SP_Adapter

Logitech G25/G27 shifter/pedals adapter to use as standalone device

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20/20 lines (23 parts)

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20/20 lines (23 parts)

19/20 lines (22 parts)

References	Qty	Description	MPN	Digikey	Mouser	RS	Newark	Farnell
25/27	1		90131-0123	WM8121-ND	538901310123	6703443	60H4442	2381222
BOOT0	1		90131-0122	WM8120-ND	538901310122	6703449	25M5898	1756986
C1-C2	2	22pF,0603	C0603C220J1GACTU	399-7874-2-ND	80C0603C220J1G	8015350	75R1532	1813429
C3-C4	2	100nF,0603	C0603C104K5RACTU	399-5089-2-ND	80C0603C104K5R	8015347	72J5992	1692286
C5	1	4.7uF,0603	CL10A475KL8NRNC	1276-6794-6-ND	81GRM188R60J475ME9D	6911155	62W5999	2211163
C6	1	10nF,0603	C0603C103J5JAC7867	399-13384-1-ND	810C1608X7R1H103K	7882988	45Y5166	2470427
C7	1	1uF,0603	GRM188R61H105KAALD	490-10732-6-ND	81GRM188R61H105KALD	8467300	13T1194	1845736

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shifter adapter

The idea behind this project is to create open and inexpensive USB HID adapter for Logitech G25 / G27 pedals and shifters based on affordable components. Once you bought (or built) your new shiny and awesome direct drive steering wheel you no longer need your old but still working Logitech wheel. But it parts still can be used as standalone device.

I am aware that some shops already sell similar adapters. Unfortunately these devices are quite expensive and not open source. Also I want to practice a bit with STM32 programming :)

Hardware part is based on STM32F042 microcontroller(TSSOP20), Schematics folder contains Gerber files as well as DipTrace source files.

"Stable" firmware for board revisions 1.0 and 1.1:

hse-2.07.dfu

hse-2.07.hex

Firmware for STM32F103C8T6 "Blue Pill" development board:

bluepill-2.07.hex

Firmware update

Disconnect the device and open the case.
Place jumper BOOT0 to right position (assuming you're holding the board with USB connector down and DB9 connectors left and right. Normal position of BOOT0 jumper is left side).
Install STM DfuSe, download it here: https://goo.gl/JMUFBS (free registration required). Alternatively install it from my Google Drive: https://goo.gl/dp4XGH
Connect the board to computer, it should be detected as "STM device in DFU mode"
Download firmware .dfu file.
Run DfuSe, mark Verify checkbox, press Choose button, select firmware image, then press Upgrade, agree to the warning message.
When Progress bar turns blue firmware update is complete, disconnect the board, move jumper BOOT0 back to the left position, close the case, connect it to computer, the board should be detected as "Shifter/Pedals Adapter". Firmware update complete!

Calibration software (Windows x86):

SP_Profiler_1.2.exe

Calibration procedure

Download and run SP_Profiler.exe.
The board should be detected as HID-device in the drop down menu, and red cross should be visible in the calibration area.
Press Read button, the blue lines should be visible.
The idea of shifter calibration is to match actual shifter X an Y potentiometer positions to gear detection zones, see illustration: You can move blue lines by altering numbers in corresponding edit fields, hit Update button after each edit. Then check if shifter positions are detected correctly. Once you satisfied how shifter detects selected gear press Update and close SP_Profiler, values are stored in adapter flash memory.

Obtaining the board

PCB is available to order on kitnic.it. I'm testing data for 1clickBOM Chrome plugin to order all parts from major component suppliers (Digikey, Mouser, RS, Newark, Farnell). I'm also selling a small amount of the boards assembled manually by myself, contact me if you want one.

USB VID/PID

The board uses VID 0x1209 (InterBiometrics) / PID 0xF00D to identify itself, see pid.codes database.

License

This project is licensed under the BSD License - see the LICENSE file for details

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