You could get better accuracy from a DC motor + slotted disk and opto sensor by triggering on both edges of the slot and reducing the motor drive on the leading edge ans actively braking on the trainling edge. So you stop from lower speed. The speed reduction could be as simple as turning off the power to let it coast before actively braking. Or apply two levels of braking.
A DC motor is a good option is the motion is always 45° increments and driving to the first slot after power on is acceptable, but you don't know where the output is.
The serial servo has the advantage that at power on you immediately know the position within the 0 - 360° range.
A good example of it's use in this context is a hand on a clock. You need to know the absolute position around the dial, but also need to rotate without limit. I'm confident the servo can do that.
Other solutions could do the same if a 360° absolute position sensor is added, or built into the motor. Stepper, DC motor, BLDC...
If RoLi70 already has the servo I would use it.
A DC motor is a good option is the motion is always 45° increments and driving to the first slot after power on is acceptable, but you don't know where the output is.
The serial servo has the advantage that at power on you immediately know the position within the 0 - 360° range.
A good example of it's use in this context is a hand on a clock. You need to know the absolute position around the dial, but also need to rotate without limit. I'm confident the servo can do that.
Other solutions could do the same if a 360° absolute position sensor is added, or built into the motor. Stepper, DC motor, BLDC...
If RoLi70 already has the servo I would use it.
Statistics: Posted by PiGraham — Sun Dec 01, 2024 11:00 am