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My boys and I are using an Android phone, solar panel, and a bluetooth relay controller to make an autonomous solar robot boat. The phone has display, touch screen, GPS, compass, clock, Internet, and bluetooth. It also has a really great software development environment in App Inventor. The display/touch screen make testing really nice. We can walk around with it showing arrows pointing the way it wants to go and spinning images of propellers on the left and right ...
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/autonomous-solar-robot-boat