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100 October 2007
I work in a hot, one man fabrication shop. I have a furnace type squirrel
cage fan blowing at my workbench to
cool me down. I'd like to have the fan
on a turn table and rotate toward me
no matter where I go in the shop. I'd
have to wear a transmitter or sensor of
some sort. I guess there'd be a stepper
motor in there somewhere, too.
Azimuth tracking comes to mind. Is
there anything out there like that?
#10071 Rod Reynolds
I am looking for a high brightness
LED with a peak wavelength around
680 nm. Is there anything similar to the
offerings from Cree, Seoul, Philips, etc.?
#10072 Benjamin Butler
I often drive my motorcycle late at
night while traffic is light. There are
many traffic signals where the vehicle
detection device doesn't see my bike
because there is not enough iron in it to
trigger the inductive loop. I have to
either run the light or turn right on red.
Is there a circuit capable of generating a signal that could trigger the
inductive loop detector? It needs to be
12 volts and ideally low powered so
that I can wire it directly into the brake
light. This will also give me the ability to
pulse the circuit if necessary.
Permanent magnets don't work. I
even went so far as to put a row of very
strong magnets on the kickstand. I then
put the kickstand down directly on the
grooves in the pavement where the
inductive loop was buried. It never
detected my 500 pound Honda.
#10073 Joe Schram
I have been using the serial port of
my PC and languages such as assembly,
C++, Java, and VB to communicate
with custom designed circuits.
Nowadays, all PCs have replaced
the serial port with multiple USB
ports. I want to migrate my applications
but have found working with USB
rather difficult. Could someone please
suggest a way to send/receive a simple
1-0 digital signal using any programming language (preferably Java)?
#10074 Sahand N.
I have an irrigation system with a
HARDY RainDial, six zone controller,
by Irritrol. It has only four wires plus a
ground going to it and the valve box. It
would be impossible to run new or
additional wire as the wiring goes
under a concrete floor.
Four zones are being used. I
recently added a fifth battery-operated
zone, but it’s a problem as the