Sim Hub Wind Simulation Kit

If you are getting warm during races because of a VR headset or hot and sweaty fighting for position then you need the Simhub Arduino ShakeIt Wind Simulation mod. There are numerous solutions available such as boat blowers and 4 pin PWM (Pulse Width Modulation) fans. My first configuration was built around a 12v Boat Blower and although this worked I wouldn’t recommend it now because:

  • Noise – the boat blower is really noisy.
  • Pipework – its surprisingly inflexible, gets in the way and can put stress on the printed parts.
  • Performance – although it can move air the motor shield isn’t great at dealing with different output values where as PWM fans do this much better.

My recommended solution is to use 120mm 4 pins fans but not just any old fans! The GDSTIME GDP1238 Axial Fan is a 12v DC fan that can move up to 227CFM at 6000rpm!

Which ever way you go the following parts give you the basic blower unit and air flow straighter plus a box for your Arduino Uno. All the printable design files are available for download from Printables and I offer a printing service to UK sim-racers. The 120mm Fan adapter is available here.

120MM 4 PIN FANS

The great thing about this solution is it avoids the requirement for a Moto Shield, used for the boat blowers, simplifying the electrics and as the fans are PWM they will run at a greater range of speeds without complaint. The circuit still utilises a 12V DC supply and its essential that the grounds are linked. The fan tacho pin is left disconnected.

Power Supply

After a few months of running my fans started to cut out after a while and then they wouldn’t start at all. Initially I thought it was a USB or Arudino problem as the PSU was still giving an output of 12v. Eventually, I needed to test with a second PSU but a super fruitful discussion with someone on the SimHub Discord I realised I may have made a boo-boo on my original PSU choice.
The TLDR here is avoid laptop style PSUs and go for something like you would find on a 3D Printer e.g. Meanwell RSP150-12. Mounting/End Cover for this PSU can be found on Printables.