When making any DIY projects, before powering ANYTHING up, check all your connectors with a multimeter's Continuity test.
What the test does, is it checks for a complete circuit and will beep when a complete circuit is made. These can also be used to test surface mount LEDs but thats our little secret.
Never plug your micro controller into a DIY board without checking everything for unwanted bridges. Every pin must be tested. It doesn't take very long, and can save you a ton of hassle. You must make sure every pin is connected where it's supposed to be, and no where else. A bad connection will fry your micro controller, ruin a servo or sensor, or destroy every servo and sensor on your contraption.