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Reverse GeoCache

My family and I have recently become interested in the ‘sport’ of GeoCaching – as it was coming up to Christmas I thought it would be a great idea to combine their interests with my need for a project to keep me busy. I therefore decided to build a ‘Reverse GeoCache’ as a Christmas present. As this was relatively successful I thought I’d share the details of my build.

GeoCaching is a bit like a treasure hunt – dotted across the globe are more than a million hidden containers (GeoCaches) waiting to be found by those who are aware of their GPS co-ordinates. A Reverse GeoCache however, is a box which will only open in one location. Therefore the (un)lucky recipient of such a device can only discover it’s contents if they are successful in taking the box to the correct location.

Typically with Reverse GeoCaches the location where the box will open is not known – instead the user is prompted to press a button to ‘attempt’ to open the device. If you’re not in the right place the box won’t open and instead the device will tell you how far away the secret location is. Using this method the user can use trial and error to get closer to the final destination. Whilst you can’t buy a Reverse GeoCache – the idea is not new and others have created such a device (see here, here, here and here). Though the fun is always in the making!

With this functionality in mind and the pressing schedule (it was already the first weekend of December) I came up with a rough design, ordered some components online (Maplin, SKPang, CoolComponents and ValueZone) and eventually produced the following:

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