I had this idea running through my mind for a few years now. I also wanted an excuse to incorporate a knife switch into a project. Since it is easy to associate a knife switch with Frankenstein and Frankenstein with Halloween, the Electric Chair Pumpkin was born.
Inside the pumpkin is a sound box. It is wired to the switch. When the switch is thrown, LEDs and sound effects play giving the appearance of him being electrocuted.
The project consists of:
1. Building the chair and attaching the knife switch
2. Putting together the pumpkin's body
3. Wiring the knife switch to the sound box
4. Carving the pumpkin
5. Putting on the finishing touches
Step 1: Building the Chair
I had scrap wood lying around the workshop to build a crude looking chair. I wanted it to look a little rough, so I selected the pieces that were beat up.
The legs were attached to the sides of the seat using wood glue. The same for the back and arm supports. Another piece of wood was attached to the side of the chair using L-brackets. The knife switch was then attached.
I named the chair "Sparky" after an electric chair that used to be at the Moundsville Penitentiary in Moundsville, WV.
Step 2: The Body
Inside the PVC, we'll be placing a sound box. The box has a speaker that will play sound effects when the knife switch is thrown.
To prevent the body from moving forward and back, I cut notches in the PVC. The shoulders of the body fit down in the notches. The body is nothing more than wire with some foam added. You can bend the wire to put the arms in any position you want.
Step 3: Wiring the Knife Switch
The white wires on the box were connected to the knife switch. They were not long enough so I did have to extend them, hence the black wires connected to the switch.