Elenco Snap Circuits Motion - Manual (Page 53)

Build the circuit and turn on the slide switch (S1).
A light comes on if the circuit is moved, or tilted in
some directions. The light stays on for a while
after the tilt is removed. The lever on the
adjustable resistor (RV2) controls the maximum
light brightness and how long the light stays on
after tilt is removed; the brighter the light, the
faster it shuts off.
If the circuit does not shut off when left alone on
a flat surface, then tilt it slightly so it turns off.
Remove the 3-snap wire between points A & C, and
connect the red jumper wire between points A & B.
Now the alarm is activated by different tilt angles.
If you keep in the 3-snap wire between points B
& C and connect the red jumper wire between
points A & B, then the circuit will be so sensitive
to tilt that the alarm may be difficult to shut off.
Project 93 Adjustable Slow Off Tilt Light
Modify the preceding circuit to
be this one. Turn on the slide
switch (S1). A light comes on
if the circuit is moved, or tilted
in some directions. The light
stays on for a while after the
tilt is removed. The lever on
the adjustable resistor (RV2)
controls how long the light
stays on after tilt is removed.
If the circuit does not shut off
when left alone on a flat surface,
then tilt it slightly so it turns off.
Remove the 3-snap wire between
points A & C, and connect the red
jumper wire between points A &
B. Now the alarm is activated by
different tilt angles.
Project 96 Bright Slow Off Tilt Light Project 94
Color Slow Off Tilt Light
Use the preceding circuit but replace the red/yellow
bicolor LED (D10) with the color LED (D8, “+” on top).
You can also keep the red/yellow bicolor LED in the
circuit but reverse its orientation, so it makes yellow light.
Project 95
Very Slow Off Tilt Light
Use the preceding circuit with either the D8 or D10
LEDs, but replace the 1mF capacitor (C7) with the
larger 100mF capacitor (C4). The circuit works the
same but the larger capacitor will keep the LED on
longer. Set RV2 to the left side or the LED may seem
to stay on too long.
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When tilt is detected, the 1mF
capacitor (C7) is charged through
the tilt switch (S7). When tilt is
removed, the capacitor discharges
through the resistors in the pivot
stand and RV2, and through the
NPN transistor (Q2). The light
stays on as the capacitor
discharges. RV2 also limits the
current through the LED (D10),
and so affects the LED brightness.
You can make the light shut off
faster after tilt is removed by
disconnecting C7, or by
connecting the black jumper wire
across the pivot stand.
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