Picture of Cheap motion activated coffin
This is how I built a coffin that has sound, fog, lights, and a motion activated lid. To watch a video see my photobucket site.

Step 1: Building the coffin

Picture of Building the coffin
I started by cutting a piece of plywood to the shape and size of the bottom of the coffin. From there I built a simple frame out of 2x4s. I attached 1x4s to make the exterior of the coffin.
That is a great looking coffin you built there. Too bad it got ruined in the flooding of your storage shed. I do have a question if you dont mind me asking. When you say you watered down the grey paint, how much water did you add to how much paint? Was it a 50 50 solution? Thanks!
CMK4425 (author)  Brian Fuehrer3 years ago
I don't remember but I sprayed with my air spray gun It was pretty watered down from what I recall.
bethehammer5 years ago
very nice, more details on parts used, sources, and close up pictures of the key assemblies. Thanks!
CMK4425 (author)  bethehammer5 years ago
Thanks but during the next year my yard flooded and the shed where the coffin was had about 6 inches of water in it. So all of the mechanical parts were ruined. This year it will be my fog chiller. Here is the mechanical parts. http://i113.photobucket.com/albums/n207/cmk4425/PneuControl.jpg
CMK4425 (author) 6 years ago
the motion detector is set on test mode so it only stays active for like 3 seconds at a time the flasher relay just makes in turn on and off while active
rpg0076 years ago
using the flasher relay does the coffin continuously open and close once activated?
CMK4425 (author) 7 years ago
Its not actually split into 3 directions it is an in and 2 out. In order for the lid to fall back down I needed a way to let the air back out so the other out leg is just a piece of tubing with a regulator on it to control the speed of the air coming out and the speed of the falling action.
savagemania7 years ago
Does anyone have more info on how the solenoid and pneumatics work.
if it is the valve yuor talking about look around in Google and look for sprinkler hack a mod of turning a sprinkler into a airtight valve pretty handy too i made one :)
a pneumatic or the air one is like a hydrolic ram and the electric one uses a motor to push it up and a solenoid is sorta like a valve that uses a pin to lift up a valve to let what every your flowing through the valve if your talking about the valve one thats my way i i think thats what it is...
askickn17 years ago
what is it that releases the air quickly when it shuts off? why is the air supply split into three different directions. Thanks for your info. great Idea.
padfan7 years ago
May I suggest adding fake skeleton arms and hands to the door of the coffin. It will look like something is trying to escape.
IAE8 years ago
what's your foto bucet site????
Cool I like the DIY pneumatic actuator system
eaglemanusa8 years ago
to cut down on the weight, I used L brackets instead of wood at all the joints and the bottom was just nailed into the sides. worked well.
giustie8 years ago
wow amazing this would be a nice project to try...
CMK4425 (author) 8 years ago
It is too heavy for one person to move and too bulky. The materials could be changed in order to cut down on weight I just used what I had.
jasonmphoto8 years ago
That looks fantastic. I'm curious about the weight of the coffin. Can one person lift and move it? Do you think 2x2's would be strudy enough for the inner framing?
CMK4425 (author) 8 years ago
I already have a fog chiller but is is too big to fit in the coffin. Thanks for the comments
mbl858 years ago
love it. have you ever thought about making a fog chiller to create a low lying for effect or fog waterfall to spew out of your coffin?
zachninme8 years ago
All I can say is "Wow" Really, that's it. I am just so amazed. Awesome job! (And glad to hear about photobucket movies!)
ewilhelm8 years ago
Sorry that we don't yet support movies from photobucket! I just added it to the todo list.
CMK4425 (author) 8 years ago
I added the chain and weathered the coffin.
CMK4425 (author) 8 years ago
This shows the layout of the interior of the coffin.
CMK4425 (author) 8 years ago
Here you can see the shape of the coffin and you can also see the motion detector at the bottom.