NeoTokyo 3-DOF(traction loss) wiper motor Rig

[NeoTokyoNori]

As I have mentioned in the
"Arduino Open Source X-PID firmware" thread.
Here is the motorbike starter motor that I am experimenting with.


The idea is to make one of these, but just a tiny little bit bigger.


If this works, this rumble setup will cost peanuts compared to the buttkickers + amps + soundcard method.
Not only that, it will accurately replicate the vibration rate of the engine, unlike a sound frequency conversion method
which seems to be difficult to get right...

I borrowed some code from tronicgr led guage, which works through USO.
And I have the motor responding to the rev speed in xsim,
So the basics are there, but it is not yet stable ("comport write error" occurs after about 10 seconds).

But in any case,
It would be best to have it work inside the same code for arduino xpid on synaptrix.
because I would like to use the rumble motor on the 4th channel out of 2 driver boards.

So that:
Driver channel 1 = L Motor
Driver channel 2 = R Motor
Driver channel 3 = Traction loss Motor
Driver channel 4 = Rumble motor

I am wondering:
Is it possible to add or subtract code from the aruduino xpid code,
so that motor 2 has only pwm speed control, without any of the PID ?
sirnoname's code is quite complex !

[NeoTokyoNori]

UPDATE 2012-04-13
My G27 wheel decided to play dead.
So among a bunch of things to try to resurrect it, I contacted logitech.

The short version of the answer I got is:
"...we don't advise our customer to open the device.
It automatically voided the warranty. I am sorry about that. "

I wasn't ready to spend nearly $300, which I need to spend on building up the rig.
So I had to dig deep, and learn about smd components and circuit boards fast...

I managed to identify the damaged smd, with great difficulty
and the help of an application engineer at IC chip maker Maxim.

This is it:
NXP 74LVC1G08 which provides one 2-input AND function.
http://www.nxp.com/products/logic/gates ... G08GV.html

I sourced the part, which I got today.
I managed to remove the burnt smd, which crumbled to pieces, and left a couple of the contact pads in ruin.


Even with some exposed trace wires, I managed to solder the new smd into place,
and was able to check that the connections are working, without any shorts.
Nothing else on the board has any physical damage so:

if this works then
today is my lucky day
end if

But no such joy! The wheel is still not recognized by the pc,
So it looks like the main MCU failed somehow.
With all the over-voltage protection that should be built in the board, I cant believe this has happened!

I looked into the part, which I found out is this :
ST72F651AR6T1 : ST7 - LOW-POWER, Full-speed Usb 8-BIT MCU With 32K Flash, 5K RAM, Flash Card I/F
http://www.st.com/web/catalog/mmc/FM141 ... partnumber

But the MCU probably has to be programmed anyway, so there is no point of just getting the part.

I looked on the usual sites for a replacement main board, but no luck..
The best I can hope for now, is to buy a replacement motherboard from logitech..
Otherwise my sim racing life has been set back big time!

[motiondave]

Ok, not sure how you nuked it in the first place, But I know, the G27 set HAS to be mounted on wooden sheet and then you can bolt that to a frame, but keep in mind, the g27 set MUST NOT be allowed to have contact with its own mounting bolts to a metal frame.

[NeoTokyoNori]

Ok, not sure how you nuked it in the first place, But I know, the G27 set HAS to be mounted on wooden sheet and then you can bolt that to a frame, but keep in mind, the g27 set MUST NOT be allowed to have contact with its own mounting bolts to a metal frame.

Thanks dave, but on my current rig, the G27 is mounted on a regular pc desk with a wooden table, so the mounting bolt would not be an issue...
It must have been a lightning bolt from god.