help figure out this wiring?

[tony.silveira]

hey all,

i tried to do some wiring on my wheel attachment but can't figure this out.  below is a pic of the board inside the MS precision wheel.  the wheel has 8 buttons and only 6 wires.  i'm figuring the wiring is on some kind of matrix but i'm not smart enough to figure this out.  can anyone figure out the below or point me in some direction?

if i can't figure it out, i'll just solder onto the button points themselves but i would like to try and use the existing wiring

[PL1]

Tony,

Pretty sure that you have a 2 x 4 matrix with diodes.

The six dots across the top correspond with the row of pins below them.

The red and yellow dots are on one axis and the other 4 are on the other axis.

The black chips located middle right are labeled D10 and D11 (D=diode) and there appears to be a matching pair on the left.

Pretty sure that each of these black chips contain 2 diodes based on how they straddle the traces.


Scott

[tony.silveira]

i appreciate the response scott, thank you.

is there anyway to get this to work with just wiring or will i need something to decode the matrix which is probably way beyond me.

lets take the far left button as an example, the one you put yellow and green on.  obviously, just wiring up the yellow and green to a button doesn't work so there must be something i'm missing.

if it gets overly complicated, i'll just wire up directly to the solder pints and cut the leads that go t the current wiring harness.

apologies if i'm bone headed, matrixes always give me a headache.   

[PL1]

1. Connect the yellow and red dot wires to your encoder ground.

2. Connect the green dot wire to an encoder input.

3. Press the button for green and yellow dot.

4. If the encoder sends an output, press the button for green and red dot.

If both worked, you can perform this mod to get all 8 buttons working:
(Yellow side uses all original wiring, red side uses original ground traces.)

- Jumper the red dot wire to the yellow dot wire and connect to the encoder's ground. (already done)
- Wire blue, gray, orange, and green dot wires to four encoder inputs.
- On the red side, cut the blue, gray, orange, and green dot traces between the top header and the switches.
- Solder a wire on the switch side of each of the four traces you cut.
- Connect those four wires to four separate encoder inputs and you should be good to go.


Scott