|Completed Lighted Number Puzzle|
I created a puzzle that required finding the correct large (~12") numbers and placing them on the correct spots on a base. When put in the proper position, the numbers stood and lit up. I made these from some lighted numbers I found on sale at a craft supply store. The numbers included the lights and small battery packs. I cut one wire in the light circuit and put a reed switch in-line with the wire. A reed switch will allow electricity to flow when it is very close to a magnet.
|Close-up of Reed switch taped on bottom of number|
I created a base from a small piece of wood and mounted magnets in certain spots on the bottom of the board to line up with the location of a number's reed switch. I also added another magnet for each number position that match one mounted near the from of the numbers. This pair would hold the number in place. I also weighted the backside of the numbers so they would not stand up if not held by the magnets.
I included an extra number in the room that did not light up so it would be harder to just guess the three digit combination.
It took some trial & error to find spots for the reed switches and magnets that would only activate for the correct number. This was not exact, and if you just placed the number over a magnet it would light up. In testing, some people laid the numbers on the board. I added a clue to the bottom of the base to hint that the numbers should stand up.