The firmware code relies heavily on the excellent V-USB library by Objective Development.
Racing simulator handbrake software#
Programming the ATtiny is pretty easy, I use the avrdude software and an USBasp ISP adapter.
After debugging a few problems related to my own stupidity, the PCB was ready to be programmed. Next, I printed, etched and assembled the circuit. Two capacitors are used to smooth out the power supply, but I think they are not strictly necessary. Schematic of the control circuit.Ī red LED is used to signal the operation status, and two Zener diodes are used to drop the 5V supply voltage down to 3.6 volts for the USB signal lines. The circuit is fairly simple, all the logic is handled by an ATtiny85 microcontroller. For this, I designed and built a small PCB which presents the potentiometer data via USB to the computer. So, the next problem was somehow getting the movement data into the computer. Some small adjustments had to be made, but in the end it worked out fine. A spring (silver) provides the “mechanical feedback” to the user and also limits the amount of travel so the potentiometer does not break.Īll in all, the build went about 95% to plan. The lever then actuates a linear potentiometer (yellow), which is mounted on top of the clamp. The rail is then screwed to two L-shaped pieces of aluminum (red), which in turn are screwed to a desk clamp (green). I used a spare Actobotics rail (blue) from a previous project to mount a bearing for the lever (violet). The mechanical buildĪfter an inventory check of what parts I had lying around, I drew a quick and dirty CAD model: Handbrake CAD mockup. So instead I opted to a vertical design, which is often found in racing / drift cars hydraulic systems: E-Brake installed by Josh Buittner – Langhorne, Pennsylvania USA. Originally, I wanted to build a system similar to a classic handbrake in a commercial car: A standard handbrake lever.īut this quickly proved to be a challenging build, because I wanted to clamp the thing to my table. Surely I could build something equivalent similar out of parts lying around? Inspiration So, I set out to acquire a handbrake controller, but quickly decided to build my own after seeing the retail prices often above 80€. And pressing a button on my steering wheel controller just doesn’t cut it in terms of control and realism. But sometimes, there is also the Need for Smooth Drifting Around Tight Corners.
Of course, there is always a Need for Speed in racing simulations.
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