basin of dyed water into a two quart soda bottle to save
Operating the Waterworks
Once you get everything built, it’s time to have some
fun! You don’t need to operate the Freeze Fountain in
a completely dark room which is helpful as you learn
First adjust the pump speed to obtain a steady
dripping. Once that is stable, adjust the strobe rate for
some neat effects like freezing a droplet in mid-air or even
giving it the appearance of moving upward! Splashes are
also fun to visualize on the surface of the water as well as
objects inserted into the catch basin.
This project has a little of everything in it! My design
was intended to teach you how to craft a reprogrammable
■ FIGURE 9. I’ll wear
gloves next time.
system that can be
easily adapted to
tolerances. I also like
devices that have
adjustments and outputs with a myriad of combinations. This is a good project
to build with your kids and pull out at family gatherings to
stimulate a discussion of science. Just don’t blame me if
you end up with fluorescent fingers (Figure 9)! NV
If you build a freeze fountain, be sure to send a video clip or
photos of your setup to email@example.com to share with other readers on our website. Playing with the controls and inserting
objects into the drip stream can make some interesting effects.
Dan Danknick is a firmware engineer in southern CA and
former technical editor of this magazine. He welcomes your
comments and can be reached via firstname.lastname@example.org.
WE HAVE THE ELEC TRONIC COMPONEN TS
YOU ARE LOOKING FOR AT DISCOUNT PRICES
AM/FM Broadcasters • Hobby Kits
Learnng Kits • Test Equipment
...AND LOTS OF NEAT STUFF!
May 2008 57