Matt Fisher
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  • Toronto, Ontario
  • Canada

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In Need of Some XBee Pro 900 Stats

Started this discussion. Last reply by Franco Marinelli Jun 22, 2011. 3 Replies


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Matt Fisher's Blog

Enlarging the WildHawk Fuselage

Posted on August 15, 2010 at 5:46pm 0 Comments

I use my WildHawk for testing UAV code as well as just for fun flights when I am out and about (where I don't mind a crash here and there). I am now working on finding a battery system that will give me huge flight time and I was in need of expanding the fuselage to hold these new batteries as I test. This is a simple mod with function over design in mind - but I figured I would post this since the WildHawk is a popular platform and this is a easy modification. The added weight ended up being… Continue

Little X-Plane Pushes the Bottom Edge of the Envelope

Posted on October 30, 2009 at 1:06pm 7 Comments

Flight test programs at Edwards Air Force Base and NASA’s Dryden Flight Research Center usually are off-limits to outsiders, but we got a peek at one of its coolest programs, the X-48B, when the Air Force recently threw open the gates for an open house.


A New and Interesting Microcontroller

Posted on April 2, 2009 at 11:30am 14 Comments

I think I may have to get one of these. It can run a 32bit OS off microSD, 1000MHz CPU with 256MB DRAM and do it all off of 2 watts!

Is anyone as keen about getting there hands on this as I am!? A Linux distro for UAV's anyone?

Article on Make Blog…


Reading Saitek Pro Flight Yoke System Data for UAV Usage

Posted on March 31, 2009 at 4:00pm 13 Comments

Here is the (Python) code I used for getting my Saitek Pro Flight Yoke ( data from the device into something usable. Python has a fantasic pygame library which reads joystick data. This is just a simple script that is short and sweet. This code reads all the motion axis (ie. the yoke, hat and throttles, ) and all of the buttons. Feel free to play around with it. I really dont want to use a RC transmitter for my UAV as I can so so much more with this… Continue

Ground Target Tracking with Road Map Support

Posted on March 31, 2009 at 12:03pm 0 Comments

I found this paper titled "Ground Target Tracking with Road Map Support" written by Daniel Streller ( (5 page PDF, 161KB)

Its somewhat of a complicated read but very interesting as well.

The UAV I am planning to build will have alot of onboard memory which I will use to store road data from a automobile GPA system. This data will be used to properly find waypoint by… Continue

Comment Wall (8 comments)

At 2:10pm on April 2, 2009, Lorentz said…
Hi Matt. About the RQ 7 shadow replica (actually inspired by AeroSonde): thank you for the "amazing". The fuselage is built with fiberglass made out of a mould, the wings are of styrofoam covered with balsa and Oracover film. Tail booms are actually two graphite arrows. Ruddervators are built with solid balsa covered with Oracover. Propulsion is obtained with an Axi 2820 brushless+ 80 Amps controller and 4S1P LiFePO4 Batteries. It's still a work in progress, anyway, wings are undergoing major modifications at the moment.
At 3:40am on April 3, 2009, Lorentz said…
the mould is the result of almost one year of work. It was (and still is) my first experiment with moulds, so it suffers from a number of defects, both by design and by construction. With hindsight I wouldn't do it again: a mould makes sense only if one's going to start a series production. Regarding flying behavior: I must admit I flew it only twice (too scared of destroying two years of work), anyway it has a low stall speed, it pulls up a little when increasing throttle and tail surfaces have poor authority when used as rudder. On the last landing the struts that join booms to the wings broke, so now it's waiting some repair.
At 1:12pm on October 29, 2009,
Jason Short
I'm doing one last test build later tonight, then I'll post it with my AP source. It would be relatively trivial to make it work with the Ardupilot SW.
At 7:35am on April 18, 2011, Bryce Fraser said…
hi matt

how many batteries do you have in your setup ?
what is your flight time ?
max all up weight ?

im busy with a setup on my mq 9 that is being shipped over at the moment
ill have a complete ardu pilot, dosd, xbee 868 setup .
i need atleast 1 hour flight time.

can you help with some advice please .

thank you
At 7:56am on April 18, 2011, Bryce Fraser said…
thanks for the reply
what is your mah rating on the 4 cell pack
i intend doing it all on 3 cell system i have a scorpion 40-15 1090kv with 70Amp speedo
i wanted to run 2 * 3 cell 6000mah in parallel for power system
1 * 3 cell 2650mah for dosd and video 1watt 2.4g
1 * 2 cell 1800mah for radio, and ardu pilot

not sure what my MMAUW will be for take off

can share some input ?
At 11:16am on April 19, 2011, Bryce Fraser said…

hey matt are you doing auto landings and takeoffs with yours what setup are you running

are you able to help me with my setup please.

and maybe share your code.


thank you 

At 10:13am on August 8, 2011, estebanflyer said…

Hey Matt, I was wondering if you were in Toronto these days, I'm trying really hard to make my quad fly with no success, everything works perfectly: GPS lock, xbee, radio modes, battery cells measurement, ESC calibration, compass, sonar.... I'm stuck at PID's, the copter takes off in a very sluggish way, no matter how I tweak the PID's I always end in a crash, so I thought I might as well pay someone for their time and save money on propellers. (Also save time in balancing them)

Please let me know if you are available. I am at Dufferin and Bloor, but if you want I can take all my gear to you. My phone number is 905 616 8482 (not long distance; Mississauga). As I said, I'm willing to pay for your time. All I want is to have the quad flying.

Please help me out!


Esteban Díaz


At 11:46am on December 4, 2011, prof.avi.levy said…

Dear Matt,

I am new in the UAV area. I am building the MQ-9 Reaper which I just got from hobby king. I also ordered the full Ardupilot Mega Electronic Set.

I found the link you made for your pictures and thanking you a lot for that. I do have some questions.

1)      Did you finish your setup for that model?

2)      Could you please let me know where you placed the batteries (4 cell for the engine, and 2 3cells for video and autopilot.)  in the fuselage, since it looks very tight for me?

3)       Could you please share with me your Ardupilot Mega setup.

Many thanks


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