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DJI Heli Autopilot System(Naza-H/WooKong-H/Ace One) DJI Heli Autopilot System(Naza-H/WooKong-H/Ace One) Factory Support Forum |
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12-23-2012, 04:13 AM | #261 (permalink) | |
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Quote:
Adding another block may cause an issue alright, but I'm sure time will tell. |
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12-23-2012, 05:21 AM | #262 (permalink) |
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Join Date: Feb 2012
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I just came across this. Check out the wires coming out of the gps.
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12-23-2012, 05:45 AM | #263 (permalink) |
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Join Date: Oct 2009
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The data line from the GPS does emit interference and itself is sensitive to interference.
On my Eagletree GPS unit, the wires are straight and unshielded but with a torroid at the GPS end. Without the torroid it still works but takes much longer to get a lock. On my RVOSD GPS they use no torroid but do use a shielded cable (not twisted pairs, just braided an outer braided shield. I now use my own shielded wires with torroid at the GPS end. Long story short, replacing the wire will be no problem. If you want to make it a removable connection then just shorten the stock wire (cut and resolder inside the gps unit would be best) and use one of the extension wires that came with the Naza.
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12-23-2012, 07:09 AM | #264 (permalink) |
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So some manufacturers use different cables etc on the GPS, shelided and not sheilded, twisted not twisted. Interesting. I think I would prefer your setup with high quality sheilded wire with toroid.
Thanks for the info. |
12-23-2012, 09:03 AM | #265 (permalink) | ||
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Join Date: Nov 2010
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Quote:
No idea what DJI uses. Quote:
But it sounds like you're trying to reinvent the wheel. What you want is already available. There are a number of open source flight controllers which can fly helis. Arducopter, Open Pilot, I think maybe even Multi-Wii can? Trust me, you don't want to start from scratch on this for no reason. Now, there's an issue with the RPi in this application. Biggest one is it's not a dedicated flight controller. It has a bunch of stuff you don't need (graphics driver), and then it would also need something to interface to the servos. A computer CPU cannot drive servo signals directly, nor read Rx signals. Even the software is hard, because trying to get an operating system to drive I/O with the rock-solid deterministic timing is tricky. The whole thing gets very messy. You really need a micro-controller to do this. Which takes us back to the various open source systems available already. Currenty Arducopter is running on a simple 8-bit Atmel processor. Pretty slow, but it gets the job done. Open Pilot is using an STM32 ARM processor, I believe. Much faster, but it is NOT the same as a RPi processor. The RPi has a Computer class processor, the STM32 is a microcontroller, which means it is designed to drive I/O directly. Arducopter has a 32 bit processor in the works. And STM32F4 with Floating Point Unit. It'll be much faster. Also, Roberto Navoni has his VRBrain system which is running Arducopter on STM32 already. But, none of these 32bit processors are really suitable for advanced stuff, such as vision systems, etc. Roberto has created the VRNeuron, which is basically a stripped down RPi (no graphics, etc) which bolts onto a VRBrain. So the Brain does the flight control, and the Neuron will do high-level stuff, and feed flight controls down to the Brain.
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12-23-2012, 10:14 AM | #266 (permalink) |
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Join Date: Feb 2011
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Some good news to pass along!
Well, after a little investigative work (translated: I opened my failed IMU to look for a possible reason as to why one of the accelerometers was stuck at -16, causing a "Other ERR[25]") I discovered a short on the board where the ribbon cable from the epoxy encased accelerometer is plugged into the board. I very carefully dislodged the foreign material between the pins of the socket, cleaned up the work with a dab of alcohol on a q-tip, and a short blast of canned air. I hooked up the IMU to the BEC and PC and applied power, thinking that not much was going to change. Well, was I ever wrong! Voila! The IMU initialized properly, and all accelerometers responded properly to +/- 1g in all axises! So now, I'm just out receiving a GPS unit, (and the parts to my Trex 500e to repair the boom strike). I have done some bench testing, and then IMU seems to be booting, programming, and responding normally with no apparent side effects! Perhaps the crash I had on the ground was a blessing in disguise... Had the short occurred while airborne, the heli would have been a total loss. One thing does kind of concern me with the internal construction of the IMU though. The entire accelerometer sensor consists of an epoxy encased sensor in a small metal cube. The cube is suspended by foam "dots" about 1/8" thick or so, and there is also a bit more foam on the top and bottom of the cube as well. I had a Kodak 35mm KR-5 camera that had been in storage for a few years, and when I opened it up to clean it to prep it for some black and white photography, I noticed that all the foam seals had disintegrated over the years. It makes me think that this might be a problem over the years with the Naza-H as well. I guess only time will tell... For now, I'm going to post the video I made just before the crash... I'm still working on some vibration issues with the camera. Please enjoy! [ame]http://www.youtube.com/watch?v=NOXPe9iE7IE[/ame] |
12-23-2012, 07:21 PM | #267 (permalink) | |
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Quote:
Glad to hear you seem to be on your way to sorting things out. Looks like the "physical layer" is the culprit once again. Do you have any idea if the short happened before or after your crash?
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MQX Quad,Align 550E/NazaH/GPS,Align450 Pro/CPII, Flame Wheel F450 Quad NazaM/GPS/GoPro3, Blade 350 QX/ GoPro3 Never lend money. It causes amnesia. |
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12-23-2012, 07:54 PM | #268 (permalink) |
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If you have the problem that NexxuSix had I would not take the Naza apart. It could void your ability to get a warranty replacement. Just an FYI.
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12-23-2012, 08:09 PM | #269 (permalink) | |
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Join Date: Feb 2011
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There is however a detailed analysis and tear down of the Naza here: http://www.rcgroups.com/forums/showthread.php?t=1676150 And this is exactly what mine looks like as well. (Look about half way down the page in that thread). Note the very fine pins of the ribbon cable socket on the IMU board... This is what got shorted out, causing the error... It maybe just a one time quality problem, and I just happen to be the lucky individual who got the IMU with a short in the waiting... I can only hope for the rest of you in this forum, that you too don't have any quality issues to suffer through with as well. I'm pretty stoked to have the system up and going. Parts will be in tomorrow, and if all goes well, I'll be flying (less GPS for the time being). At least, I will be able to test out the IMU in Alti mode, and upgrade to the GPS when it comes in. |
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12-23-2012, 08:18 PM | #270 (permalink) |
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"It maybe just a one time quality problem, and I just happen to be the lucky individual who got the IMU with a short in the waiting."
You are right, you may be the exception. Show some picks if you can.
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AMA #844172 DJI S1000 Lightbridge Zen for 5D, S900 LB Zen for BMPCC, DJI Phantom 2 Vision +, P2Z2 with Data Link, P2Z3 with LB DJI Forum Support |
12-23-2012, 08:34 PM | #271 (permalink) | ||
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Quote:
Quote:
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12-24-2012, 05:30 PM | #272 (permalink) |
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Join Date: Feb 2011
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Just a quick update folks....
(Note this is a repost... Seems my original post got lost...) I have successfully flown the Naza-H today in both Alti and Manual modes. All seems to be going well. I am still waiting on my replacement GPS. So when that comes in I will post an update on the progress as well. In other news: I am actively designing and building a GPS protector for my heli. I will post pics once I get the GPS installed and working. Stay tuned... |
12-24-2012, 07:06 PM | #273 (permalink) |
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Nexxusix,
That is great to hear. I am glad that you are up and flying. What do you think so far?
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AMA #844172 DJI S1000 Lightbridge Zen for 5D, S900 LB Zen for BMPCC, DJI Phantom 2 Vision +, P2Z2 with Data Link, P2Z3 with LB DJI Forum Support |
12-24-2012, 07:30 PM | #274 (permalink) |
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Wrong group. Sorry.
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MQX Quad,Align 550E/NazaH/GPS,Align450 Pro/CPII, Flame Wheel F450 Quad NazaM/GPS/GoPro3, Blade 350 QX/ GoPro3 Never lend money. It causes amnesia. Last edited by Stumblebee; 12-25-2012 at 06:26 PM.. Reason: Oops, posted in wrong group |
12-24-2012, 09:28 PM | #275 (permalink) | |
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The Alti mode held just like it was designed to do. The Naza-H in Manual mode is working correctly also. I have also completed the GPS protector build as well. Now all I need is my GPS, and I will post pictures and flying results as well. |
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12-25-2012, 01:18 AM | #276 (permalink) |
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Join Date: Dec 2012
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I'd hate to see someone run into trouble misunderstanding a mode because of propagating the wrong name. It is Atti mode, as in attitude, not altitude. Naza does nothing different with altitude control between Atti and GPS modes (other than having GPS alt data when available). With the damage a helicopter is capable of, I think it demands knowing as much as possible of the system and not assuming it's going to fly it for us right out of the box. I am reminded of the APS threads where people said they flipped the switch for the first time with the heli just a few feet off the ground and couldn't recover fast enough when it did a death-flip. 200 ft would have done wonders for a safe recovery. I got a wake-up call myself the other day. I had the Naza tuned nicely for my Trex 600, but I added an under-slung camera gimbal and the same settings almost took the copter down in seconds from swash oscillation (I even have video of that!). With a system that has so many configuration settings, be safe. As they say in full-scale, there are old pilots and bold pilots, but no old, bold pilots! Make sure you understand the system you are flying.
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12-25-2012, 03:20 AM | #277 (permalink) |
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Well said! I too have had my wake up call with my Naza-H system. So, now I have implemented extra "rules" to my flying habits. It is very easy to get complacent with automated technology... But in reality, one must be much more cautious when working with an automated system.
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12-28-2012, 09:42 AM | #278 (permalink) |
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Join Date: Dec 2011
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I've already posted this in the scale heli forum forum, and would like to add my two cents about not landing in atti or gps mode just yet:
I was experimenting with landings in GPS mode as I'd done the previous day. I landed nose in on the runway and this time tried to take off again. However, even when I pushed the cyclic up pretty far, the heli would not lift off! Instead it leaned back and to the right (still not sure if that was me or the system) and started grinding off my tail blades against the tarmac! I tried shutting it down with throttle hold, but quickly realized I needed to switch back to manual mode for that to work. After flipping the switch, the heli (cyclic still set for positive pitch) lifted off rather quickly now that the cyclic was working again (and it was still nose in at this point) so I brought the tail around, stabilized it, and set up for a landing in the grass. Considering the fact that tail disc was now half the diameter after takeoff, the tail held surprisingly well until it touched down a few seconds later in the soft grass. The next day, after replacing the tail blades (the only damage to the heli) I performed another experimental landing in atti mode. The plan was to quickly switch from atti to manual while at the same time hitting throttle hold the instant the heli touched down. This technique actually works provided you hit the switches all at once. Well, after touching down and having my timing slightly off, the heli performed a very violent zoom upwards. The heli acted as if it were in a cyclical resonance of some sort, hopped up and down then leapt into the air to about 20 feet altitude. Definitely something weird going on there. I'll be landing manually from now on, just wanted to see if that first landing that wiped the tailblades off was a fluke. The last four flights I've landed in manual mode with no issues. The GPS holds very well and atti mode is wonderful for scale flying. I have noticed that if I pitch or bank the heli too far in atti mode, I get a flashing red light on my led. Steady and gentle flights leave the Naza IMU in a happy state. [ame]http://www.youtube.com/watch?v=86IU2XmFW-w[/ame] Last edited by Helifan314; 12-28-2012 at 09:44 AM.. Reason: added youtube link |
12-28-2012, 10:31 AM | #279 (permalink) |
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This is what I do all the time now:
Get to about 1-2 inches off the ground in GPS mode Hit thottle hold Flip to Manual mode Done. Safely and softly landed.
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12-28-2012, 11:39 AM | #280 (permalink) |
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Hmm I like that...
I would like them to get this semi auto landing/takeoff sorted as its on my FPV bird and of course such a mode makes a good landing a piece of cake! This however sounds like a good solution in the meantime.
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Blade mCP X - Brushless, XP-7A, HP05S Gaui X2, BeastX/Scorpion 3400kv/YGE-30A/GS-093/DS95i Align AH-1 Cobra (T-Rex 500) Align T-Rex 600 EFL Pro, SK720/600MX/YGE-90HV/BL9180/BL9188 |
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