Elenco R/C Snap Rover&reg - Manual (Page 14)

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Project #7
OBJECTIVE: To learn about Morse code.
Build the circuit, connect the jumper wires, and turn
on the slide switch (S1). Turn on the remote control
unit and extend the antenna. Press the buttons on the
remote control to generate long or short bursts of
sound (from the W1 horn) or light (from the D4 LED).
You can send secret messages to friends using Morse
code, which uses a series of long and short bursts of
sound or light to represent letters and numbers. A
short burst is represented by a “
•”, and a long burst
by a “ ⎯”, as shown in this chart:
Morse Code
Morse code was developed in the 19th century to send information over long distances using
telegraph wires and early radios. This equipment had only two states - on or off (that is,
transmitting or not transmitting), and could not send the range of frequencies contained in
human voices or music. The code sent letters as a sequence of short or long transmit bursts.
During World War II Navy ships sometimes communicated by flashing Morse Code messages
between ships using searchlights (they did this because radio transmissions might reveal their
presence or position to the enemy).
You can find more information about Morse code at websites such as
http://en.wikipedia.org/wiki/Morse_code. You can also find websites that will translate and play
back Morse code messages, such as http://www.omnicron.com/~ford/java/NMorse.html.
A • ⎯
B ⎯ • • •
C ⎯ • ⎯ •
D ⎯ • •
E •
F • • ⎯ •
G ⎯ ⎯ •
H • • • •
I • •
J • ⎯ ⎯ ⎯
K ⎯ • ⎯
L • ⎯ • •
M ⎯ ⎯
N ⎯ •
O ⎯ ⎯ ⎯
P • ⎯ ⎯ •
Q ⎯ ⎯ • ⎯
R • ⎯ •
S • • •
T ⎯
U • • ⎯
V • • • ⎯
W • ⎯ ⎯
X ⎯ • • ⎯
Y ⎯ • ⎯ ⎯
Z ⎯ ⎯ • •
1 • ⎯ ⎯ ⎯ ⎯
2 • • ⎯ ⎯ ⎯
3 • • • ⎯ ⎯
4 • • • • ⎯
5 • • • • •
6 ⎯ • • • •
7 ⎯ ⎯ • • •
8 ⎯ ⎯ ⎯ • •
9 ⎯ ⎯ ⎯ ⎯ •
0 ⎯ ⎯ ⎯ ⎯ ⎯
Project #8
OBJECTIVE: To produce electricity by spinning the wheels.
Flip the Rover body so it is upside down and connect the jumper wires
to the body and circuit as shown. Turn off the slide switch (S1) for the
time being.
Spin the right wheels with your hands. Depending on how fast you spin
and in which direction, you may light the LEDs in the car body and the
white LED•(D4), or hear sound from the horn (W1).
Now turn on the slide switch (S1) and spin the right wheels again. The
wheels now take more effort to spin, and cause the left wheels to also spin.
Spinning the right wheels makes all the inter-connected gears spin,
and spins the shaft on the right motor. The spinning motor shaft
creates electricity using magnetism (opposite to how electricity
through the motor spins the shaft), which powers the LEDs and horn.
With the switch on, the electricity created in the right motor also
powers the left motor, which spins the left wheels. The wheels are
harder to spin now because magnetic fields in both motors must be
overcome. No batteries are used.
Generator
Rover rear
(upside down)
!
WARNING: Do not use
excessive force to spin the
wheels at abnormally high
speeds. This may burn out
the motors or LEDs.
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