What a brilliant idea! I have an Arduino lying around but yet to learn it, though http://arduiniana.org/projects/the-reverse-geo-cache-puzzle/

https://www.facebook.com/SilverSurfers50/photos/a.425990670754996/648683121819082/?cft[0]=AZV-Rv0bSLuao4xXwkd0MKvURUiWC6lA3bic5kIVrLHsaUWD-8kM_Ae51SVvsNogj2m3hlkQBwi99dp-l2Pu2huA4V5BW-tDk5uHG8Wg0UydgncqEZl5of6U9pDDnuAaiCbghnF7X4rg3ug_Jz_rjalKghGIjl3BeflNA5tIHpfXag&tn=%2CO%2CP-y-R

(I can hear the song from Slade)

When I was at ICW, I spotted this nice little Levitron thingy which they were testing on a model. So, after speaking with the guys, I decided to try it out. It was fun until I put the magnet back by myself… So, with a model, I have to be very careful with it.

You have made Malaysia proud!https://www.facebook.com/photo/?fbid=10202534479144429&set=a.1193649522599&cft[0]=AZXwpC6aLxJnYUPcOwKiEbZ6mQgGuuWSm2bXVCU1tKi4WccI5k0o8XK0ZxmsF3Ua6E399djwVJoP-UWuILSiMp8NvPwofoXAnswgO_P8UwaRTrgEOlmwI_nlBAHw3omRE4gd2ghRuG7QEkj7padx1miZ353CMbZmWzmovzc8OafzBg&tn=%2CO*F As reported by Tai Ho MaGunpla Builders World Cup (GBWC) Final 2013 Open Course1st – Japan2nd – Malaysia3rd – Korea Junior Course1st – Hong Kong2nd – Indonesia3rd – Taiwan