This design uses the Arduino Uno. The official Arduino web site (
www.arduino.cc
) lists suppliers
of the Uno. However, if you are on a budget, you can use a clone of the Arduino Uno.
The Arduino is
“open-source hardware,” which means all the design files are available
under a Creative Commons
license that permits third parties to make their own Arduinos. Many do, and an Internet search will find
you cheap alternatives to the official “Uno.”
There are many different types of Bluetooth modules on the market. The module that the author used
is a simple “stick of gum”–shaped Bluetooth module with just four pins coming out of it that supply power
and provide, receive, and transmit connections. These types of modules work at 5V and are ideally suited
for use with an Arduino. They are usually made up of a base board with four pins on which an even
smaller board is mounted that is the actual Bluetooth module. These can
be bought on eBay for around
USD 15. It is best to buy one with the miniboard already soldered to the main board, because the
connections are very tiny and quite hard to solder. Higher-quality and
more expensive versions are
available in the Bluesmirf range from suppliers like Sparkfun. The main difference between the low-cost
and more expensive modules is range.
The gear motors from Pololu are ideal for this kind of application. They have about the right gear
ratio and are not expensive. Alternatives are available, but try not to buy gear motors that draw more than
about 1 amp, otherwise the motor shield will struggle to provide the necessary current.
The motor shield greatly simplifies the whole process of driving motors, and what’s more, it has a
handy little prototyping area at one end where you can attach your own extra components. In this case, that
is where our Bluetooth module will sit.
In the parts list, I specified the basic shield kit, which comes
without header strips and screw terminals. This shield is also available as a “retail” kit that includes the
pin header and screw terminals. See Sparkfun’s web site for details.
In addition to
these components, you will also need the following tools.
TOOLBOX
An electric drill and assorted drill bits
A hacksaw or Dremel rotary tool
A hot glue gun or epoxy glue
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