As soon as the disc springs come into action the pedal gets quite stiff and the force is transmitted to the load cells. The Pedal is very soft for the first ~2cm and doesn't act on the load cells at all (in a real car you also have some pedal travel with very little pedal force and no braking at all until the brake pads start touching the brake discs). Recently replaced it with a stack of disc springs and am very happy with how it works now. Inside the original spring housing i started with a piece of garden hose with v-shaped cutouts, which worked OK, but had a considerable hysteresis effect. To get the right feel in the pedal I used a hydraulic shock absorber i had lying around from an old RC car. I also got a cheap digital bathroom scale for the load cells and designed a mechanical solution to apply the brake pressure to the load cells that seemed sensible to me. To avoid this you need to swap the wires coming from the load cells and connect the VRef pin of the IC to +5V instead of GND (I used an INA122P). Just be aware that with the layout given there you will end up with an inverted axis. I built my amplifier based on a tutorial over at, the guy also wrote a more general thread about load cells. The HX711 is not suitable if you only want to swap the poti for a load cell as it only has a digital (serial) output. In the original configuration with potis the output is 5V with pedal not depressed and 0V with pedal fully depressed, so my guess is the PCB in the Ricmotech kit is there only to switch the output around (so you don't have to invert the axis in every sim). Be advised, I’ve not actually completed this project and ended up installing the AXC Sim brake mod in it’s place, which comes at the same cost it would take to build a button load-cell mod.Ĭlick to expand.I also did a Load Cell Mod for my G25 Pedals some months ago, so maybe I can help here: The total cost for this project would come around $60 to $70 on the low end roughly. Very similar in design to that of Richmotech’s model. Provided in the spoiler below is all the most pertinent information I’ve dug up on building a button load-cell for the Logitech brake pedal. RD member Panicpete has also shared a lot of detail about his own project that can be found on this thread Some older research completed that is still relevant More general information about load-cells More details about straight bar based loadcells not specific to logitech RD member Grezson built one by using a 20kg straight Bar load-cell (which are very cheap btw) More details about bathroom scale based loadcells RD member GeekyDeaks showcases a bathroom scale based load-cell project on his github Seeing that I haven’t completed the work, allow me to showcase the work of others in my place, as this is starting to become more of a repository of ideas on the topic.
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