What about a small 64:1 stepper with 64:1 gearing like this. 5V so may last longer on batteries and the gearbox will give more torque.
Unless someone knows some awesome tricks to reduce magnetic interference for compasses??
I've tried disabling the stepper entirely (no current through coils) and it still has the same effect.
MarkT how would you normally reduce current when stationary. Pwm? Don't know if this is possible with the A4988 pololu stepper driver I have, step + dir inputs. This could get tricky if stationary at a micro step. I guess it would be key to always try stop at a full step where only one coil is powered?
Yes I need absolute positioning. I was going to use a electronic compass that I have but I'm getting too much interference from the stepper. Even if disabling the stepper. So I think now ill just have to setup at a know bearing and keep track of position. Unless someone knows some awesome tricks to reduce magnetic interference for compasses??