Elenco Snap Circuits Motion - Manual (Page 42)

Project 64 Audio Triple Detector
This circuit could be used as a security
system. It lights if it detects someone
moving across the room, and sounds
an alarm if someone tries to move the
circuit out of their path.
Assemble the circuit and place the base grid into the blue stand (with
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). An alarm sounds for a few seconds on
start-up, and then whenever the circuit detects motion, detects vibration,
or is tilted in some directions.
This circuit will work in the dark, but be careful not to hurt yourself
moving around a room in the dark.
Project 65 Vibration Plane
Note: This circuit has the
red/yellow bicolor LED
(D10) connected directly
across the batteries without
another component to limit
the current. Normally this
might damage the LED,
however Snap Circuits ®
LEDs have internal
protection resistors to
protect them from incorrect
wiring, and will not be
damaged.
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Mount circuit on the blue stand and face across a room.
Assemble the airplane using the instructions on
page 5, install the light motor (M7) into the front
of it, then connect the other part to it (while it is
mounted on the airplane), as shown. Spread
out the jumper wires and be sure they will not
interfere with the fan on the light motor.
Place the airplane on a smooth surface and turn
on the slide switch (S1). The fan on the light
motor spins and lights, and the airplane slowly
moves around due to vibration. The red/yellow
bicolor LED (D10) also lights red, because it is
connected in series with the vibration switch
(S4), which is triggered by the vibrations.
Now take the airplane off the table and hold it in the
air, or place it on carpet. The red/yellow may not
light now because the vibrations are cushioned, and
may not be enough to trigger the vibration switch.
!
WARNING: Moving parts. Do not
touch the fan during operation.
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