"Hi DiY' users,
I have bought 2 xbee 868 Mhz and i'm trying to connect with my arducopter. I'm trying to connect to APM PLANNER in 57600 bauds. I have the connection but after 50 % of loading param the connection ending ...
Can…"
Tom's Discussions
A complete list of quadrotor electronic platforms
Started Jan 9 0 Replies 0 Likes
I've been searching for a list of available hardware I could choose from when building a quadrotor (or hexa / octo / ...). Has anyone passed around a list like that? I'm interested in complete…Continue
Tags: electronics, hardware, quadrotor
Where to buy aluminium profiles like the ones for ArduCopter frame
Started this discussion. Last reply by DaveyWaveyBunsenBurner Jun 28, 2011. 6 Replies 0 Likes
Hi,I already spent many hours searching through the web, so I decided to ask. Does anyone know where (apart from jDrones shop) can I buy 12x12mm 0,5mm thick alu profiles?Regards,TomContinue
Tags: frame
ROS drivers for ArduCopter, anyone?
Started this discussion. Last reply by Al W Feb 15. 1 Reply 0 Likes
Hi,I'd like to use ArduCopter with ROS, so I wanted to ask you guys if anyone else would be insterested as well. I've already successfully tested ROS on a…Continue
Tags: ROS, ArduCopter
ArduCopter KIT ordering (from EU)
Started this discussion. Last reply by Mark Feb 15, 2011. 8 Replies 0 Likes
Hope someone knows the answers:Does DIY Drones Store ship to Europe, or should I rather choose jdrones.com? They used to have ArduCopter parts at lipoly.de, but this seems not to be the case anymore.…Continue
Tom's Page
Latest Activity
Al W replied to Tom's discussion ROS drivers for ArduCopter, anyone?"Hi, I realize this post was a year ago, but have you made any progress? I am currently in the same situation and could use some pointer. Could you PM me if possible?
Thanks!"
Tom replied to Just Robotics's discussion Kalman Filter vs DCM"Ad 2. Yes and no. Yes, the sensor measurements obtained from cheap gyroscopes and accelerometers are quite noisy. Generally, in case of very slow rotating and non-accelerating objects, 3-axis accelerometers alone would suffice to obtain angular…"
Tom replied to Just Robotics's discussion Kalman Filter vs DCM"I think, developing a UAV simulation in, e.g., Matlab / Simulink, from scratch might be a better place to start, if you really wan't to understand how things work. I see the learning process the following way:
First thing to understand when…"
Tom posted a discussionA complete list of quadrotor electronic platforms
I've been searching for a list of available hardware I could choose from when building a quadrotor (or hexa / octo / ...). Has anyone passed around a list like that? I'm interested in complete hardware solutions only (software is irrelevant). I'm also only interested in low-cost, so no professional army stuff please (preferably < 500$).For start, I'll list the solutions I know of:ArduPilot Mega 1.0 + IMU, price around 250$ArduPilot Mega 2.0 (purple), 200$…See More
Tom replied to Ethan Ferrell's discussion ArduCopter Carrier Board Layout"Hi Ethan, what material did you choose to cut those for yourself? I've been planning to have them cut for me but don't know what is it best to cut them of (apart from carbon fiber, which is expensive)."
Tom replied to Aurelio R. Ramos's discussion Multi rotors, the altitude yoyo effect, and how to deal with it"I don't know what possible error sources for sonars are and am not convinced they are mostly of electrical nature. I also would leave the sonar filtering discussion for later (and in another topic). Here let's focus on altitude hold."
Tom replied to Aurelio R. Ramos's discussion Multi rotors, the altitude yoyo effect, and how to deal with it"Regarding sonar sampling: I've forgotten to mention one more filtering step I'm doing, ie. comparing each sample to the previous one and allowing only for 10% change each step. Due to the oversampling this is a safe mechanism and…"
Tom replied to Aurelio R. Ramos's discussion Multi rotors, the altitude yoyo effect, and how to deal with it"Thanks Robert. I generally fully agree. I'm also for introducing an internal loop for rate of climb control and an external loop for altitude control - so that's what I'd like to implement eventually.
Here is my strategy for sonar…"
Tom replied to Aurelio R. Ramos's discussion Multi rotors, the altitude yoyo effect, and how to deal with it"Oops, correction: I meant subtract, not substitute gravity, of course."
Tom replied to Aurelio R. Ramos's discussion Multi rotors, the altitude yoyo effect, and how to deal with it"Altitude hold is a position-control loop, ie. the quantity controlled is vertical position. So the error signal driving the controller must be vertical position setpoint error (which right away serves as proportional input for the controller). Then…"
Tom replied to Aurelio R. Ramos's discussion Multi rotors, the altitude yoyo effect, and how to deal with it"I'm still working on a clean solution, I don't know about Aurelio's work's progress.
One thing I did a little better (I think) is I implemented a second order Butterworth high-pass filter instead of the simple first order filter…"
Tom replied to Aurelio R. Ramos's discussion Multi rotors, the altitude yoyo effect, and how to deal with it"All I did since now was trying to understand better what is one really measuring while "leaking" an integral. Naturally, the leaking process is more or less equal to high-pass filtering, which is more or less the opposite to integrating...…"
Tom replied to Aurelio R. Ramos's discussion Multi rotors, the altitude yoyo effect, and how to deal with it"I made another one analysis, trying to avoid anything from causing sonar reading distortions (like keeping my sleeves out of the way) and, more importantly, adding sonar dirty-derivative to show the positive phase shift induced by high-pass…"
Tom replied to Aurelio R. Ramos's discussion Multi rotors, the altitude yoyo effect, and how to deal with it"I researched the leaky-integrator a little further and this is what I found. I measured accelerometer velocity estimate for 3 different leak rates (0,1; 0,01; 0,001) and recorded them against sonar provided altitudes. Acc vertical velocities are…"
Tom replied to Aurelio R. Ramos's discussion Multi rotors, the altitude yoyo effect, and how to deal with it"Nice work there Aurelio. I was also starting to work on a similar issue, namely automatic take-off and landing for an indoor setup quadrocopter with sonar + accelerometer. I like the idea of a leaky-integrator for short term velocity estimation.
I…"
Profile Information
- About Me:
- Beginning quadrotor enthusiast
- Tell us a bit about your UAV interest
- vision based indoor quadrotor attitude stabilisation
Comment Wall (2 comments)
- At 11:23am on November 30, 2010,
jaron said… - Tom, it'll be possible to simulate quadrotors with UAVsim (UAV Playground) but I haven't planned it. Nobody has done it so far and it'll need some effort to do so.
- At 11:09am on July 7, 2011,
Developerjasonshort said… You can PM chris to get added. Hopefully we'll find a solution soon to make the list public. It's mostly a technical one.
Jason
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Season Two of the Trust Time Trial (T3) Contest has now begun. The third round was a reliablilty/aerial photography round for both planes and copters, which is now closed. Stay tuned for the next round, beginning soon.A list of all T3 contests is here.
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