Diarmuid Wrenne
Diarmuid Wrenne
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  • mohammed saif
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Diarmuid Wrenne's Discussions

MIT Lidar

Started this discussion. Last reply by Chad Snoke Apr 28, 2010. 2 Replies

Off the shelf helicopter hack

Started Feb 11, 2010 0 Replies

lookdown video analysis code

Started this discussion. Last reply by Diarmuid Wrenne Jan 13, 2010. 19 Replies

 

Diarmuid Wrenne's Page

Latest Activity

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Jeffrey Torella replied to Diarmuid Wrenne's discussion 'Xbee for full remote control'
yeah i got you completly now. thats was one thing i was considering also to completly cut out original rc transmitter?reciever . and just have a set of paired xbees or like devices to do complete control from my pc if needed. but as you mentioned…
Mar 26, 2010
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Diarmuid Wrenne replied to Daniel Nugent's discussion 'Object tracking'
I used aforge today to do some simple motion capture at my desk. It does a great job of finding blobs. Tracking then is a bit of a black art in that if you have the centroid of a blob in frame 1 and then you have a set of blobs in frame 2, you need…
Mar 25, 2010
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Diarmuid Wrenne replied to Daniel Nugent's discussion 'Object tracking'
Hi Daniel, Try http://code.google.com/p/aforge/ . c# and microsoft friendly. Good for prototyping and for developing algorithms and allows for a more interactive development process. Look at PIL for python. Does not do what aforge does (hough…
Mar 25, 2010
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Diarmuid Wrenne left a comment for mohammed saif
Thanks. It's great to link up across such a distance.
Mar 25, 2010
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Diarmuid Wrenne replied to Daniel Nugent's discussion 'Object tracking'
Try OpenCV ˇhttp://opencv.willowgarage.com/wiki/ AVRcam Look for optical flow, blob tracking, that sort of thing. Automatic tracking an object the size of a car at distance is non trivial unless you tell it it's a car first. Or else use…
Mar 25, 2010
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Diarmuid Wrenne replied to mohammed saif's discussion 'Razor 9DOF IMU AHRS , used software'
Hi, While I appreciate that Mathlab is a great productivity tool for quick prototyping, I think an Open Source GS is the way forward. The way I am designing it is that there will be a central web server data bus that will accept data from multiple…
Mar 25, 2010
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Diarmuid Wrenne replied to mohammed saif's discussion 'Razor 9DOF IMU AHRS , used software'
Hi, I am doing the same. Currently I'm working on the data bus and then I will do the graphics. There are a few projects on google code that do something similar as well as Paparazzi. Have you got as far as parsing the data stream and seeing…
Mar 24, 2010
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Ravi Gaddipati replied to Diarmuid Wrenne's discussion 'MIT Lidar'
I am currently working on stereopsis using two cameras: http://rp181.fortscribe.com/?cat=108
Mar 22, 2010
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Diarmuid Wrenne replied to Ravi Gaddipati's discussion 'Planned QUADROcopter UAV, please look over my setup before I buy'
You could look at a tethered solution in the short term. Use a car battery or similar and 7 or 8 meters of reasonably large core power lines . At 12 volt and high amps you are going to lose allot of power to line losses but I bet cable is cheaper…
Mar 21, 2010
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MIT Lidar

Hi,(Scrap this, as after looking at the SLAM page, it looks like they used the Hokuyo scanner . It generates the same sort of image as the images in the videos is you have a spare 350 grames available and $5500 then indoor lidar is for you. That said I wonder how feasible a pure camera based point clound generator would be.)I am listening to the podcasts and just came across the interview with Bill. I was interested in the MIT GPS denied indoor drone and the guys' comments on the 'LIDAR' . They…See More
Discussion posted by Diarmuid Wrenne Mar 20, 2010
1 Comment
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Diarmuid Wrenne replied to Diarmuid Wrenne's discussion 'Xbee for full remote control'
Hi Jeffery, Generally I think some sort of graceful recovery from a comms failure (either permanent of intermittent) should be built into every UAV flightplan. Either a return to base and loiter or in the case of 'copter craft , a hover and…
Mar 18, 2010
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James F. replied to Diarmuid Wrenne's discussion 'Xbee for full remote control'
How do you plan on getting video back on a single line? XBee's can't handle that kind of bandwidth...
Mar 17, 2010
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Dan Arbeider replied to Diarmuid Wrenne's discussion 'Xbee for full remote control'
Joe, do you have any more info on your XBEE serial to pololu servo controller setup? I'm trying to do something very similar. Do you have a null modem adapter between the two?
Mar 17, 2010
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Diarmuid Wrenne replied to Jonas Arvidsson's discussion 'Best way to determine the speed relative to the ground?'
While the absolute error for GPS chips can be quite big, their drift in the short term (minutes) is very small. So for distances relative to the start point, they are pretty good. You need to be outdoors and have very good sat readings. That said,…
Mar 17, 2010
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Diarmuid Wrenne replied to Gerald Derec's discussion 'Satellite internet to control drones?'
I used a wifire from hfield which if you take it apart is a usb wifi gadget with a yagi (I think) antenna etched onto the PCB. From the hill near my town I was able to pick up loads of access points and browse the web on my one at home from 500…
Mar 16, 2010
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Diarmuid Wrenne replied to Kraig Krumm's discussion 'Rocket application'
You must have pretty amazing aerodynamics to be sure that a 36' rocket flies straight. Is this done by imparting a rotation via the aft vanes. That way I suppose leaning a particular direction would even out. 5 degrees should be easily…
Mar 16, 2010

Profile Information

About Me:
Builing embeded systems and interested in in loop simulations
Tell us a bit about your UAV interest
www.bluekulu.com
Hometown:
Cork, Ireland

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