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<sup>DE9 graphic from [Aeroid](https://commons.wikimedia.org/wiki/User:Aeroid) @ [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:DE9_Diagram.svg#/media/File:DE-9_Female.svg), modified for scale, colors, and creation of a complementary male version. These graphics are licensed under [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/).</sup>
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<sup>DE-9 graphic from [Aeroid](https://commons.wikimedia.org/wiki/User:Aeroid) @ [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:DE9_Diagram.svg#/media/File:DE-9_Female.svg), modified for scale, colors, and creation of a complementary male version. These graphics are licensed under [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/).</sup>
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The Logitech pedals connect to the wheel base units using [a male DE9 connector](https://en.wikipedia.org/wiki/D-subminiature). Note that most jumper wires with [DuPont headers](https://en.wikipedia.org/wiki/Jump_wire) will not fit snugly into a DE9 connector. For reliability and ease of use it's recommended to use a mating female DE9 connector when interfacing with the pedals.
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The Logitech pedals connect to the wheel base units using [a male DE-9 connector](https://en.wikipedia.org/wiki/D-subminiature). Note that most jumper wires with [DuPont headers](https://en.wikipedia.org/wiki/Jump_wire) 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.
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Note that the DE9 connector is often erroneously referred to as DB9. These are the same thing.
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Note that the DE-9 connector is often erroneously referred to as DB-9. These are the same thing.
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## Gas, Brake, and Clutch Pedals Pinout
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Most Logitech wheels come with a combined pedal unit with a gas, brake, and clutch pedal. This connects to the wheel using a male DE9 connector.
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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.
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| Function |DE9 Pin | Wire Color | Necessary | Recommended Pin |
| Power | 9 | Red | X<sup>1</sup> | VCC<sup>2</sup> |
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<sup>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.</sup>
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<sup>2. VCC is the logic level voltage of your microcontroller. On most Arduinos this is the 5V pin.</sup>
@@ -41,19 +41,19 @@ The pedal electronics are compatible up to at least 5V. Higher voltages may be p
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## Gas + Brake Pedals Pinout
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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 DE9 connector with pins 1 and 5 removed.
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| Function |DE9 Pin | Wire Color | Necessary | Recommended Pin |
| Power | 9 | Red | X<sup>1</sup> | VCC<sup>2</sup> |
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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.
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| Function |DE-9 Pin | Wire Color | Necessary | Recommended Pin |
| Power | 9 | Red | X<sup>1</sup> | VCC<sup>2</sup> |
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<sup>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.</sup>
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<sup>2. VCC is the logic level voltage of your microcontroller. On most Arduinos this is the 5V pin.</sup>
<sup>DE9 graphic from [Aeroid](https://commons.wikimedia.org/wiki/User:Aeroid) @ [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:DE9_Diagram.svg#/media/File:DE-9_Female.svg), modified for scale, colors, and creation of a complementary male version. These graphics are licensed under [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/).</sup>
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<sup>DE-9 graphic from [Aeroid](https://commons.wikimedia.org/wiki/User:Aeroid) @ [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:DE9_Diagram.svg#/media/File:DE-9_Female.svg), modified for scale, colors, and creation of a complementary male version. These graphics are licensed under [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/).</sup>
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The Logitech shifter connects to the wheel base units using [a female DE9 connector](https://en.wikipedia.org/wiki/D-subminiature). Note that most jumper wires with [DuPont headers](https://en.wikipedia.org/wiki/Jump_wire) will not fit snugly into a DE9 connector. For reliability and ease of use it's recommended to use a mating male DE9 connector when interfacing with the shifter.
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The Logitech shifter connects to the wheel base units using [a female DE-9 connector](https://en.wikipedia.org/wiki/D-subminiature). Note that most jumper wires with [DuPont headers](https://en.wikipedia.org/wiki/Jump_wire) will not fit snugly into a DE-9 connector. For reliability and ease of use it's recommended to use a mating male DE-9 connector when interfacing with the shifter.
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Note that the DE9 connector is often erroneously referred to as DB9. These are the same thing.
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Note that the DE-9 connector is often erroneously referred to as DB-9. These are the same thing.
| Data Out (SDO) | 2 | 7 | 4 (via buffer) | Gray | X | 2 |
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## EEPROM Storage
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The Logitech shifter has an internal EEPROM chip, presumably for storing settings and calibration data. In my shifter this is an [ST Microelectronics M95010-W](https://www.st.com/resource/en/datasheet/m95010-w.pdf) in an SO8 package. It has 1 Kbit of memory and can be read and written to via the DE9 connector. The EERPOM does not need to be used in order to retrieve the control surface data from the devices.
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The Logitech shifter has an internal EEPROM chip, presumably for storing settings and calibration data. In my shifter this is an [ST Microelectronics M95010-W](https://www.st.com/resource/en/datasheet/m95010-w.pdf) in an SO8 package. It has 1 Kbit of memory and can be read and written to via the DE-9 connector. The EERPOM does not need to be used in order to retrieve the control surface data from the devices.
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This library does not implement EEPROM support, either for reading from the EEPROM or utilizing its data. The remaining two unused pins (SCLK and SDI) are only used for interfacing with the EEPROM.
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