Jack Crossfire's Blog (184)

Adventures in tablet flying

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Added by Jack Crossfire on January 1, 2013 at 7:50pm — 8 Comments

Marcy 1 with the lights on





Finally got her to fly with the lights on. There are a lot of problems with lightbulbs reflecting on reflective surfaces. These problems never happened with IR, but IR should be no different.



Detecting the XYZ of a spinning object with 1 camera in high shutter speed mode is really hard. It would be easier with 2 cameras.



There is a new…

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Added by Jack Crossfire on December 20, 2012 at 1:00am — 6 Comments

Raspberry Pi flies Blade MCX

Just press start & it flies itself.  A self contained autopilot was the goal. 

There were a number of options. Wifi ended up having too many dropouts to be used in any feedback loop, but would have to be used when communicating with a tablet. …

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Added by Jack Crossfire on December 7, 2012 at 12:30am — 2 Comments

Automating the Blade MCX



The Blade MCX is a favorite of indoor micro UAV autopilot designers, even in the age of micro quad copters. The time had come to automate one.…

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Added by Jack Crossfire on December 2, 2012 at 1:30am — 4 Comments

Distance measurement with Rigol



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Added by Jack Crossfire on November 12, 2012 at 3:00am — 1 Comment

Vision systems, then & now





After a rough start in Summer 2011, pan/tilt vision systems have emerged as the ultimate solution for indoor navigation.  No surprise, after the success of the Kinect.  This was the most advanced,…

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Added by Jack Crossfire on October 7, 2012 at 9:00pm — 4 Comments

Target audiences

It may be that the blog reaches more people on RCGroups than DIY Drones.  The audience of both tends to be the same RC pilots, not electronics designers, but RC Groups tends to be frequented by more electronics designers while DIY Drones is frequented by more absolute beginners. 

Because of the lack of jobs, the Marcy class…

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Added by Jack Crossfire on July 29, 2012 at 1:30am — 21 Comments

Throwing more feeds & speeds at a problem

 



So sonar was officially back again for another swing at a home run, with a lot more clockcycles.

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Added by Jack Crossfire on July 15, 2012 at 11:30pm — 4 Comments

Sonar revival



 Further progress requires starting to desolder the Heroine 2200 boards.  That was the 1st robot.  The ages from 25-30 were spent purely devoted to that 1 thing, while everyone else was clubbing & getting…

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Added by Jack Crossfire on July 6, 2012 at 4:15pm — 2 Comments

Evolution of a position tracker







So the red/blue marker failed when flying…
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Added by Jack Crossfire on June 29, 2012 at 8:56pm — 1 Comment

SPARKFUN NOTES

Haven't paid attention to the $parkfun autonomous vehicle competition, manely because the announcements come up so far ahead of time, it makes you feel aging faster than you really are.  Was thinking about how a dead…
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Added by Jack Crossfire on June 25, 2012 at 3:00pm — 4 Comments

Downward facing camera busted

 

 

 

So the 1st flight with some vision hits happened.

 

 



Blue becomes visible 1st.…

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Added by Jack Crossfire on June 22, 2012 at 2:30pm — 8 Comments

Blob vision

 

It does work on the test stand, for the most part. There's a lot of lag. There's a dead area directly on the axis of rotation. The range of working ambient light is very narrow. The mane limitation is not knowing where the axis of rotation is in the frame.…

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Added by Jack Crossfire on June 15, 2012 at 9:42pm — 2 Comments

The future is pink





 Marcy 2 finally does the 1st step in flight: stabilized rotation on the ground, using the onboard camera & blob detection. Making the RPM slow enough for maximum efficiency makes it too unstable to take off without active control.

It took only 1 week for the super simple ESC…

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Added by Jack Crossfire on June 8, 2012 at 11:56am — 4 Comments

Home made ESC ideas



Bodge work continues, in the pursuit of supplying the required current in the smallest possible space.  The LM1117 was the only thing available locally.  It makes 3.25V at 800mA with a…

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Added by Jack Crossfire on June 1, 2012 at 4:00pm — 11 Comments

Downward facing camera

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Added by Jack Crossfire on May 25, 2012 at 5:00pm — 2 Comments

1st spinning camera footage



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Added by Jack Crossfire on May 18, 2012 at 2:46pm — 3 Comments

I2C woes





Stepped the wireless down to 11megabit & the range definitely increased.  It uses a lot more power because the transmitter is on longer, but the penetration is much better. 



Found another 64k of RAM on the STM32F4.  It's the…

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Added by Jack Crossfire on May 12, 2012 at 10:30pm — 2 Comments

Kickstarter thoughts

If you don't have dreams of launching a UAV project on kickstarter, making zillions of dollars, & quitting your unemployment compensation, you're crazy.  So here's a quick graph of kickstarter funding for "currently funding" LA…

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Added by Jack Crossfire on May 6, 2012 at 9:54pm — 7 Comments

Wifi cam complete

Various modes of Marcy 2's fully functioning wifi camera are shown. A 168Mhz 128k RAM chip compresses JPEG & streams on 802.11g. As the frame size increases & color is enabled, the framerate goes down. Body movement around the antenna makes it drop packets. It still compresses a lot faster…

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Added by Jack Crossfire on May 3, 2012 at 8:13pm — 10 Comments

Groups

Season Two of the Trust Time Trial (T3) Contest 
A list of all T3 contests is here. The current round, the Vertical Horizontal one, is here

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