25
Project 119
This simple circuit can be used for communication. Press the press
switch (S2) in long and short bursts to make a pattern of light ashes
representing the dots and dashes shown in the Morse Code table below.
You can use Morse Code and this circuit to send secret messages to
some friends in the room without others knowing what you’re saying.
If you have a strong ashlight or searchlight then you can send
messages to friends far away at night. During World War II Navy ships
sometimes communicated by ashing Morse Code messages between
ships using searchlights (because radio transmissions might reveal
their presence to the enemy).
Years ago, some civilizations would send messages to other tribes
using smoke signals and a special code.
Morse Code
Morse Code: The forerunner of
today’s telephone system was the
telegraph, which was widely used in the
latter half of the 19th century. It only had
two states - on or o (that is, transmitting
or not transmitting), and could not send
the range of frequencies contained in
human voices or music. A code was
developed to send information over
long distances using this system and
a sequence of dots and dashes (short
or long transmit bursts). It was named
Morse Code after its inventor. It was
also used extensively in the early days
of radio communications, though not in
wide use today. It is sometimes referred
to in Hollywood movies.
A
. _
N
_ .
Period
. _ . _ . _
B
_ . . .
O
_ _ _
Comma
_ _ . _ _
C
_ . _ .
P
. _ _ .
Question
. . _ _ . .
D
_ . .
Q
_ _ . _
1
. _ _ _ _
E
.
R
. _ .
2
. . _ _ _
F
. . _ .
S
. . .
3
. . . _ _
G
_ _ .
T
_
4
. . . . _
H
. . . .
U
. . _
5
. . . . .
I
. .
V
. . . _
6
_ . . . .
J
. _ _ _
W
. _ _
7
_ _ . . .
K
_ . _
X
_ . . _
8
_ _ _ . .
L
. _ . .
Y
_ . _ _
9
_ _ _ _ .
M
_ _
Z
_ _ . .
0
_ _ _ _ _
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