Joyrider K8055 interface

Hi,
I have been making a joyrider sim using aK8055 interface and wiper motors. So far its has been fairly straight-forward. At the moment I am working on the lateral movement only so once thats working, I'll get the second axis working. For the last 2 weeks I have been trying to get the profiler motion working lately and can't seem to get it right. I think I have worked out that I have the same issue as here:

http://www.x-simulator.de/forum/urgent-cannot-complete-calibration-autorun-too-little-on-y-t723.html

At the moment, I have come to a crossroads though. If I remove IC1 like it says in that post, the pots work really well and I get good readings but, the output doesn't work. So then I put IC1 back in and the outputs work but now the pots don't work.

Question:
Is there a halfway hack for this where I can leave the IC1 in but have it only work on the outputs? I know I could use a second board but I would rather not.

Thanks,
David K

OK, I have figured out that I can remove pints 1,2,3,5,6,7 from IC1 but when I did this, I am back to not having enough +travel on the pot?? I am using a 100K pot and am using the entire travel of the pot.

I can get it to go left and stop but when I go right, it keeps travelling and doesn't stop.

I have bent the pins 1,2,3 and 5,6,7 and put the IC back in. Then I soldered as per the diagram.

The problem now is that only movement in the -ve direction is working, the +ve just keeps turning. Its like I need a second pot for the +ve motion? also the movement is not what I expecetd, that is to say, it moves to the position then back a bit. then when it returns to center position it doesn't go far enough.

I can't seem to get a 1:1 output from force profiler yet I have no maths functions on. what should do?

I have it working now but the output is not enough for the motor to move. I need to scale the output somehow. the functions I can find only seem to allow up to 100%. is there something else I can do to increase the output?

yep no problems.

I have built a wooden/aluminium framed joyrider. I am using wiper motors and am starting off with left/right movement only. If that goes well I will make a similar up/down motion like Thanos.

To control the motor I am using a speed controller from Ocean Controls (KTA-198 Dual Bidirectional DC Motor Speed Controller) and a K8055 to control it. On the K8055 I am using the analogue outputs and connecting them to the inputs of the speed controller. I am also using the K8055 analogue inputs with a 100K pot for the feedback in profiler.

When using the K8055 test program the motor moves as expected, as I go from 50%-100% it goes one way and 50%-0% goes the other way. So I am sure that everything is working.

In profiler I have now got it working but the output is not large enough to make the motors move. the output graph is looking ok now. though the main problem I have had is getting the input potentiometer right. The change in the K8055 you suggested made it a lot more stable but if I make it have enough output, the output graph looks nothing like the input graph on the maths page.

thanks
David K

This is the latest file from Profiler that I have working except the output is too small.

working with input.rn2

thanks

Here is a picture of my joyrider, more to come.

that was an old photo, probably a month old. here is one I took today:

I seem to be answering my own questions but...
I have got it going pretty nicely now. the feedback is even working correctly (I think) . I am wondering if maybe the motors that I have are not right. They don't seem to want to work below about 60%. The setting in the Global Minimum output in the axis output dialogue box doesn't seem like its working. I am not sure what it is doing.

It is like there is a deadzone in the middle of the motor motion. I think what I want to do is say what the minimum is per output -ve/+ve direction. Is that right?

I think I have worked it out. For those with a similar issue, it doesn't look like there is a right or wrong motor. I have been playing with the PID values in the Axis settings. I have had to set it to use proportional 2.4 and dirivative 2 and now the graph is right. The Deadzone that I had is now not an issue and the device is working well. Now I just need to make the motion less. I think I need a smaller gear wheel on my motor so that it can spin a fair bit with less frame movement.

Thanks
David K