Project 3
Motor Controlled Sounds & Light
Build the circuit shown on the left by placing
all the parts with a black
1
next to them on
the board first. Then, place parts marked
with a
2
, and then parts with a
3
. Install two
(2) “AA” batteries (not included) into the
battery holder (B1) if you have not done so
already. If desired, place the egg on the
color LED (D8).
Turn on the slide switch (S1). The color
LED lights and you hear a siren for a few
seconds, then they stop. Spin the motor
(M1) top with your fingers to re-start the
sound and LED. Also, push the press
switch (S2) to light the lamp (L1).
You can change the siren sound by shining
a bright light on the phototransistor (Q4), or
covering it if the room light was already
bright.
Placement Level Numbers
Optional:
+
Project 4
Light Controlled Color Light
+
Turn on the slide switch (S1). Vary the
amount of light shining on the
phototransistor (Q4) to change the
brightness of the color LED (D8).
The phototransistor (Q4) uses
light to control electric current.
Parts like this are used in a
number of ways that affect our
lives. For example, you may have
streetlights in your neighborhood
that turn on when it starts getting
dark and turn off in the morning.
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