Thread: Laptop Touchpad to PS2

Most likely it already IS PS/2. The trick then is figuring out what the pinout on it is, and make a connector.

You should first see if you can find the info on the web. If you can't you might be able to figure out some pins, like power and ground, just by looking at the PCB, and simply try the data and clock in different combinations. That's what I did for a touchpad for which I couldn't find the pinout.

Ive managed to get the wire soldered to the touchpad flat cable. Tricky to say the least with a couple of burnt finger tips But im getting there slowly but surely.

I still am unable to find a pin out diagram anywhere, even the synoptics site is no use.

i want to do this as well. I found a tutorial on the web a while back. Cant seem to find it now. BUT, i was wondering, would we need specific drivers? Also how would we perform calibration and such?

Right i've checked my PS2 cable and it has the following wires attached

(S2 Connection at back of Computer)
||
||
______________||____________
| | | | |
White Blue Red Yellow Black
+5 ? +5 ? -ve

I also have five wires coming from my Touchpad, anyone have a notion how i would go about attaching these to the above connections?

PS/2 has 6 pins. They are:

1: data
2: reserved
3: ground
4: +5V
5: clock
6: reserved

Your device might use the reserved pins, but you can safely ignore them and it'll still work fine. That leaves you with 4 pins you have to connect.

On the PC MB port, the pinout looks like:

_6__|__5

4_______3

__2__1

(sorry for the underscores, this blasted thing removes whitespace)

Now, your problem is you don't know the pinout on your touchpad. If you can't find it, your only real recourse is trial and error. What I did was solder connectors on all of the pins, so I can try different combinations quickly.

Some educated guessing can save you alot of trouble. Ground is probably the easiest to figure out by looking at the PCB, since many things tend to go to it. It's also the one you want to have right to make sure you don't damage anything - because the other pins operate at 5V, confusing them with power is probably ok, but who knows what reversing the voltage is going to do.

Tred: you don't need specific drivers for PS/2, though some devices might have special features that require them. Even then, it'll work fine as a generic device with the OS's built in drivers.

nice, im gonna mess around with this today...

http://www.synaptics.com/decaf/utilities/ACF126.pdf


I also had a sparepart laptop and I ripped the touchpad for better use, that ofcourse is to put it in my Nissan.

LOL so the link takes you to interfacing guide.