Permbledhje
Ke patur ndonjehere deshire te ndertoje robotin tend garues? BristleBots jane te lire,te lehte, and fun-to-build robot made from the head of a toothbrush, a battery, and a small motor. Once completed, they buzz along the top of a table like bugs. In this project, you will build assorted BristleBots with different types of toothbrushes and race them against each other.
Materialet
Toothbrushes (2). One with straight bristles and one with slanted bristles. You can get more if you want to test additional kinds of bristles.
o Important: Toothbrush heads that are too small or narrow may be too top-heavy when you add the motor and battery, and therefore tend to fall over. Larger toothbrushes will be more stable.
Strong scissors or wire cutters (to snip off the toothbrush heads)
Roll of double-sided foam tape (to mount the motor and battery to the toothbrush head) available from Amazon.com
Roll of electrical tape (to help attach the motor wires to the battery).
Small binder clips (optional) if you are having trouble getting a good connection between your motor wires and the battery, these can be used to help "clip" the wires on.
CR1220 3-volt coin cell batteries (2), available from Amazon.com
Small vibrating motors (2), available from Amazon.com
Piece of printer or construction paper (to create the chute to race your robots), minimum size 8½" x 11" (larger is OK)
Stopwatch
Lab notebook
These directions show you how to build one robot. Repeat Steps 1-6 to build your second robot. We have rewritten our own directions here, but remember that Evil Mad Scientist laboratories also has a great video showing how to build a BristleBot if you need additional help. We have also added one more recommended step using tape to attach the motor wires to the battery (otherwise it can be hard to get them to touch and make a good connection).
1. Cutting off the toothbrush head ask an adult to help you with this step! Use a strong pair of scissors or wire cutters to cut off the head of a toothbrush. If you cannot cut all the way through the plastic, it should be easy to snap the head off after you have cut into the surface. Figure 1 below shows several different toothbrush heads after they have been removed from the shaft of the toothbrush.
2. Arrange the rest of the materials you need to build one BristleBot: a piece of foam tape, a battery, and a motor. These pieces are shown in Figure 2 below.
3. Peel the backing off the foam tape and attach it to the top surface of the toothbrush head. This step is shown in Figure 3 below.
4. Using electrical tape, attach one of the motor wires to one side of the battery. Make sure the exposed metal part of the wire is touching the metal on the battery, as shown in Figure 4 below. Note: The images are taken with clear tape so that you can see the position of the wires more clearly. But, we recommend using electrical tape on your BristleBot instead as it will hold the wires together better than clear adhesive tape when the robot moves.
5. Put the motor and battery on top of the piece of foam tape, with the taped-down motor lead side of the battery facing down, as shown in Figure 5 below.Important: Make sure that the motor's weight can spin freely and does not get stuck on the tape. Do this by putting the main body of the motor on the foam tape, letting the spinning weight hang slightly off the edge of the tape.
6. Attach the remaining motor wire to the top of the battery, as shown in Figure 6 below. With patience and a few tries, you should be able to bend the wire and press it against the side of the battery and it will stay there, but this can be hard to do. Getting a good connection to the battery with both of the motor wires is essential for your BristleBot to work properly. If one of the wires is not touching the battery, the circuit is still open, so the motor will not spin, and your BristleBot will not move. If you are having trouble getting a good connection, you can try a few things:
a. Use electrical tape to attach the end of the remaining wire to the battery. This might make it easier for the wires to stick to the battery.
b. Use a small binder clip to "pinch" the wires to the battery. Make sure to cover the wires with tape first if you are using metal binder clips (otherwise electricity will flow through the binder clip and not through the motor). This might make the connection better, but it also risks making your BristleBot top-heavy and more likely to fall over, depending on the size of your toothbrush head and the size of your binder clip.
c. (Ask an adult to do this step). Using scissors, a sharp knife, or wire strippers if you have them available, try to remove some insulation from the ends of the motor wires, making the exposed metal part longer. This might make it easier to get a good connection.
7. Repeat steps 1-6 to build your second BristleBot with a different type of toothbrush head. In the meantime, temporarily detach the top motor wire from the battery of your first BristleBot, so you do not drain the battery (and do it does not escape when you are not looking!).
Note: If you remove the motor and battery from the foam tape and put them back on several times, the tape might start to lose its stickiness. If this happens, simply use a new piece of tape from the roll you bought for this project.
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