On 30.08.2011, at 01:38, Richard Smith wrote: > On Mon, Aug 29, 2011 at 1:06 PM, Bert Freudenberg <b...@freudenbergs.de> > wrote: >> On 17.08.2011, at 17:24, Martin Langhoff wrote: >>> Saadia Baloch (4): >>> Driver to read Outdoor Light Sensor from EC on OLPC. >> >> So this is exposed at >> >> /sys/devices/platform/olpc-ols.0/power_state >> >> And it seems to sit "behind" the blinking left-most LED? And the blink rate >> is proportional to the light sensed? Why? > > Its proportional because that's how the sensor works. The amount of > light changes the time to bleed off the charge stored in the diode > when you reverse bias it.
Ah, so you use the LED itself to sense light? And then time how long a cycle takes in the EC? Awesome design! This almost takes the cake over the analog mic hack. - Bert - _______________________________________________ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
