i have a arduino and or a pwm control board! i need to know how to take a pot and only move the pot 20 degrees and go from 0 to 100% in 1 direction only. i am green on arduinos and pwm i know they take 0 to 5 volts! but i only want the pot to turn 20 degrees and be adjustable to set points start and end! does anyone have ideas? thank you