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Has anyone tried to make Android and Arduino communicate with each other?
I found a couple of projects online:
What do you guys suggest is the best way to make those two communicate?
Either build a serial cable for your Android phone, like this one for the G1,
http://www.instructables.com/id/Android-G1-Serial-To-Arduino/.
Or add a Bluetooth module to your Arduino,
or use an Ethernet-shield for your Arduino and connect via TCP/IP.
Which one to use depends on your project and your budget. I don’t know if the serial cable option exists for phones other than the G1. The Bluetooth module has the advantage of beeing wireless for both, the Arduino and the phone, and using the Ethernet-shield you could make the Arduino worldwide accessible by using port-forwarding on your firewall.