Lulila's Blood Stuffed Toy

This stuffed toy represents one of the characters from the children's series "Los Lunnis", her name is Lulila. But since we are on Halloween we implemented some changes so that it would fit into this theme and so that it would be scary.

To do this, we built a chair for Lulila, which, every time someone approaches her, her eyes will light up red and her head will spin, and while that happens, Lulila will raise and lower her arm while holding a full syringe of fake blood. Also, it has been modified with cuts and fake blood to make it look like a broken stuffed doll, thus frightening anyone who walks by.

For decoration:

• Wood
• Syringe
• Fake blood
• Paints
• Silicone
• Masking tape
• Alcohol

Electronic part:

• Breadboard
• Arduino base
• Arduino cables
• Arduino USB
• Two LEDs
• Resistor
• Distance sensor HC-SR04
• Two Servos

Tools:

• Scissors
• Ruler
• Utility knife
• Glue gun
• Brush
• Drill
• Saw

In the photographs and attached documents, we can see the circuit of Lulila's Stuffed Toy.

We start with the electronic part of the project to see if its functioning and code were correct (the two servo motors and the two LED's). Once this part is done, we start with the physical part of our Halloween stuffed toy.

First, we create the wooden chair, for this, we use a ruler for the measurements and a saw to cut the wood, we join the back and the base of the chair and then the legs with a silicone gun.

Since we want the head to rotate, we separate the head from the body of the stuffed toy. We empty its interior and introduce a wooden strip, which will serve as the "backbone" of the stuffed toy and will also be attached to the base of the chair using silicone. In this way, the stuffed toy will be rigid and stable on the chair.

We place the arduino base inside the stuffed toy and flat with the base of the chair. The USB cable connected to the base of the arduino would come out through the hole in the stuffed toy, through which the wooden piston attached to the chair passes. We create a small wooden base for the breadboard attached to the wooden piston, above the arduino base.

We make two holes in the stuffed toy where the distance sensor is placed on the breadboard, so there will be nothing that interferes with the sensor and all the operations will be able to act correctly, and we secure it with silicone.

To make the arm move, we introduce a wooden strip inside the arm, this will be attached to a servomotor with masking tape. The servomotor also has a small base attached with silicone to the central piston of the inner structure of the stuffed toy.

Later, we fill the body of the stuffed toy with its filling, which we remove at the beginning.

To make the head turn, we masked another servo motor on top of the wooden piston, parallel to the base of the chair, and attached another small wooden piston to the center of this servo motor with more tape.

For the eyes, we erase the paint from the eyes of the original stuffed toy with alcohol. Then, with a drill we make a hole in the center of the eyes, that is where we will put the LEDs.

Once finished with the head, we fill it with its stuffing and place it back on top of the body, being careful not to entangle or loosen any arduino cables.

Now we would have the structure made, we would only have to decorate it for Halloween. The stuffing of the stuffed toy itself is glued with silicone around its neck and back, so that it looks like it is broken, and we complete it with red paint and fake blood. To finish, we fill a syringe with fake blood and hook it with silicone to the hand of the arm that is moved by the servomotor.

The realization of this project has helped us to better understand the knowledge we have learned in class.

The choice of Lulilas's Blood Stuffed Toy has helped us learn to integrate circuits in non-rigid bodies, which has also been complicated due to its lack of stability, which is why a very firm structure has been essential.

In conclusion, we can say that thanks to the project carried out in the subject, we have understood how Arduino works, both theoretically and practically.