Reverse geocache engagement ring box

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The box

This was the first message that appeared when the device was switched on (with the middle button). It says:
Hi Réka! This box contains a great treasure. In order to get it, you must go through seven challenges.

Welcome

When viewing the first challenge it asks that you bring it outside (and wait a little so it can get a GPS fix)

Open air

After getting a GPS fix, it displays the distance from a specific point:

Distance

In the beginning it showed a map like this:

Map in the beginning

The little girl on the left slowly advanced on the road as Réka found the points. After finding and visiting the last one the map looked like this:

Map at the end

The box opened (now without the ring):

Opened box

This ring was waiting inside:

The ring

She said yes :).

Description

I proposed to Réka (my girlfriend) with this mysterious box. It took her two weeks to open.

This is a small wooden box that is latched from the inside. It has 3 buttons, a small OLED display, a microUSB charging port and a 4 pin service port on the bottom. The electronics consists of an Arduino nano, a GPS, a powerbank and an RC servo.

The box gave instructions to Réka so she could visit 7 places in Hungary that mean something for us. It opened at the last location and revealed the engagement ring which was waiting there from the beginning. I proposed to her and she said yes :).

The original reverse geocache box was constructed by Mikal Hart

Technology

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