Open Sim Wheel
The Open Sim Wheel is a powerful direct-drive steering system for sim racing. By attaching a wheel directly to a powerful servo motor, strong and detailed force feedback can be achieved.
Hardware choices
Servo Motor
| Motor |
Power |
Price |
Peak Torque |
Holding Torque |
Encoder Resolution |
Motor Weight |
Motor Inertia |
Torque Coefficient (datasheet) |
rated speed |
| Mige 130ST-M10010 |
1.0 kW |
US$ 237 |
20 Nm |
10 Nm |
10000 |
11.5 kg |
19.4 kg cm^2 |
2.2 Nm/A |
1000 rpm |
| Hobbystar Motor |
1.0 kW |
US$ 237 |
20 Nm |
10 Nm |
10000 |
11.5 kg |
19.4 kg cm^2 |
2.2 Nm/A |
1000 rpm |
| Mige 130ST-M15015 |
2.3kW |
US$ 332 |
30 Nm |
15 Nm |
10000 |
14.4 kg |
27.7 kg cm^2 |
1.58 Nm/A |
1500 rpm |
| Lenze MCS12H15L |
1.6 kW |
1200 € |
29 Nm |
11.4 Nm |
16384 |
9.5 kg |
7.3 kg cm^2 |
1.40 Nm/A |
1500 rpm |
|
Motor Drive
USB Interface
Note: Shipping can be quite costly. eg. AUD $34.00 for one board! If you can try and round up some OSW mates from forums and group buy.
If you can't wait, try to buy all your electronic gear from the same place. Will save you loads in shipping.
Note: The SimuCUBE controller already contains an STM32F4, so if using the SimuCUBE controller, separate STM32F4 Discovery and Discovery Adapter Boards are not needed
Motor Mount
Motor Shaft Drive Lock Bushing
Wheel Hub
Quick release (optional)
| Quick Release |
Price |
| Q1R |
€66.00 + €58.00 (for 1 base, 1 wheel set) |
|
Enclosure
The Aliexpress DYT-1 case fits Argon with 4 heat sinks, 24V PSU, Braking Resistor, Discovery Board, Denis adapter board and everything else quite well.
Note: There is extensive drilling / hole saw required for fan, glands, switches, fuses etc. Pictures to follow shortly.
Wheel, buttons, shifters
Misc.
Emergency Stop Switch
Power input socket (IEC, Switched, Fused, EMI Filter)
Cable glands
Usb A to B Cables x2
Panel Mount Fuse Holder (250V 20A)
Software requirements
MMOS
This software comes in two parts. There is a USB game controller driver, along with a custom firmware for STM32F4 Discovery Board. MMOs Software from Virtual Racing Thread
Granity
This software is from Granite Devices is used to program the Argon or Ioni motor controllers.
Granity by Granite Devices
STM32 ST-LINK utility
The software is used to flash the custom MMOS firmware onto the STM32F4 Discovery Board. If using Windows 8.1, you may need to run this program using Windows 7 compatibility mode.
ST-LINK Utility
Resources
Tutorials / Guides
Tutorial
Info (spanish)
Pictures of finished wheels
Videos
iRacing & Lenze
Osw videos
Discussion Forum Links
X-Simulator - http://www.xsimulator.net/community/threads/diy-opensimwheel-net-selbermacher-servo-lenkrad.5699/
iRacing AUS/NZ - http://members.iracing.com/jforum/posts/list/3306077.page
iRacing Hardware BruteForce Part 1 - http://members.iracing.com/jforum/posts/list/3282974.page
iRacing Hardware BruteForce Part 2 - http://members.iracing.com/jforum/posts/list/3293316.page
Forum OSW in Spanish - http://simracingcoach.forospain.net/open-sim-wheel-f2
3D File Links
OSW-Related Manufacturer Links
Ascher Racing
Granite Devices
Lenze
Mige
Sam Maxwell Customs
Team HRS
Reimer Motorsports
Tools needed
| Tool |
Details |
Description |
| Soldering Iron |
A 40W iron with a pencil tip should do everything needed for this build |
Joining cable connectors |
| Screwdrivers |
|
For driving screw |
| Allen Keys |
|
For case hardware |
| Wire stripper |
Automatic wire stripper will make life easier |
Stripping various size wires |
| Drill, various bits |
Drill press will be easiest and neatest, hand drill can do the job |
For putting holes in your case |
| Step Drill Bit (up to 20mm) |
For making neat panel mount holes in the case at larger sizes |
Drill normally first! |
| Tap and die (opt.) |
|
If you want to tap threaded holes in your case |
| Centre punch |
|
For marking the centre of your drill holes |
|
Example Build Lists
Build List #1
| Element |
Part |
Price |
Justification |
| Granite Devices: |
|
|
|
| Motor Drive |
Argon |
€489.00 |
|
|
… Simple Motion V2 USB adapter |
€19.50 |
To go with Argon |
|
… Simple Motion V2 Breakout Board |
€6.25 |
To go with Argon |
| Digikey: |
|
|
|
| USB Interface |
STM32F4 Discovery |
$14.88 |
USB interface with button and analogue inputs |
| Components |
Heat Sink x4 |
$4.38 ea. |
For Argon |
| … |
Fuse Holder x2 |
$2.98 ea. |
One for AC input, one for braking resistor |
| … |
Ring Terminal x6 |
$0.46 ea. |
For grounding etc. |
| … |
D-Sub Cable |
$7.44 |
Dsub cable and connector at one end (for encoder/Argon connection) |
| … |
26 Pin IDC Cable |
$1.78 |
IDC Cable with connectors (for Argon) |
| … |
IEC Power Inlet |
$8.18 |
Socket for AC input to case |
| … |
RJ45 Coupler |
$13.76 |
Socket for RJ45 entry to case |
| … |
Rocker Switch |
$1.50 |
Switch for drive enable |
| … |
DB15 Backshell |
$6.13 |
Backshell for DB15 connection (encoder cable) |
| … |
Emergency Stop Switch |
$27.30 |
Emergency stop for Argon |
| Newark: |
|
|
|
| Braking Resistor |
Braking Resistor |
$54.49 |
Braking resistor |
| Components |
4-pole connector plug |
$6.50 |
Motor power connector |
| … |
4-pole connector socket |
$2.49 |
Motor power connector |
| … |
USB Coupler x2 |
$8.91 ea. |
USB connections for Discovery |
| Ebay: |
|
|
|
| Components |
USB-A to Micro-B cable |
$4.00 |
For Discovery |
| … |
USB-A to Mini-B cable |
$4.00 |
Also for Discovery |
| … |
DB15 Breakout connector |
$6.30 |
DB15 Connection |
| … |
24V 3.2A Power Supply |
$23.90 |
For Argon logic power |
| Hobbyking: |
|
|
|
| Components |
Silicone Wire x 5m |
$1.14 m |
Flexible power wire |
| … |
Cable sleeving, 8mm x 8m , 10mm x 4m |
$0.60 m |
Pick your favorite color |
| Mige: |
|
|
|
| Servo Motor |
Mige 130ST-M10010 |
$237.47 |
Ask for 'keyway unmounted'. Can save on shipping if ordered in pairs |
| Motor power and Encoder Cables |
Order with motor from Mige |
~$30.00 |
Ask for these to be supplied with connectors attached to 3m cables. |
| Beyond Monkey: |
|
|
|
| Quick release |
Quick Release Base and Wheel Side |
€66.00 + €58.00 |
Sturdy quick release system |
| … |
OSW Adaptor Kit |
? |
70mm adaptor from drive lock, also needed |
| Motor mount |
Mige Motor Mount |
€65.00 |
Right angle motor mounting bracket |
| Other: |
|
|
|
| … |
PCB Edge Mounting Kit |
$2.95 |
Easy way to mount PCBs without holes drilled in the board |
| Case |
Raijintek Metis Mini ITX Case |
$59.00 |
|
Drive Lock
Wheel of your choice
Assorted heatshrink etc.
Build List #2
| Element |
Part |
Price |
Justification |
| Servo Motor |
Mige 130ST-M10010 |
US $252.56 |
Cheaper Mige, high torque coeffecient |
| Motor Drive |
Argon |
€489.00 |
Relatively expensive, but saves on needing large external PSU as with Ioni. Argon comes with 2x RF chokes, D15 solder plug and 26pin connector for ribbon cable |
|
… PSU 24VDC 1A |
AU $6.00 |
Small DC power supply for Argon logic |
|
… Simple Motion V2 USB adapter |
€19.50 |
To go with Argon |
|
… Simple Motion V2 Breakout Board |
€6.25 |
To go with Argon |
|
… Argon 150W 100R Resistor |
€24.68 |
To go with Argon |
| USB Interface |
STM32F4 Discovery |
US $22.75 |
USB interface with button and analogue inputs |
|
… Disco Adaptor Board
ed.remier-bi|ofni#ed.remier-bi|ofni |
~€45.00 |
Adds ports to Discovery board, saves on extra connectors and complication |
| Motor Mount |
Ascher Racing Mige Mount |
€65.00 |
Aluminium mount to suit Mige motor |
| Drive Lock Bushing |
Belting Online DL13/22 |
£9.06 |
To attach the the hub to the motor shaft |
| Wheel Hub |
HRS Team Custom |
AU $100 |
To attach 6 bolt wheel or quick release to bushing |
| Quick Release |
None |
|
Just using one wheel for now, bolt direct to hub |
| Enclosure / Case |
Weiliang Audio #81 |
US $65 |
Small enclosure to fit Argon, 24V PSU, Discovery Board and Disco Adaptor. Comes with hardware, rubber feet and fused IEC socket |
| Wheel |
Sparco P104 Sport |
|
Cheap, has buttons, didn't want suede |
| Paddle Shifters |
Ascher Racing Formula (Universal) |
€125.00 |
Stiff carbon shifters, crisp shift |
| Miscellaneous |
Emergency Stop Switch |
AU$2 |
|
|
IEC Socket, Line Filter, Fused with switch |
AU$20 |
|
|
Fuses, 10A, Fast Blow |
AU$2 |
One for 240V input, one for Resistor |
|
Fuse Holder |
AU$2 |
Only need one for braking resistor. The IEC socket with the enclosure is fused |
|
PCB Standoffs x4 |
AU$2 |
Will attach Dennis Board (and therefore STM32F4) to the enclosure |
|
Cable Glands x4 |
$2ea |
To run neatly run cables through case. One for encoder, motor power, one for E-stop, one for USB out of case |
|
Ribbon Cable x1m |
$3 |
To create connect to Argon |
|
USB Cables x2 |
$5ea |
To connect Dennis board to PC |
|
Thermal compound |
AU$5 |
To help heat transfer from PSU, Argon, Resistor to the case |
|
Heatshrink |
|
Covering cable terminals |
Bibliography
1. full source reference