Pololu Jrk 12v12

Sure is fredspeed they use the main chip but a very big difference in the rest, bascilly the Jrk has one of the vnh2sp30 motor driver chips sets on it with alot more to handle feedback,internal memory(once set just send the command via usb and it runs),voltage reg,etc. I strongly believe Thanos unit is far better just could not source the parts here in Australia easily. So researched motor controllers and found the Jrk12v12.

no worries peter any further questions on card setup just let me know.
Happy to help. :yippiee:

I have Thanos amc buildt, and I might try to use nh2sp30 together with amc, if I fail to make a functioal h-bridge. Why do you think Thanos amc and h-bridge is far better than Pololu jrk 12v12 ?

Fred

I have the same question.

First having people with handyman knowledge on fault checking the electronics of card is a big plus,
Pololu are a commercial card and have expressed they have no interest in helping people on their forum with question to Jrk's in Xsim. Poor support plus once asking question the just refer ya back to the manual and talk in technical jabber. Plus the card really doent have enough resolution in low and they wont answer on how to set it high. But in turn Jrks are perfect for people with little eletronic knowledge
to get sim up and running very quickly, just buy the card, a suitable moter (i recommend a 12v with right angle reduction gearbox attached not worm gears, suitable pot (1 turn alittle rough ya seem to only use 1/2 of its scale, so 5 to 10 turn pots geared to the motor spindal really smooths it out.), good power supply. Wire it all just 3 solder points for the pot, plug it in, set ya max/min in pololu config, setup uso's in xsim,etc and drive ya heart out, oops i forgot the profiles they another story.

So inturn Jrk's just lack support from Pololu. Thats what made my decision.

So the AMC is way better because of Pololu's lack of support?

I thought you are commenting on their performance. With a plugin, X-Sim can easily use the full resolution of the jrk, but not with the current USO parsing.

I think with the second generation of Thanos' electronics (including a redesigned, more reliable motor driver), your statement will be valid.
If there is a way of implementing the thermal/overcurrent protections to save innocent builders from frying their stuff, it will be great success!
Go Thanos go! :clap: :


You are right, the jrk is perfect for people with little electronic knowledge, which is about 95% of the sim builders here.
Those who have electronics knowledge will probably build their own controller.

ok i am definatly not a programer so i am probably way off the mark here and if i am please let me know.

so i have been studying the pololu manual and online documentation and it states 0xc0 is the code for hi resolution comands so i converted that to decimal and that gives me the code ~192~~a01~ for axis 1.

i put this into the uso screen and my motor seems much more responsive can anyone els verify this as im just useing a tiny 12v motor on my test bed and it may be more noticble on a bigger motor

That is interesting because you are still passing an 8bit axis data to it.

If however the controller is now using 10bit resolution for the feedback value instead of 8bit, it is very possible to see some improvement.

I don't have the controller so I can only speculate here.

ok guys looks like i've been using high resolution all along.
Now awaiting it to be confirmed by pololu.
221 is high.
225 is low.

Changed my values and well to my surprise moving the slider by 1% causes to sim to move slightly were as before it wouldnt until i moved it 3-4%. Not sure why the card was responding they(pololu were baffled at this, hence why i dont like the support that comes,suppose its free support)

Hope this helps, will be testing values tonight on rfactor and dirt.

Sorry guys.

Hi, Is it neccesary to buy pots? can I use this controller without aditional pots?

Thanks

what is advatage compare to this? im using this with my microchip controller
Dual VNH2SP30 Motor Driver Carrier MD03A

alexsplanet: You can use the controller without pots in open loop as a speed controller. There are much cheaper speed controllers if that is what you want.

kubing: See the second post on the previous page.

look awesome. but is it for i motor only? need 2 piece for 2dof? ;D

correct kubing 2 controllers to control 2 motors to have 2 dof.
I have just bought my 3rd Controller and I'm in the middle of building yaw frame and rollers to change my unit to 3 dof.

Just a question... Say you have two pololu-jrk controllers. You are sending each axis to each them. Sending X axis to one, Y axis to the second.... How you make it move the motors combined like the Frex-like seat??? In profiler? Is there such option?

Well if get this right I have two motors hoooked to a Jrk12v12 each, both use a different virtual comport so in the uso i seperate an axis each to a com port each.
Using a mixed profile one axis two axis
27 inverted inverted
28 inverted inverted
26 non non
30 non inverted
25 inverted non
23 non non

Seems to give me real nice feel all running a 100%.Have old vid on youtube but must redo with new feedback setup and direct communication with x-sim much smoother but still can shake ya teeth. lol.

Older vid of Wiper motor setup and only using 27 26 and 25 in profiler.

http://www.youtube.com/watch?v=n9pHEEuZ3B8

Can you post your profile here please? I can't understand your description... Maybe its easier to see it on profiler. :

hope i got it right.

Rfactor - British Touring Cars - testing, so be kind.

cheers

hi, someone runs with GTR2? (In the configuration with the Pololu Jrk 12v12, SFGT, 2 DOF ...) thanks

yo gtr, gtr2, evo, race07, lfs only one i cant get to run is dirt.
Whats up.