[whoosh] [ding] Hi this is Ben Finio from
Science Buddies and this video will show you how to build a bristlebot, a tiny vibrating
robot built on the head of a toothbrush. To build your bristlebot, you will need a coin
cell battery and vibration motor supplied in your science buddies bristlebot kit. You
will also need a toothbrush and a piece of double sided foam tape. Get an adult to help
you cut the head off a toothbrush using a pair of scissors or pliers. To build your
robot, first take a piece of double-sided foam tape and place it on the top of one end
of the toothbrush. Press down firmly and then peel off the paper backing. Next, take your
coin cell battery and place it on top of the double sided foam tape. Again, press down
firmly to make sure it sticks. Bend the two wires on the battery back, kind of like antenna
on a little bug. Then pluck off the two small pieces of insulation on the end of each wire.
Now, take the vibration motor, flip it over, and peel off the paper backing on the bottom.
The motor has a built-in sticky adhesive so you don’t need a piece of tape for it. You
can place it directly on top of the toothbrush behind the battery. Make sure that both the
motor and the battery are centered on top of the toothbrush, as this will help prevent
your robot from falling over. Now that you have the battery and motor attached to your
toothbrush, it’s time to connect their wires to make a circuit and turn your robot on.
You’ll notice that they each have two wires. Now normally in electronics, red stands for
positive, and black, or sometimes blue, stands for negative, and it’s important to get
the color coding right and make sure your wires match. While it doesn’t actually matter
for this robot because it will still work if you connect the wires backwards, it’s
still a good habit to get into. So what you’re going to do, is take the two red wires and
twist the exposed metal ends together. Make sure you twist them tightly so they don’t
come apart. Now you’ll notice that the robot isn’t moving yet. This is because I do not
have a complete circuit, or a closed circuit, where electricity can flow in a complete path
from positive to negative. The circuit is broken because the blue and black wires are
not connected yet. As soon as I touch the exposed metal parts of those two wires together,
you’ll hear the robot start to vibrate [buzzing noise]. So to turn your robot on, twist together
the exposed metal parts of the blue and black wires. When you put the robot down, it should
start to move around the table [buzzing noise]. It’s also important to avoid short circuits
by letting the metal parts of the red and black wires touch each other directly. This
will cause the battery to drain very quickly and prevent electricity from flowing through
the motor so your robot will not move. Notice that when I touch the red and black wires
together directly, the robot stops vibrating, and again this will drain the battery very
quickly, so make sure you don’t let that happen. If your robot stops moving at any
point, it’s probably because two of the wires came disconnected. Notice how here,
I didn’t twist my blue and black wires tightly enough, so they came apart and my robot stopped
moving. So keep an eye out for short circuits, and make sure that your wires stay connected,
and your robot should work just fine. Finally, if your robot falls over, double check to
make sure the battery and the motor are centered on top of the toothbrush. You can decorate
your bristlebot, for example by adding googly eyes. You can also build two bristlebots since
your kit comes with two batteries and two motors. For example, you could build a second
one using a different type of toothbrush, like this one with slanted bristles, and then
race them together to see which one is faster. To turn your robot off, just disconnect one
of the wires. Have fun playing with your brand new bristlebot. For directions for this and
thousands of other science and engineering projects, visit us online at www.sciencebuddies.org.