Light Chaser Robot

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Line-pins-05.png MVI 6073 2.gif
These are the instructions to make your very own light chasing robot.


Tools You May Need

Tools You May Need
Scisers-tools.png You will definitely need some scissors. You will need them to cut the paper robot base and the foam tape. They also work for cutting the solid core wire.
Salt-tools.png Salt, pepper, sand, some sort of powder, this is completely optional. I'm not going to try to explain it now.

Make Sure You Have All The Parts

Item Quantity Name Description
parts-002300.png 1 Robot Body This is the cosmetic shell of the robot. It gives the robot its humanoid appearance.
parts-000200.png 1 Robot Base This card is the support structure for the vibrating motors and the bristle base.
parts-001700.png 1 EB1 This circuit board is a computer. The is a circuit board has a microcontroller unit ( MCU ). The MCU should, be loaded with the program needed for your robot to function. It is possible to reprogram the MCU through the USB plug built into the circuit board. Because the MCU is reprogrammable to do different functions it is technically classified as a computer. Because of the flexibility of computers they are not as fast at processing as an ASIC (application-specific integrated circuit). ASICs are designed to do one specific task and typically do it very fast or inexpensively. However computers because of their flexibility do the vast majority of processing in the world.
parts-000300.png 1 Battery This is a rechargeable lithium ion battery with an output of 3.6 volts. This batteries classified as LIR2032. The LIR represents "lithium-ion rechargeable". The first two digits of "20" signifies that the battery has a diameter of 20 mm. The last two digits "32" signifies that the battery has a thickness of 3.2 mm.

If you have the appropriate charger you can recharge this battery. However if the voltage drops to 3V or less the battery will be permanently damaged. So make sure to charge it regularly.

It is possible to use a standard lithium battery CR2032. However it's voltage is only 3V. The vibrating motors will not works well at this voltage. It is also possible to use a CR2025. This battery is only 2.5 mm thick. You may need to bend the tabs in on the EB1 circuit board to make proper contact with the battery. Because the CR2025 has less volume it will also have less capacity.

parts-001800.png 2 Vibrating Motor These are the same kind of motors used in the cell phones. These motors are not designed to run at 3.6 holes for extended periods of time. So if they seem to get hot you may want to give your robot a rest.
parts-000800.png 1 Double-Sided Adhesive Tape This piece was cut by a laser from a larger sheet of double-sided adhesive material.
parts-000600.png 1 Bristle Tabs This piece of plastic used to form the plastic tabs that will allow your robot to scoot across surfaces.

This piece of plastic was also cut by laser.

parts-000500.png 1 Rectangular plastic mounting plate He's played are made of acrylic a plastic and also cut and engraved by laser.
parts-000700.png 2 Double-Sided Foam Tape Circle These double-sided foam tape circles will be used to mount the motors hold together other parts of the robot.
parts-000900.png 1 Solid Core Wire This wire has a solid core conductor which makes it stiff and useful for holding different parts of the robot together. Because of its malleable nature you can adjust the balance of the robot. This particular wire is 24 American wire gauge (AWG). You can learn more about AWG at
parts-000400.png 2 Photo Resistor This component's resistance will change as it is exposed to more or less light.

Start Building

Cut the control panel section of the card off, leaving only the tank tread part of the card.

Cut along the four short gray lines near the corners of the card.

Remove one side of the protective material on the double-sided tape.

Tear the tape into two pieces, place it on the card as shown in the picture above and remove the remaining protective material.

Find the laser cut piece of plastic and cut or tear it into two pieces as shown in the picture above.

Bend the plastic along the dotted lines, make sure each piece is symmetrical to the other as shown in the next picture.


Now place the bent plastic onto the double-sided tape. Make sure you get them both in the same direction as shown in the picture above

If the plastic tabs are pushed against the double-sided tape there is some risk that they will stick.

You can sprinkle some salt, flour or some other kind of powder on the double-sided tape to prevent it from sticking to the tabs.

The end result will look something like this.

For cosmetic effect you can curl the corners of the card to make it look more like tank treads.

For extra cosmetic effect you can bend the small corners

Now find one of the double-sided foam tape circles and cut it in half.

Remove the top protective layer.

Cut one end of it at a right angle.

Now place the vibrating motor on the double-sided tape. Make sure that the weight hangs off the edge of the tape and can spin freely.

Cut off the excess double-sided foam tape.

Remove the remaining protective material.

Place the vibrating motor with the spinning weight hanging off of the edge of the card ( as shown in the picture above ). Again make sure that weight can spin freely.

Place one of the double-sided foam tape circles on the plastic rectangle.

You can also remove the protective paper from the plastic.

Lays the wires through the two holes as in the picture.

Pull it all the way through.

Pull the wire through the next set of holes and give the wire a little bend so that it does not slide back to the whole.

When you're done it should look something like this.

Place the wire through the hole in the circuit board.

Twist the wire around the circuit board so that it looks something like this.
Idealy you should be able to balance the circuit board upright as shown in the picture. Later this will help with the performance of the vibrating base.

Remove the protective material from the foam tape.

Stick it on the base as shown in the picture. Make sure it's facing the right direction.

When everything is set, clip the wires.

Fold the head and torso of the robot body as shown in the picture. You do not need to fold arms.

Place the body onto the circuit board.

Put the battery into the circuit board with the plus side facing outward.

For cosmetic effect, fold the paper tabs on the head.

It should look something like this.

Place one of the photo resistors as shown in the picture.

And the second one as shown.

Now you can add the motors.
Each motor should be connected to plus and minus.
You can swap the right and left motor by swapping the "A-" and "B-" pins.
You can change the direction of motor by swapping the + and - of the motor.

It seems that the propulsion through vibration works best when the motors spin in the direction of travel on the top side of the rotation. Much like the doggie paddle stroke

It's time to start the robot revaluation!

Additional Information

Light Chaser Robot Advanced

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