Elenco Motion Detector User Manual

WARNING: Always check your wiring before

urning o n a c ircuit. Never leave a ci rcuit

t
unatte nded while the batteries are i nstalle d.

ever connect additional batteries or any other

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power sources to your circuits.

Motion Detector

Model SCP-13

ARNING: SHOCK HAZARD -

W

Never connect Snap Circuits
to the electrical outlets in your

ome in any way!

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®

Project 1 Motion Detector

+

This circuit is
pictured on the
front of the box,
use that picture to
help in building it.

Placement

Level Numbers

Snap Circuits®uses electronic blocks that snap onto a base grid to build different
circuits. These blocks have different colors and numbers on them so that you can
easily identify them. Build the circuit shown by placing all the parts with a black 1
next to them on the clear base grid first. Then, assemble parts marked with a 2.
Then, assemble the part marked with a 3. Install three (3) “AA” batteries (not
included) into the battery holder (B3). Place the base grid into the blue stand (with
either the battery holder or the NPN transistor (Q2) closest to the stand) and
carefully stand it up. Position it near the edge of a table, facing across a room.

Turn on the slide switch (S1). The color LED (D8) lights and the horn (W1) sounds
for a few seconds on start-up, and then whenever the circuit detects motion in the
room.

This circuit will work in the dark, but be careful not to hurt yourself moving around
a room in the dark.

Project 2 Silent or Noisy Motion Detector

Use the circuit from project 1,
but remove the horn (W1). The
circuit works the same, except
no longer makes any noise. If
desired, try placing the egg on
the color LED (D8), but it may
not fit tightly enough to stay on
when the circuit is placed in the
blue stand.

Next, replace the color LED
(D8) with the horn. Now the
circuit makes noise but not light.

Egg

(place on

color LED)

Objects that generate heat, including people and
animals, also produce infrared radiation. Infrared
radiation cannot be seen wth our eyes, but can be
detected.

The motion detector (U7) is designed to detect
changes in infrared radiation, especially the type
emitted by people. The NPN transistor (Q2) acts as
an amplifier, helping the motion detector turn on the
color LED and horn.

Project 3 Low Power Motion Detector

Place the base grid into the blue
stand (with either the battery
holder or the 2-snap wire
closest to the stand) and
carefully stand it up. Position it
near the edge of a table, facing
across a room.

Turn on the slide switch (S1).
The color LED (D8) lights for a
few seconds on start-up, and
then whenever the circuit
detects motion in the room.

The color LED will not be as bright
as it was in projects 1 & 2,
because this circuit does not have
the NPN transistor (Q2) as an
amplifier. This circuit uses less
electricity than projects 1 & 2, so
your batteries will last longer.

If you have any problems, contact Elenco

®

Copyright © 2014 Elenco®Electronics, Inc. All Rights Reserved. ● 150 Carpenter Ave. ● Wheeling, IL 60090

[phone] Fax: [phone] ● e-mail: [e-mail] ● Website: www.elenco.com or www.snapcircuits.net

753162

Project 4 Color Light

Project 5

Project 8

Placement Level Numbers

Egg

(place on

color LED)

+

+

Project 7 Low Light & Sound

Build the circuit as shown,
and turn on the slide
switch (S1). The color
LED (D8) is changing
colors in a repeating
pattern. If desired, place
the egg on the color LED.
For best effects, place the
circuit in a dimly lit room.

The color LED is a light emitting diode,
which converts electrical energy into
light; the color of the light emitted
depends on the characteristics of the
material used. The color LED actually
contains separate red, green, and blue
light emitting diodes, with a micro­circuit controlling them. LEDs are more
energy efficient than normal light bulbs.

Use the circuit from project 4, but
replace the color LED (D8) with
the horn (W1, “+” on left). Turn on
the switch (S1) to hear the horn.

The horn converts electricity into
sound by making mechanical
vibrations. These vibrations create
variations in air pressure which
travel across the room. You “hear”
when your ears feel these air
pressure variations.

Project 6 Light & Sound

Turn on the switch (S1) to
see light and hear sound. If
desired, place the egg on
the color LED D8).

Horn

Super Light & Sound

Turn on the switch (S1) to see light and hear the horn (W1). The
horn is synchonized with the changing light from the color LED (D8).

As a variant, try swapping the locations of the color LED & horn.

The tilt switch (S7) is used as a spacer here, and is not electrically
connected.

The NPN transistor (Q2) can be used as an electronic switch, allowing
one circuit to control another.

When the color LED changes colors, the electric current through it also
changes. The NPN transistor uses this changing current to control the
electric current through the horn, which changes the sound it produces.

When you swap the locations of the color LED & horn, the electric
current through the horn is now controlling the electric current through
the color LED. The horn current is not changing like the LED current
was, so now both the horn and color LED just operate normally.

This circuit has the color LED and horn
connected in a series (not in parallel, as in
project 5). This arrangement makes the
LED dimmer and the sound less loud, but
makes the batteries last longer.

Turn on the switch (S1) to see light and
hear a buzzing sound. The buzzing is
synchonized with the changing light.