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Outline of the cell-straining device: (1) the user adjusts a potentiometer knob that controls the PWM frequency output of a motor driver board; (2) the PWM frequency from the motor driver board controls the speed of the crank, which dictates the frequency of strain, and this measurement is fed back to the Arduino Uno via a photo interrupter; (3) the Arduino Uno uses the photo interrupter as an encoder to calculate the speed of the crank then displays it on an attached LCD.
