Servo jerk

Forum 2005-2010 (read only) Hardware Interfacing
1

I made a rig for KAP (kite aerial photography) with two servos - one for pan and one for tilt. The pan servo is modified for continuous rotation.

The sketch uses the Servo library included in 0017 and AphaBeta's FiniteStateMachine library.

The problem I encounter is that the pan servo, connected to digital 10, is influencing the tilt servo, which is on digital 11: when the pan servo stops rotating, the tilt servo makes a little 'jerk'. This seems to be an electrical problem: when I disconnect the pan servo the jerk isn't there. Adding a delay() in the sketch, after panning, doesn't solve the issue.

How can I prevent this servo from influencing the other?

Eagle schematic here, sketch here.

2

How can I prevent this servo from influencing the other?

By adding some decoupling

http://www.thebox.myzen.co.uk/Tutorial/De-coupling.html

3

Thanks, Grumpy_Mike.
I'll give that a try.

4

FWIW: big fat elco in the supply for the servos did the trick :slight_smile: