Making an adaptor cable for pedals
A long time ago, I bought some Logitech G27 pedals. I have a Logitech Driving Force GT wheel and pedals. Surely I can make them work together?
Pedals? Wheel?
A keyboard/mouse or controller isn't always the best input method for phyiscally interfacing with a digital game. In this case, if the digital character is operating a motor vehicle, such as a car, then replicating a cars controls is the optimal interface. That's what Logitech did with the Driving Force GT wheel and pedal set. Here's a little diagram of how they connect, female socket left.
| Colour | Purpose |
|---|---|
| Red | +5V power |
| Yellow | Presence |
| Green | Accelerator |
| Orange | Brake |
| Black | Ground |
What's the problem?
The pedals that come with the wheel are ... cheap. And bad. Simple springs and fully plastic, plus a bit too small and they're generally just low-quality. Meanwhile, the Logitech G27 (and G25 / G29 / G920 / G923) come with a different set. These ones have metal pedals, proper mechanisms and high-quality springs to provide the right feel, plus a clutch pedal. Unfortunately, they are not directly compatible, as the connectors are slightly different and the wiring is incorrect.
| Colour | Purpose |
|---|---|
| Red | +5V power |
| Green | Accelerator |
| Orange | Brake |
| Blue | Clutch |
| Black | Ground |
The solution
Using a DB9 serial extension cable, pull out the top two corner pins (#1 and #5) so it fits into the Driving Force GT socket. Cut it in half and resolder it together with the correct wiring. Lastly, you may need to open up the G27 pedals and swap the +5V and ground wires on the accelerator, as the Driving Force GT seems to expect them to be reversed.
