Forums > MaxMSP

accessing phototransistors on the mac book.

December 12, 2007 | 9:26 pm

Hi. I am wondering if and how I can use Max to access the transistor’s in my mac book. I’d like to be able to access the data in the same way that the SMS patch access the accelerometer in the mac book. I’m hoping that I can figure it out on my own by peering into the workings of the SMS patch but if there are any Max masters out there who have any interesting thoughts on the subject pleas let me know.


December 12, 2007 | 11:08 pm

Hi,
look here: http://www.iamas.ac.jp/~aka/max/#aka_booklight

have fun


December 13, 2007 | 6:53 am

Thanks!


December 13, 2007 | 12:49 pm

Since when has the macbook had phototransistors? And why?

On 13/12/2007, Andrew K wrote:
>
>
> Thanks!
>


December 13, 2007 | 5:32 pm

What I meant to say was "Ambient light sensors."
Which I assume is just another way of saying "photo transistors". But maybe not. I probably should have done more research.

Why?

Well, there is a keyboard back light that turns on when you use your macbook in dark places. Also, the ambient light sensor can be used to regulate the brightness of your screen.


December 13, 2007 | 5:55 pm

At 12:49 PM +0000 12/13/07, Joe Bicker wrote:
>Since when has the macbook had phototransistors? And why?

To sense ambient light to know when to turn on the keyboard backlight.

The MacBook Pro had them for a couple generations. I don’t think the non-pro MacBook has them.

-C


Chris Muir | "There are many futures and only one status quo.
cbm@well.com | This is why conservatives mostly agree,
http://www.xfade.com | and radicals always argue." – Brian Eno


December 13, 2007 | 11:45 pm

righteo. I have limited laptop experience, so have never encountered this
feature.
So you’ve got another external sensor to play with? That’s a bonus.
Where is it located?

On 13/12/2007, Chris Muir wrote:
>
> At 12:49 PM +0000 12/13/07, Joe Bicker wrote:
> >Since when has the macbook had phototransistors? And why?
>
> To sense ambient light to know when to turn on the keyboard backlight.
>
> The MacBook Pro had them for a couple generations. I don’t think the
> non-pro MacBook has them.
>
> -C
>
> –
> Chris Muir | "There are many futures and only one status quo.
> cbm@well.com | This is why conservatives mostly agree,
> http://www.xfade.com | and radicals always argue." – Brian Eno
>


December 14, 2007 | 1:13 am

Two actually. One on each side of the keyboard.
The patch posted above has a cute little theremin simulator that only kind of works like a theremin. But with one sensor on each side of the keyboard…well…you get the idea.

Before I made this post I found a program called ShadowBook that uses the transistors as an adjustable trigger for other silly programs.

Here is a link.

http://blog.medallia.com/2006/06/shadowbook.html


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