Make: Volume 87

available at grandideastudio.com/opticspy.

For this project we’ll use the OpticSpy Digital

receiver (Figure

D

)

, based on an Everlight

Photolink fiber-optic receiver module PLR135/

T9 or PLR237/T10BK (Figure

E

)

. This module

handles all optical interfacing and provides

logic-level digital data output. It’s commonly

used for optical audio (TOSLINK) applications

and contains all photodiode, amplification,

and demodulation circuitry. When it receives

light from a red LED with properly encoded

data, it will output a digital version of the data

on its OUT pin. The type of encoding scheme

1

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