[Noisebridge-discuss] Technical question: Directionally sensitive photosensors

[Christoph Maier]

On Mon, Jun 10, 2013 at 2:54 PM,  <pdbogen at cernu.us> wrote:
> On Mon, Jun 10, 2013 at 02:51:48PM -0700, Christoph Maier wrote:
>> Can anyone on this list give me recommendations (nudge,nugde, Mitch
>> Altman) how to build cheap photosensors (wink,wink, Jonathan Foote)
>> that are highly directionally sensitive?
>
> What sort of sensing do you need? A photoresistor at the end of a bit of
> opaque tubing is highly directional..

Something small and cheap ... Photoresistors and opaque tubing may
already be bulky if placed on a nickel-sized PCB ...