The SRT seat belt tensioner GT allows for a limited budget to make the negative Gs (braking, ABS, shifting) credibly felt. It works with Simhub.
Final rendering :
Frankly very nice. At the first braking, we say to ourselves “Well, maybe it wasn’t worth the trouble…”. After a few laps we forget it. Then it’s when the belt doesn’t work anymore (yes because at the beginning, there were some tests…unsuccessful ^^) we can’t do without it anymore… we have again the feeling to play a video game, and not to drive a race car…
The system is quite precise, it engages immediately, and you can feel the braking difference between an F1 and a base car, you can also feel the activation of the ABS.
It’s probably not precise enough to use the information to dose the brake, like “ah it’s not working for me, I can brake more”.
NOTA BENE : The harness tensioner can be dangerous. At full power, it is very stressfull around the clavicles. Therefore, an emergency stop button must be installed.
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The harness tensioner consists of a harness (4 or 5 points), an electric motor, an electric motor driver, and an arduino board connected to Simhub.
The motor pulls the belt backwards, it gives the impression of being thrown forward, especially in VR.
The 3D files are available on the download page.
- A 350W electric motor.(Amazon, Aliexpress, Ebay)
- 24V 15A 360W Power supply. It can good a good idea to add an emergency stop (Amazon, Aliexpress, Ebay)
- Motor driver 60A (Amazon, Aliexpress)
- Arduino Uno. Any clone will do. However, clones do not necessarily have the same dimensions, and therefore do not necessarily fit in the cases. (Amazon, Aliexpress)
- XT60H connectors. This connectors allow to easily disconnect the motor (Amazon, Aliexpress)
- A 4-point harness. 5 points aren’t very comfy under the belt…you see what I mean ? (Amazon, Aliexpress, Ebay)
- 0,1kg PLA (Amazon)to print the rewinder.
- Bicycle brake cable (Aliexpress).
- SHF12 (it goes inside the drum. I recommand ordering from Industry&CNC because it comes with the 8mm adapter) (Aliexpress, Amazon).
- 2 x Vis M4x15. This Amazon kit contains the two screws
- 1 x Vis M4x40 (replaces the screw from the SHF12) (Aliexpress)
- 2 x Vis M6x25 (SH12 tightening)
- 1 x vis M8x20 with nut to tight the cable
- 4 x M6x15 to fix the motor on the motor mount.
- 4 x M8x20 to fix the motor mount on the aluminium profiles.There is two motor mount, one for 8040 extrusions, one for 10050 extrusions.
- 2 x vis M8x25 to fix the belt
IMPORTANT : The harness tensioner can be dangerous. At full power, it is very stressfull around the collarbones. It is therefore necessary to provide an emergency stop button.
Make all the connections with the power off.
Do all electronic tests without any parts on the motor’s shaft.
Once the tests have been carried out, and the belt installed, carry out the tests in 10% power increments.
The belt drum is mounted on the motor shaft.
The connection of the power supply and the motor to the driver is indicated on the PCB.
A. Preparation of the driver :
- Unscrew the two screws
- Using a cutter, cut the track above the 8-pin transistor (ne555p). Still using the cutter, scrape the pcb in order to clear the yellow coloured track, then solder a wire to it, to be connected to pin 10 of the Arduino.
- You may have another version of the PCB (newer ?). In that case, do the same modification :
- Close the driver with the two screws. Connect the mass of the driver (Power -) to one the Arduino (GND) pins.
B. Setting up the Arduino card on Simhub :
- On Simhub: We flashe an arduino with the PWM signal function (which is generally used to drive fans to make a wind simulator) and the deceleration function is associated with it.
- Our motor is associated with the deceleration function in the “motor output” tab of ShakeIt Motors :
- The deceleration effect is set as follows. To be on the safe side, the power will be increased in 10% steps. Attention, when you test your settings in simulation, use a car with a high braking capacity (single-seater, F1…).