James West

May include blinky lights. And cocktails.

Category: Quick Makes

Quick make: Adding LEDs to a world map to show the status of stuff

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.

Quick make: cocktail cabinet LED rainbow

We love our cocktail cabinet, bought at a vintage shop in Northallerton. But you can improve everything by adding LEDs to it, right?

Cocktail cabinet lights

After finishing my K9 build I’ve time to spend on a few smaller ideas I’ve had kicking around, like how to make the cocktail cabinet glow. I splurged on a Mote kit from Pimoroni and the pHat to go with it. I made a simple frame from some plywood that was in the shed and screwed the Mote strips to the outside edges. A Pi Zero W went in the middle and I threaded the cables through the gaps I’d left at the corners.

Mote sticks frame

A couple of screw eyes and some picture wire let me hang it on a picture hook behind the cabinet. I’ve just got one of the example scripts provided by Pimoroni running for the rainbow effect, but in the future I’d like to make the LEDs flash or change colour in response to a Twitter hashtag like #cocktailtime

I also think it’s time for that wallpaper to go, and paint a nice clean white wall instead.

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