Using Mouse as rotation sensors
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Subject Author Date
Using Mouse as rotation sensors Luca Bertoncello 10-25-2005
Posted by Luca Bertoncello on October 25, 2005, 5:55 am
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Hi, all!

I want to use a mouse to have 3 rotation sensor for a robot.
No problem to read X and Y axes and the buttons, but I can't read the
"wheel", that I want to use as third sensor (I need 3 rotation sensors...).

I didn't found any description of the protocol of a wheel Mouse (Z-axis).

Can anyone say how can I read this value?

Thanks a lot in advance!
Luca Bertoncello
(lucabert@lucabert.de)

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Posted by Anthony Fremont on October 25, 2005, 6:43 am
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> Hi, all!
>
> I want to use a mouse to have 3 rotation sensor for a robot.
> No problem to read X and Y axes and the buttons, but I can't read the
> "wheel", that I want to use as third sensor (I need 3 rotation
sensors...).
>
> I didn't found any description of the protocol of a wheel Mouse
(Z-axis).
>
> Can anyone say how can I read this value?

The wheel is actually 3 buttons. One for each direction, plus one for
pushing down. It is not like the X-Y encoders.


Posted by Luca Bertoncello on October 25, 2005, 7:12 am
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Anthony Fremont ha scritto:

> The wheel is actually 3 buttons. One for each direction, plus one for
> pushing down. It is not like the X-Y encoders.

Ach!

Then I just have to check which "button" is checked?

But it seems not so to work...
I get always the first byte as "8"...

What do I do false?

Thanks (and sorry for my english...)
Luca Bertoncello
(lucabert@lucabert.de)

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Posted by Anthony Fremont on October 25, 2005, 11:31 am
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> Anthony Fremont ha scritto:
>
> > The wheel is actually 3 buttons. One for each direction, plus one
for
> > pushing down. It is not like the X-Y encoders.
>
> Ach!
>
> Then I just have to check which "button" is checked?
>
> But it seems not so to work...
> I get always the first byte as "8"...
>
> What do I do false?

The wheel-mouse protocol (MS Intellimouse) uses a 4 byte packet. Since
this is not compatible with the 3 byte ps/2 format, the mouse powers on
in ps/2 compatibility mode. In order to detect the wheel and extra
buttons, you have to tell the mouse to switch modes. BTW, I was wrong
(partly). The wheel can be reported as a Z axis (like the X and Y
movements) or as a set of extra buttons. It's your choice. It's all
right here:

http://www.computer-engineering.org/ps2mouse/


Posted by Luca Bertoncello on October 25, 2005, 12:02 pm
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Anthony Fremont ha scritto:

> The wheel-mouse protocol (MS Intellimouse) uses a 4 byte packet. Since
> this is not compatible with the 3 byte ps/2 format, the mouse powers on
> in ps/2 compatibility mode. In order to detect the wheel and extra
> buttons, you have to tell the mouse to switch modes. BTW, I was wrong
> (partly). The wheel can be reported as a Z axis (like the X and Y
> movements) or as a set of extra buttons. It's your choice. It's all
> right here:

This is not the solution...
The fourth byte is always equal to the first...

I can't understand...

Thanks
Luca Bertoncello
(lucabert@lucabert.de)

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