In a recent sale my local branch of The Works was selling this cork world map. It was only a few quid – even less than the £7 sticker price and I thought it could be improved by adding some LEDs to it.
Today I finally got this sorted, starting out with a test build of the circuit, wiring two groups of LEDs in parallel (blue and yellow to match the buttons I’d got), with a 100 ohm resistor for each one.
I decided where to put the LEDs on the map, and drilled 3mm holes with my Dremel for them. I also marked out where the buttons needed to go and used a craft knife to cut through the layers of cork, corrugated paper and card that make up the sandwich of the board. The LEDs were hot-glued into place after being pushed through the map, Because the board was quite thick they ended up being just about flush with the surface which gives quite a nice effect when they light up.
I also fastened a 3 x AAA battery box onto the back and stuck the power rails from a breadboard nearby to help hook up the LEDs.
Next I soldered a resistor to the cathode of each LED and wired up the buttons and battery pack to the breadboard. Then I connected the LEDs to the power and used electrical tape to cover up the exposed LED legs to prevent an short circuits.
I’m happy with how this came out. The location of the LEDs in this case isn’t important, they can be used to indicate whatever you imagine: the location of Dalek invaders and UNIT forces for instance. You could put them on specific continents or oceans to help with geography homework or show where particular food, animals, or resources come from.