Inspired by http://cjhsdigitalmusic.weebly.com/
Materials:
Copper tape with conductive adhesive
Foam puzzle mats - I purchased used. Used both solid and the mats with cutouts
Sheet Metal - fold some duct tape around the edges, its sharp!
Makey Makey
Duct tape
Procedure:
Create the moment contact: Line the underside of the foam mats with conductive tape
Strip about an inch of wire a and lay on the bottom of the mat. Secure with more conductive tape. The other side will connect to the up down left right space.
Connect 6 mats with cutouts together to on top of the 24 x 36 steel sheet.
Place the mats with the wire conductive tape on top
Run the wires neatly along the edge.
Duct tape the steel sheet to the top foam.