I made this post other but it seems I could posre my question here.
I am doing the servo modification tutorial and I am stuck here.
5) Next we need to center the servo. Do this by plugging it in to your controller and send the signal required for it to go to 0 degrees. You should probably see the gears rotating without stopping. Now rotate the pot head (no, not that type of pot head) so that the gears stop rotating. It will probably be very sensitive so take your time. It is very important for this to be perfect. Get some superglue and glue the pot head to make sure it remains in place.
when I send the zero command, all the servo does is twitch about 15 degrees, not rotate continuously.
It does the same thing when it is fully assembled.
is this a servo, program, or circuit board error?
(my guess is that when the microcontroller goes on(I am usein 4x1.5v batteries)it takes so much power that the batteries get drained and it only has enough thime to rotate 15 degrees)