Perstaltic Pump Whine

I want to build a variable speed pump.

I am using an ADA1150 pump, with a DF Robot L293 motor shield, and an Arduino. The pump is supplied with a PWM current. The pump has a whine that reverberates when ever it touches a hard surface or mount, at less than 99% speed. What can be done?


Hi Michael,

What frequency is the PWM configred for?