Velleman K8055 + wipe motoren ???

Hallo an alle hier im forum

meine frage jetzt kann ich das board Velleman K8055 auch für wipe motoren nutzen ?

Hello to all in this forum

My question now I can use the Velleman K8055 board also for wipe motors use ?

Hi there fella - I'm afraid that this topic isn't going to get much love around here (going from my own experience), but the subject is one that interests me, and I have done much research into it recently so I will tell you what I can...

The quick answer is yes - the K8055 can be used to drive wiper motors, and I know that, because I have done it! (I am still refining the design, but will post full instructions of my attempt when I finally get a seat on the frame and try driving with it!!)...

I hope that someone who has tried this before will contribute to this thread, but there are many posts like this one (my own for instance...) that get ignored, so i do not hold too much hope.

Even though the topic is not popular, I believe that the K8055 has a place here as it is so cheap, prebuilt, has the potential to fully control 2 motors per board, and is fully supported by X-sim!!

It may be argued that they are slow and so would only be any use for flight sims - and that is a fair comment - but at less than half of the price of just buying the components for Tronic's AMC (excellent though that is), I believe the K8055 should be taken seriously none the less!

It seems that the general feeling here is that they are inferior to other solutions - and I would agree with that too, but that is not putting me off experimenting!

Now, the K8055 itself IS used here: some of the guys use them to feed data back, and then drive motors with other USB controller boards... Some it seems are looking at using them to drive guages rather than motors.
I believe they are also used for controlling pneumatic rigs? - someone please keep me right here...
...just not for the wipers themselves!

I am in the prototyping stage (and yes, the electronics really do work) of driving 2 wiper motors with my K8055.

The drawback (according to my understanding of other peoples experiences) is that there is bad lag on processing resistance from the feedback pots - this is probably due to the k8055 feeding back data to the processor and then having to receive its instructions back from the PC, rather than calculating positioning data onboard like Tronic's AMC does.
(It may also be down to slow pcs - I don't have a problem there, but my gaming machine is very good and I use the function to isolate X-Sim onto only one CPU).

They can also drop out on you as software crashes, which can have interesting results!! Breaker switches on extremes of position are a good idea!

The electronic setup I am using is based on a design I found on the Velleman forum for a relay solution using a double pole double throw relay, though I did also try mosfets which worked, but with bad power loss. Both circuits are below.

These circuits are not complicated, and I can claim no originality whatsoever for the designs of the circuits (though I have designed my own PCBs, which I will share once my solution is complete).

The source of the circuit designs is the Velleman forum. Pictures below should help you - I am using the relay circuit, and have simply doubled on one board to conveniently control 2 motors with one power supply.

I have tried both of these circuits, and they DO work.


all credit to vel255


all credit to paladinmicro.com


Please be patient and I will share my solution with you in full - at the moment, I am waiting on a matching pair of frontera wiper motors to arrive from ebay and I will be able to build a frame I can sit on - at the moment, i have only one motor for test - BUT IT DOES WORK!!

For my testing I am using LFS and X-sim.
It is early stages with my home made profile, but even now I have some success - as I accellerate in LFS, the motor speeds up... as I brake, the motor slows... as i stop the motor stops... and no noticable lag so far!!

maybe when my frame is built and i am able to video and display the results here I will be able to get some help with the profile... hopefully by then my experience with X-Sim will have grown, and the profile will be as good as I may hope for with the K8055... then I will be looking once again at the AMC design... for now, I cant afford it... but I already have a K8055!!

Good luck to you my friend!

Tim

Tim, I'm afraid not a lot of people have done what you proposed here.
Search for Riton's 2DOF AC. He uses the controllers for a different application.

Maybe you can find your solution there!
I could help out with the electrical things, not so much with the controllers.

I like the relay circuit for it's simplicity! Let's see how it performs!

:?

Me too - I can claim no originality for the design, but it works very well and it is super cheap (less than £10 for one relay setup) - with K8055 PWM set to 100%, the motor stops, set to 0% the motor is at full speed. The output from the digital out will set the direction, so in the maths calculation in profiler, you need to set the digital chanel output to on or off as well as setting PWM to the calculated figure on the analogue output

I have only one motor currently, so have had to test chanel one and two separately, but it seems to work fine

As soon as I have the wiper motors set up in my frame I will post a video - hopefully this will be before Christmas... though I am expecting GT5 to take up rather too much of my life when it finally comes out!

Tim

Hey bigtalltim :

Here's a video for you showing the Relay option I posted ealier in this thread - unlike the one you posted which had no speed control, this one uses PWM and produces very nice speed control.

It also gives you all the power from the battery/power supply, as none is lost as heat - to me, relays seem the way to go

http://www.youtube.com/watch?v=m5wlM9Irxnk

and heres the circuit again:


enjoy

Tim

Great job!

What you could improve:

-Use Logic Level MOSFET's instead of BJT's. Much better efficiency, power handling and switching characteristics.

-Use Solid State relays instead of mechanical ones. This will eliminate the mechanical wear on the contacts improving life, increase switching speed between directions and you won't hear it when it changes direction.

:clap: :thbup:

Thank you!

I will make a new version of the relay using components as you describe!

I have actually just finished etching a double relay pcb to control two wipers at the same time - I will post a video as soon as I get it wired up... the frame can wait

One other improvement I have just been playing with is the setting of the PWM threshold - in the video there appears quite a large dead spot... my motors have really benefitted from a 25% adjustment 8)

Tim

What PWM frequency are you using?

The BJT is probably too slow to turn on. You can try to lower the PWM frequency and see if it improves.

MOSFET's are much faster, they will work fine without adjustments.

I believe the K8055 has a fixed frequency of 23kHz hard coded into the board

Tim