Acoms IC AS-7 Servo

Help,

i have just purchased my first Arduino Uno and wanted to test it out with a servo.

i followed the Knob diagram and uploaded the "example" from the library, only to find that the servo went from 0 - 180 degrees and stopped there.

this led me to believe the servo was faulty, so i attached a servo i have modified to run a full 360 and re-ran the program. this time the servo ran in a full circle.

i tried both of these servos with the "sweep" program and the same happened, the wiring has been double checked and all appears to be correct.

what am i doing wrong?

regards and thanks

Martin

Did you remember: a) a separate power supply for the servo b) a common ground between the supply and the Arduino ?