
and iPhone proximity sensors.
You could also experiment with other types of
transmitters, like different colors/wavelengths of
LED, including nonvisible light such as infrared.
Or try replacing the LED with the Laser Diode
Module Driver on my site (Figure
L
), with a PCB
from oshpark.com/shared_projects/WV8fBzyW.
Here are a few other projects that could
supplement your toolkit:
• Forrest Mims’ Engineer’s Mini Notebook:
Optoelectronics Circuits, originally published
by Radio Shack in 1985, is a classic guide to all
things optical. makezine.com/go/mims-opto
• Craig Heffner’s IRis project is a very sensitive,
high-gain amplifier designed to recei ...