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2014 - Fire and Ice (GC4TXB2)

Fire and Ice (GC4TXB2) by bflentje

Last year I hid a geocache that had several gadgets at various stages of the multicache.  These gadgets were electronic in nature and operated using Arduino microprocessors. As an offshoot of what I learn from that experience, my latest creation is similar but requires a bit more user interaction with the device in order to be successful.

Fire and Ice is a very short, but fun and family friendly, three stage multicache. Stage #1 contains nothing more than a marker in an attempt to keep the non-serious geocacher away from the device. Stage #2 is an Arduino driven circuit device which when successfully solved, directs the seeker to the final third stage.

The principle behind the device at stage #2 is simple; change the temperature of the device 40 degrees, one direction or the other, using any non-destructive means possible. The device contains two different temperature sensors. One is built into the device which monitors the ambient temperature. The other sensor is installed within the external probe in which the geocacher interacts. In order to unlock the coordinates to the final stage, the geocacher must change the temperature of the probe to be either 40 degrees hotter or colder than the recorded ambient temperature. This can be done with ice water, a slushy, hot coffee, or by other methods. In the winter, one could even just use the warmth of their body to make the change. One gang of geocachers even managed to get the job done by using the friction of a looped lanyard. The only method that is not recommended is the use of fire. Besides the possibility of destroying the probe, it is considered a violation of park ordinance.

Please note to all of those geocachers concerned about the geocaching guidelines that this hide has been granted explicit permission of both the hosting park system and from geocaching.com. Please do not assume that the mounting mechanism used here is for general practice.

SPOILER ALERT Do not proceed unless you want to completely ruin your fun.

Enjoy the photographs (click thumbnails for larger view)..

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