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Hot wire

The shape and appearance does not play a role- so long as the device functions.

I simply took 2 wooden slats, attached them to a board, and in between these two boards stretched a strong copper cable (or wire) in a wave like form.

On a 9 Volt Block battery (or 3 Volt combination out of 2x 1.5 Volt) attach a switch, and in parallel, a lamp and Piezo/buzzer. In between this put the wire and wire guide.

For stability, the wooden slats are attached to the board with a bracket. I ‘threaded’ the wire through the two holes so that it is almost 100% secure and is guaranteed not to become loose.