Adapters

The best way to connect to the pedals is to build your own DIY adapter using a female DE-9 connector. This is simple to make and does not require any modifications to the pedal base. The above video walks you through the process of wiring to an Arduino Leonardo. Be aware that the wiring is different between the 3-pedal and 2-pedal versions; the video does not apply to the 2-pedal version.

If you want something more robust, an open source shield is available to connect the three pedal peripheral to a SparkFun Pro Micro. The design comes with a 3D printable case and custom board files so that the device appears as "Sim Racing Pedals" over USB. You can use this shield to build an inexpensive USB HID adapter.

You can find all of the necessary files in the project repository. Please note that this shield is also not compatible with the two pedal peripheral.

Connector


DE-9 Male Connector	DE-9 Female connector

^{DE-9 graphic from Aeroid @ Wikimedia Commons, modified for scale, colors, and creation of a complementary male version. These graphics are licensed under CC BY-SA 4.0.}

The Logitech pedals connect to the wheel base units using a male DE-9 connector. Note that most jumper wires with DuPont headers will not fit snugly into a DE-9 connector. For reliability and ease of use it's recommended to use a mating female DE-9 connector when interfacing with the pedals.

Note that the DE-9 connector is often erroneously referred to as DB-9. These are the same thing.

Gas, Brake, and Clutch Pedals Pinout

Most Logitech wheels come with a combined pedal unit with a gas, brake, and clutch pedal. This connects to the wheel using a male DE-9 connector.

Function	DE-9 Pin	Wire Color	Necessary	Recommended Pin
Ground	1	Black	X	GND
Gas Pedal Wiper	2	Orange	X	A2
Brake Pedal Wiper	3	White	X	A1
Clutch Pedal Wiper	4	Green	X	A0
No Connection	5	-	-	-
Power	6	Red	X¹	-
No Connection	7	-	-	-
No Connection	8	-	-	-
Power	9	Red	X¹	VCC²

^{1. Both power pins are identical. Only one needs to be connected (9 is recommended). The other can be used for a detection circuit in combination with a pull-down resistor.}
^{2. VCC is the logic level voltage of your microcontroller. On most Arduinos this is the 5V pin.}

The pedal electronics are compatible up to at least 5V. Higher voltages may be possible but have not been tested.

Gas + Brake Pedals Pinout

Inexpensive Logitech wheels such as the older "Driving Force GT" wheel come with a combined pedal unit with a gas and brake pedal. This connects to the wheel using a male DE-9 connector with pins 1 and 5 removed.

Function	DE-9 Pin	Wire Color	Necessary	Recommended Pin
No Connection	1	-	-	-
Gas Pedal Wiper	2	White	X³	A2
Brake Pedal Wiper	3	Green	X³	A1
Power	4	Red	X¹	-
No Connection	5	-	-	-
Ground	6	Black	X	GND
Gas Pedal Wiper	7	White	X³	-
Brake Pedal Wiper	8	Green	X³	-
Power	9	Red	X¹	VCC²

^{1. Both power pins are identical. Only one needs to be connected (9 is recommended). The other can be used for a detection circuit in combination with a pull-down resistor.}
^{2. VCC is the logic level voltage of your microcontroller. On most Arduinos this is the 5V pin.}
^{3. The wiper connections are duplicated across two sets of pins. Only one group of these pins needs to be connected.}

The pedal electronics are compatible up to at least 5V. Higher voltages may be possible but have not been tested.