Hi piclist. I'm working on a robotics project and I want to know how to
use a Vishay TFDU4300 Infra red transceiver module for part of a motor
encoder. The module has what looks like two black hemi-spheres mounted on a
chip (transmitter and receiver). I can't tell from the data sheet: will the
IR wave from the transmitter bounce off of a plate (encoder disk) in front
of and parallel to the chip and reach the receiver?
    I also need to put this onto a PCB project that will be replicated. It
seems unstable to try to put this chip on a PCB board and then mount that
next to a motor. Does anyone know of a better way to design a motor encoder
that won't get damaged by the motor? I've tried a design using a high
brightness LED sending light to a photo detector sending a voltage to a
comparator with an offset, but that seems to complicated and I still have
the problem of how to mount a PCB board next to a moving machine. Thanks.

--Zach
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