Globale Position System based on a LDR
(light depending resistor)
The light depending resistor (LDR) detects sunrise and sunset and calculates with time and date the global position.
This project is based on the Atmel AVR Butterfly Board.
Modifications of the Butterfly Board:
6k8 resistor next to R210: replace it by a 100nF 0603. Link
LDR is a LDR07
The AVR Butterfly Board is in a waterproof and transparent case. ( It's a special case, developed by US scientists for space missions. )