Light sensor on XO-1.75

Paul Fox pgf at
Fri Sep 2 10:07:54 EDT 2011

sascha wrote:
 > > yes, it's a nice trick.  i think it was discussed on this list last year.
 > > it's not very sensitive, but it can tell us the difference between full
 > > sun and not, which is really when we'd want to turn off the backlight.
 > Given that turning off the backlight usually isn't time critical, how
 > about triggering a measurement cycle only when user space actually reads
 > from the sysfs file? That would disturb regular operation of the nearby
 > LED only occasionally.

yeah, we'll figure out something like that.  work in progress.

 paul fox, pgf at

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