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ArduRover User Group

Dedicated to the exchange of useful information between members using the Arduino or other families of processors for autonomous rovers.

Members: 370
Latest Activity: 7 hours ago

Before Posting an Issue

Hi All,

Before posting an issue or a problem in the ArduRover Discussion Forum, please check the wiki table of contents, review the firmware release notes in the subforum, and search that subforum for existing answers to your question. Help avoid duplicate threads by finding other members with the same issue and their solution.

When formulating your post, use a descriptive title such as "rover will not navigate to waypoints in the Auto mode" (not "HELP!" or "Problem").

Please include the following information to help diagnose your query:

  • Describe the problem you are having. What is the expected verses the observed behavior?
  • Provide hardware information such as the brand and version of your autopilot, GPS, radio, and compass, as well as any other pertinent details about your rover setup.
  • What version of the APM: ArdurRover2 firmware version are you running?
  • For navigation issues, provide your tlog and/or dataflash log. Click here for instructions on retrieving a dataflash log.

TCIII

Discussion Forum

Which firmware version is currently best

Started by RoboBill. Last reply by Thomas J Coyle III on Monday. 9 Replies

I read somewhere the official 2.46 had track steering problems. I understand the current beta fixes that issue. Many thanks to all developers. But the current beta now seems to have disabled the…Continue

GPS precision on pixhawk ?

Started by heliboy. Last reply by heliboy on Saturday. 2 Replies

Perhaps only the developers can answer this question. What is the resolution of the GPS2 input on the PIXHAWK ? If we had a decimeter precision GPS would the Pixhawk correctly use the higher…Continue

custom R/C controller and apm2.6

Started by Apostolos. Last reply by Thomas J Coyle III on Saturday. 5 Replies

Let me ask a silly question.I'm trying to build a custom R/C controller to control my rover.What sticks are used to control a 4wd rover with skid steering ?can someone explain what the left stick…Continue

Configuring the ArduRover with the Mission Planner

Started by Thomas J Coyle III. Last reply by Charles lakins Oct 12. 145 Replies

Hi All,I have started this discussion to help members, like myself, who have really had only limited experience with the Mission Planner (MP).Since the MP can download the latest or any version of…Continue

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Comment by Bot Thoughts on May 16, 2013 at 1:16pm

FYI, RedCat Racing, ExceedRC, and a couple of other brands carry some of the same models. Do a bit of research on durability. I have seen folks post that they like RedCat; it's not clear to me if the models are identical or if there are differences in plastic or what. Just read up on the RC sites.

Comment by John Moore on May 16, 2013 at 7:58am

@Kabir,

Another platform to consider is the RedCat Racing (www.redcatracing.com).  My buddy is running a cheep rock crawler which he paid $150 for which perfoms really well.

Another one I considered was the 1/8 scale MaxStone crawler by exceed found at www.nitrorcx.com

John

Comment by Bot Thoughts on May 15, 2013 at 6:06pm

@Kabir - to get a "hobby grade" RC vehicle, you will need to spend at least $100. But you can get something good for under $200.

I have an ExceedRC Sunfire 4x4 buggy I got as a used roller for $60. For on road, probably ok. Off-road, suspension is absolutely terrible. Mixed bag; you'll probably buy it and want something better at some point.

Far better value can be had at the $150 and up price point. I and many others love ECX RTR kits. They are known to be very durable, low cost, easily upgradeable. ultimaterc.com has a whole sub-forum devoted to them where you can learn everything.

My rover, Data Bus, is based on an ECX Circuit. I've crashed and rolled and flipped, and just beat the snot out of it for the last three years. It's been running a brushless setup for the last two. I've only broken/bent a few items in extreme collisions and all the parts are dirt cheap. They now come with a 2.4GHz radio. The suspension is good, can be upgraded, gearing, motor, esc, all upgradeable. But in stock form it's quite usable.

I don't have personal experience with Duratrax but worth looking at. That brand has been around awhile and has some following. They have at least one entry level stadium truck you could go with that isn't too costly.

Helion is Hobbytown USA's house brand, but carefully check into these for durability, check ultimaterc.com reviews, etc. I don't have personal experience with them.

I also picked up an Ofna Hyper10TT 4wd truggy roller for $150 + $130 for a nice big Tekin motor, and a small sum of $40 for a HobbyKing ESC. This is a fine RC truck, high quality suspension, excellent shocks, aluminum chassis, etc.

For awhile I had an Ofna JL10E which I put together for something like $200? I just stuck a Traxxas Titan12T and XL5 ESC on it. Ran fine on the street but very little clearance. Also a quality machine.

Spend some time on rctech.net, ultimaterc.com, or rcgroups.com, look for used deals if you want, or just learn about different new options.

Hope this helps.


Admin
Comment by Thomas J Coyle III on May 15, 2013 at 9:02am

@Kabir,

I have found that you get what you pay for in the quality of rovers. I use Traxxas truck chassis. I built my first Traxxas E-Maxx chassis from new parts off of eBay for about $400 USD. My AVC Traxxas Slash rover started at a "roller chassis" for $88 USD, but you have to add a motor, ESC, servo, receiver, wheels, and a battery to get it up and running.

The cheaper chassis will usually not last as long and will break fast nickel and diming you with part replacements.

Check out this thread: http://www.diydrones.com/group/ardurover-user-group/forum/topics/wh...

Regards,

TCIII

Comment by Kabir on May 15, 2013 at 8:55am

Guys, what would be a good ArduRover platform sub $100 if I don't want build one myself?


Admin
Comment by Thomas J Coyle III on May 15, 2013 at 8:45am

@Pooja,

I am presently using the stock PID settings. Each rover will be different so it is hard to generalize.

Regards,

TCIII


Admin
Comment by Thomas J Coyle III on May 13, 2013 at 2:15pm

@MVeloso,

Yes, that is correct. However, CRUISE_SPEED is in meters/sec. Also, CRUISE_THROTTLE, in percent, sets the base throttle percentage, which is an estimate, to reach the mission cruise speed (CRUISE_SPEED). If you want fast vehicle performance it is best to keep SPEED_TURN_DIST around 2 meters and SPEED_TURN_GAIN around 50% or greater. My rover can go through the curves at 5 m/s so I have the SPEED_TURN_GAIN set at 75 - 100% with a CRUISE_SPEED of 5 m/sec.

Regards,

TCIII

Comment by MVeloso on May 13, 2013 at 1:08pm

Thank you Thomas.

You mean SPEED_TURN_DIST and SPEED_TURN_GAIN .

 SPEED_TURN_DIST is 3 m  and the SPEED_TURN_GAIN 35%

And I reduced CRUISE_SPEED to 55 %.

 

 

Regards.

 

MV


Admin
Comment by Thomas J Coyle III on May 13, 2013 at 11:27am

@MVelsos,

There are two ArdRover2 parameters that affect the velocity of a turn. The first one is the velocity through the turn, the default being 50% of the cruise speed, and the second, which defaults to 2 m, sets the distance from the turn that the velocity starts to be reduce.

Nice video by the way.

Regards,

TCIII

Comment by MVeloso on May 13, 2013 at 8:51am

Testing ArduRover v 2.41 AR2

My Rover:


1/10 buggy chassis LRP S10
Motor: S2838-2800 Brushless Inrunner (2800kv) from Hobby King.
Esc : 40Amp for aircraft.


APM 1 with HMC5883L - Triple Axis Magnetometer and 3DR GPS uBlox LEA-6
Firmware : ArduRover v 2.41 AR2.

I began the tests with the old GPS MediaTek but soon realized that I had to change to the new model. The precision is much better with the Ubox LEA-6.
This was the first conclusion.


I noticed a difference with the saved WPoints on the ground and the points on the Mission Planner. There is a difference approximately up to 2,5 meters.


For an aircraft it is nothing but for a ground vehicle has some relevance.
So, taking into account we are working with civilian stuff I guess we can not improved the precision programming via MP.


So to increase the precision I introduced the difference( kind of drift) between the point where the Rover turns and the point recorded on MP.


I noticed that the speed of the vehicle is decreasing loop(turn) after loop.
So that is my short report.


And the video:

http://www.youtube.com/watch?v=5lSX4837gPg&feature=youtu.be

Regards.

MV

 
 
 

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