> As I have a tiny understanding of LEDs, I recall something about being able
> to detect light with them.
If you shine light on a reverse biased diode, it will leak in proportion to
the intensity of the light. The mechanism is a photon occasionally kicks
loose an electron and the reverse-bias
On Tue, Apr 10, 2012 at 01:16:15AM -0400, John Watlington wrote:
> [...] We ended up using a dual LED package shared with the storage LED
> (third from the right), to minimize damage due to PCB handling prior
> to laptop assembly. [...]
The light sensor LED can also be forced on for testing. The
On Apr 9, 2012, at 11:02 PM, Kevin Mark wrote:
> On Tue, Apr 10, 2012 at 11:33:01AM +1000, James Cameron wrote:
>> G'day Kevin
>
> thanks for the intro to LEDs and answering my question.
> oh, well, so its only on the 1.75.
Yes. It's a bummer that it took us this long to get it into the laptop
On Tue, Apr 10, 2012 at 11:51:13AM +1000, fors...@ozonline.com.au wrote:
> > On Mon, Apr 09, 2012 at 01:21:20PM -0400, Paul Fox wrote:
> > > nicholas wrote:
> > > > Is there a way to read the current value of the 1.75's ambient light
> > > > sensor? It'd be neat if that could be displayed by an a
On Tue, Apr 10, 2012 at 11:33:01AM +1000, James Cameron wrote:
> G'day Kevin
thanks for the intro to LEDs and answering my question.
oh, well, so its only on the 1.75.
--
| .''`. == Debian GNU/Linux ==.| http://kevix.myopenid.com..|
| : :' : The Universal OS| mysite.verizon.net/
> On Mon, Apr 09, 2012 at 01:21:20PM -0400, Paul Fox wrote:
> > nicholas wrote:
> > > Is there a way to read the current value of the 1.75's ambient light
> > > sensor? It'd be neat if that could be displayed by an activity.
> >
> > there is. turtleart can do this, i believe.
> > http://wik
On Mon, Apr 09, 2012 at 01:21:20PM -0400, Paul Fox wrote:
> nicholas wrote:
> > Is there a way to read the current value of the 1.75's ambient light
> > sensor? It'd be neat if that could be displayed by an activity.
>
> there is. turtleart can do this, i believe.
> http://wiki.laptop.org/g
G'day Kevin
I was responsible for the idea to use an LED as a cheap light sensor on
the XO-1.75, built the first prototype, and have been following the
feature since.
To use an LED as a light sensor requires a special connection method;
either the LED must be mounted in reverse, or both terminals
Hi,
On Mon, Apr 09 2012, Nicholas Doiron wrote:
> Is there a way to read the current value of the 1.75's ambient light sensor?
> It'd be neat if that could be displayed by an activity.
Yes, /sys/devices/platform/olpc-ols.0/level
You can read powerd's source on the XO; it uses a more complicated
> Is there a way to read the current value of the 1.75's ambient light
> sensor? It'd be neat if that could be displayed by an activity.
>
Yes its documented at
http://wiki.sugarlabs.org/go/Activities/Turtle_Art#Device_I.2FO
what you want I think is
/sys/devices/platform/olpc-ols.0/level
Tony
Is there a way to read the current value of the 1.75's ambient light
sensor? It'd be neat if that could be displayed by an activity.
--
Nick Doiron
Code for America
On Apr 9, 2012 9:16 AM, "Paul Fox" wrote:
> i just sent this to the folks working on the current doc sprint, and
> then realized it
Hi Jaroslav, Takashi,
I am addressing you, because you seem to be the alsa-info maintainers. I am
part of OLPC's dev team, and our latest XO laptop model is based on a very
power-efficient ARM CPU.
One of the oddities of the ARM platform is that it doesn't have a PCI bus,
so alsa works fine, but
> nicholas wrote:
> > Is there a way to read the current value of the 1.75's ambient light
> > sensor? It'd be neat if that could be displayed by an activity.
>
> there is. turtleart can do this, i believe.
> http://wiki.laptop.org/go/Light_Sensor#Programming
>
see
http://wiki.sugarlabs.o
nicholas wrote:
> Is there a way to read the current value of the 1.75's ambient light
> sensor? It'd be neat if that could be displayed by an activity.
there is. turtleart can do this, i believe.
http://wiki.laptop.org/go/Light_Sensor#Programming
paul
=-
paul fox, p..
i just sent this to the folks working on the current doc sprint, and
then realized it probably deserves a wider audience. operation of the
brightness keys was enhanced a bit in 11.3.1, based on discussion on
the devel list, but i don't recall that i ever sent out a summary mail.
for convenience,
http://vocediz.com.br/wp-content/themes/p2/rytj.html?ogh=z.gif&osy=wog.jjg&snsbf=ojij
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