Data Sheet

65 : circuit 3c
Circuit 3C:
Motion Alarm
Time to take your distance sensor project
to the next level. Let’s imagine you want to
stop your cat from prowling around your
countertop. This circuit uses light, sound
and motion to scare away your cat when it
is detected by the distance sensor. Using a
servo motor, you can add a moving pop-up
to animate your alarm.
NEW CONCEPTS
MECHANISMS: This circuit gets really
fun when you start to use your servo to
animate the world around you. To do
this, you’ll need to connect your servo to
some physical mechanisms. Tape and hot
glue are easy ways to connect things to
your servo. You can also loop a paper clip
through the small holes in the servo arm to
serve as a linkage.
ASSEMBLY
If you have opted for the extra materials,
use the following instructions to create the
moving pop-up for your motion alarm.
. Attach the servo mount of your choice.
The motor mounts also come with screws
to secure the mount to the motor. Once
you are finished with this circuit, you may
choose to add a screw to make for a more
robust mechanism. It is recommended you
upload your code and test the mechanism
before screwing it down.
. Use needle-nose pliers to bend the
paper clip straight. Bend about 1 inch
of the paper clip 90 degrees. Then bend
the other end so it’s about 1/8 inch long.
Repeat this bend once more, making
a hook shape. You should now have a
linkage rod that looks something like this:
YOU
NEED
10k
100k
330
T
VCC
Trig
Echo
GND
TJP16527BH2
1652
R
RGB LED   RESISTORS PIEZO BUZZER  JUMPER WIRES SERVO
TAPE PAPER CLIP NEEDLE-NOSE PLIERS MARKERS/PEN PAPER SCISSORS
(NOT INCLUDED)
DISTANCE SENSOR
Linkage rods are found on many RC
airplanes, which use servo motors to
control the ailerons, elevators and
rudder.
SIK v4 Book Oct 13.indb 65 10/18/17 10:01 AM