Useless Box

I made an useless box for my systems engineering class. The box's only purpose is to turn itself off after you turn it on.

Supplies:

1. Motor with gearbox
2. Limit switch
3. Toggle switch
4. Battery case x2AA
5. Sheathed wires
6. 3D printed arm piece
7. 3D printed motor mounting
8. Wooden box pieces
9. 2x AA batteries

Tools:

1. Soldering iron
2. 3D printer
3. TinkerCad
4. Cirkit designer
5. Ruler
6. Pencil
7. Wire stripper
8. Super glue

I drew my annotated drawings showing the rough dimensions of the box that i'm making explaining the layout with the different parts inside.

On Cirkit I designed my wiring design for my useless box, I did this from the instructions given to the class by my teacher.

For the first part of soldering together your wiring you strip the ends of the wire and tin them, then to connect them to the 2 ports of the motor and connect the other ends of those to the correct ports on the toggle switch.

Now take the battery case and tin the ends of both of the wires coming from that, then attach the positive wire to the correct spot on the toggle switch. The 2nd wire is left free.

For part 3 you get 2 double ended stripped wires and twist together the ends from one of each wire, then solder together the double twisted end with the ground wire (2nd) from the battery case.

As for this next part, you get your limit switch and connect the XX to one end of the white double join piece, and then another stripped and tinned wire from XX to the correct spot on the toggle switch.

For the final step of soldering, you take the other end of the white double wire piece and connect that to the correct spot on the toggle switch. Now you take a new short piece of stripped wire and tin the ends and connect both ends to 2 remaining empty spots on the bottom of the toggle switch.

close up of finished toggle switch.

Next you take 2x AA batteries and put them in the battery case, check all your wires are connected properly, then you flick your toggle switch and the motor part should turn like you will want it to later.

Next you will design your 3D printed arm to the right dimensions and with the correct sized hole for it to fit onto the motor, now you print your desgin. Then you will design your 3D printed motor mount and print this as well.

Put your arm on the correct side of the motor, then screw in the motor and limit switch into the mounting.

Next use super glue to put together the pieces of wood to make the box that is going to hold your wiring, motor and other things. Then screw in the hinges for the lid of the box.

Now you put your finished wiring with the motor and limit switch on the mounting into the box after the glue has dried and next you screw the mounting into the box in the correct position.