Cloning A Remote - Arduino Uno Quick Start Manual

Cloning a Remote

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remote, it will send the same code over and over again as long as you press
the key. An Apple remote will send the key s command code only once, and
after that it sends the code 0xffffffff as long as you press the key.
Figure 30 Capture the IR codes of a Samsung remote
After you ve grabbed a remote s control codes, you can use them to build your
own remote. You ll learn how to do that in the next section.
Cloning a Remote
As soon as you know the protocol and the
command codes a remote uses, you can
clone it. You need only an infrared LED
that doesn t differ much from the LEDs
we ve used before. The only difference is
that it emits "invisible" light. The figure
shows how to connect it to pin 3 of an
Arduino. (The library we re using in this
section expects the infrared LED to be
connected to pin 3.) Note that you can t
use an LED without a resistor. (See Cur-
rent, Voltage, and Resistance, on page 239,
to learn more about it.)
We could try to generate the infrared sig-
nals ourselves, but that d be tedious and
error-prone. It s better to use the existing
implementation in the IRremote library.
We ll use it to create our own TvRemote
class that encapsulates all of the gory protocol details. Here s the class:
www.it-ebooks.info
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