# Help with an electronic geocache project

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#### badscr

##### New Member
A big box with a spring loaded door that has a Door-Lock-Actuator tied into the µController.
This way people have a secure/Weather-resistant place to put there cache.

Off topic.
As for Trackable Items;

#### MrDEB

##### Well-Known Member
good source for switches

If here in the states look at
Giant CDS Cell Assortment-The Electronic Goldmine
here is an idea I had using an ON/OFF/ON switch.
every time you open the lid the code is changed from sat 1001 to 0110 etc.
the idea of a PIC is perhaps your best bet but don't have more than 3 or four combos.
may be too frustrating.
in my circuit it has only two different correct answers depending on the lid opening switch which is an ON/OFF/ON.
the 7555 is for PWM (conserve battery life)
the RED LED indcates a wrong answer.
the LED displays are hard wired to each desired segment so when you get a correct code entry the LED displays light up.
circuit needs work but it could be a basis for your project.

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• combo lock..PNG
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#### vne147

##### Member
N 38 33. XXX
W 076 04.XXX

BTW, are these going to be the actual degress and minutes you'll want the final product to display or were they just an example?

#### CAPT Bligh

##### New Member
the idea of a PIC is perhaps your best bet but don't have more than 3 or four combos.
may be too frustrating.
in my circuit it has only two different correct answers depending on the lid opening switch which is an ON/OFF/ON.
the 7555 is for PWM (conserve battery life)
the RED LED indcates a wrong answer.
the LED displays are hard wired to each desired segment so when you get a correct code entry the LED displays light up.
circuit needs work but it could be a basis for your project.

MrDEB--thanks for the suggestions. I think I'm going to go with a unique solution, and just have some mechanical means of resetting the switches, such as safety covers. I showed some different possibilities to my wifely geo-partner, and she strongly preferred the simplest (like I said before, the longer I'm given to think about it, the more complicated I'll make it!). So I'll only need the PIC for the fancy dancing LEDs when the right solution is set.

#### CAPT Bligh

##### New Member
BTW, are these going to be the actual degress and minutes you'll want the final product to display or were they just an example?

Those are approximate but not final. When will you need to know?

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