I'm having some trouble controlling the movement of three servos. Two are continuous rotation and one is a high torque servo, all rated to run on 6V.
The problem is that whenever I connect the servos to a 6V battery they spin erratically at full speed. The continuous rotation servos are not so much a problem because they only move a very small amount. The high torque servo however appears to do a 180deg turn. This happens regardless of whether I'm running a sketch, or if I disconnect the signal wires and just connect the battery terminals directly to the servo.
Is this something intrinsic to all servos or am I missing some fundamentals here? How could I possibly fix it?
I would appreciate any advice here, even if it's a stab in the dark. Cheers.