to make you cry
"random thought.  Should the NSA employ trappy?  He has the skills and loves his work.  They have the need to spy.  Everyone wins...."
Jan 16
Matthew Coleman commented on Chris Anderson's blog post A little bit of history
"@Hein,  A quote from 3DR marketing wrt. Pixhawk  "it's the same size as APM (actually slightly shorter)" So your wrong.  It is not getting larger, you are just looking at it from the wrong angle"
Dec 22, 2013
Matthew Coleman commented on Sue Rosenstock's blog post Pixhawk is Ready for Takeoff
"@Lorenz,  I do enjoy the PX4users forum.  Very much an engineering group.  Pity I have not been able to contribute much but hopefully that will change once I make the right hardware. "
Dec 18, 2013
Matthew Coleman commented on Sue Rosenstock's blog post Pixhawk is Ready for Takeoff
"Hi Lorenz,  Different groups want to innovate in different directions for different reasons.  Some groups are busy engineering the very best value square pegs possible but these are never going to properly fit the round hole problem. I…"
Dec 18, 2013
Matthew Coleman commented on Sue Rosenstock's blog post Pixhawk is Ready for Takeoff
"So if there was a lower cost version of pixhawk for entry level users that could be expanded into a dual redundant system that also solves the problem of sensor placement, that would be interesting to people?? It's almost as if there is a…"
Dec 18, 2013
Matthew Coleman commented on Sue Rosenstock's blog post Pixhawk is Ready for Takeoff
"@Crashpilot1000 I am very sorry to say that you don't fit the 3DR customer model.  How dare you dream of cheaper alternatives that make this hobby accessible.  You are a heretic and shall be cast out into the darkness, never to be…"
Dec 17, 2013
Matthew Coleman commented on Sue Rosenstock's blog post Pixhawk is Ready for Takeoff
"@Crashpilot.  Consider the extra features that are added to pixhawk that increase the value.  Much of this $ value in features that help to make it easy to use, flexible and somewhat idiot proof.  My estimate is an additional 50% was…"
Dec 16, 2013
Matthew Coleman commented on Patrick Egan's blog post How Did The U.S. Lag So Far Behind On UAS Integration
"@Gary,  In Japan the road death rate is a very low 5ppl/yr per 100k.  That is nearly one person per year for 14k operators. lies, damn lies and statistics...."
Dec 6, 2013
Matthew Coleman replied to Eric Kut's discussion airspeed sensor vs rain/mist/cloud
"Eric, You could add a porous ceramic filter to the inside of the tubing to keep out the water.  The trouble is that they do keep out the air to some extent.  The result is a damped response. Regards Matt"
Nov 21, 2013
Matthew Coleman replied to Giuseppe Galullo's discussion glider UAV to 18-hour flight
"Giuseppe, I am flying a Valenta Thermik XXXL.  It is the full carbon wing and kevlar fuselage version.  Total flying weight is 6.5kg.  Full power takes ~2.4kW from the 6s battery so there is no problem hand launching.  Airframe…"
Nov 9, 2013
Matthew Coleman commented on Ian Lyons's blog post Modular phone concept for flight controllers
"Do you really want all of your sensors in one modular package?"
Oct 29, 2013
Matthew Coleman commented on Joshua Johnson's blog post How can DiyDrones surpass RcGroups!?
"JJ, Morli,  you either want to be the biggest and invite everyone or you wish to stay focused on one brand.  The name of the site and it's tagline are slightly conflicting with its behaviour.  Either way, make your mind up and…"
Oct 25, 2013

Profile Information

About Me:
Electronics and software engineer
Please tell us a bit about your UAV interest
Large autonomous gliders
Hometown:
Somewhere in England

Matthew Coleman's Blog

Anything you want mixing

Posted on May 16, 2013 at 3:10pm 5 Comments

I would like to introduce the community to a mixer method used to fly complex aircraft in manual, fly-by-wire and autonomous modes.

The main challenges of mixing are:

  • Flexibility to do anything you want.
  • Easy to use and prevents…
Continue

Fly-by-polar

Posted on April 28, 2013 at 10:18am 65 Comments

Airspeed control is critical when flying sailplanes.  You want to fly close to stall but never beyond it, since that will normally cause a tip stall and great loss of energy.  How do you teach an autopilot to fly on the edge of stall?…



Continue

A challenge - An autopilot to fit in this

Posted on March 5, 2011 at 2:53am 31 Comments

 

 

This is the Vladimir models Graphite 2e.  It is a fairly typical skinny, lightweight, efficient fully moulded motor glider.  Despite its 3.1m span there is not much space for anything.

 

THE CHALLENGE - HOW TO FIT AN AUTOPILOT AND TELEMETRY SYSTEM IN A GRAPHITE…

Continue

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