I am in design of a custom shield for an Arduino Due, to control the linear actuators of a small scale stewart platform to simulate offshore vessel movement. This PCB will sit on top of the Due and will include three dual bridge motor drivers (TB6612FNG) together with a power supply circuit (12V) and current sensing circuit.
The motor drivers is to PWM/DIR control the six linear actuators from Actuonix (P16, 100mm stroke, 22:1 & 46mm/s). These actuators has built in potentiometers as position feedback. The potentiometers are listed with 11k ohms +-50% and less than 2.00% feedback linearity. Picture from datasheet is attached in post.
I do not have the actuators yet so i cannot do any readings/measurements... The potentiometers will be wired to a 3.3V ref signal from the arduino and wiper will be connected to one of the analog inputs. What i want is a simple passive low pass filter on the analog input signal with a resistance and a capacitor. To prevent the likelihood of high frequency noise from the brushed DC motor inside the actuator as well as other noise sources. I am aware of filtering in software with moving average readings and similar to smooth out the signal. This will probably also be done, but i want the "worst" noise in my readings to be filtered away before it reaches the arduino's ADC.
Is there someone who can help me with how i can find the right cutoff frequency that filters out as much as possible, but not the actual readings. What parameters do i need to consider in order to find the feedback signals working frequency? If someone has any other tips or considerations to this problem, it is much appreciated.
