I'm developing a software and the software has to know where the hardware is oriented to (North, West, etc...)
I want to buy in ebay a circuit like this (or similar):
**broken link removed**
My question is what are the steps to introduce the information from the circuit to the computer. I want to use a RS-232 connection or USB.
Maybe Arduino would be the best option? Maybe other?
I want also to use 4 circuits at the same time, that are connected to the computer.