I decided to upgrade my G27 shifter. I’m not using it with a G27 wheel, so it’s possible to do a few things with it. The shift registers inside the stick are configured for 16 buttons; the 4 red, the 4 black in the top quad, the Dpad counts as 4 and the reverse pushdown takes one, that leaves 3 buttons that can be counted, but are not present. I was never able to trace one of them out, so I was only able to add 2 buttons to my stick.
Heres the button I’m gonna put in. Its the horn button left over from my custom wheel mod.
I made a hole! actually, It was bigger than it was supposed to be so I had to cut even more. It’s flush mount instead of being proud of the surface like I had wanted.
A bit of a gap, but not too terribly noticeable. I’ll make some ABS cement later to fill it, but the hot glue on the backside is doing a decent job.
Here is the circuit board, note the unpopulated J12 connector location. This is where the large button connector will go. On the G25, this is where the mode switch connects. I went ahead and drilled a hole in the face for the mode LED to poke through, and added that as well. It doesn’t have any real functionality apart from blinky lights when you press the button.
The bottom of R109 and the lower pad of R76 on the far left (white wire) are the connection points for the other button. The black connector was added. It has 3 pin in it, but only 2 are connected; I’m fresh out of 2 pin connectors.
Everything fits nicely.
And here it is all reassembled. Not too bad, I don’t think. I’m thinking of using these as Engine Start/Nitrous buttons.