Write an Arduino program that combines parts 1 and 2 in such a way that the servos is incrementing or decrementing while the Arduino is also listening for serial input.

a. the Arduino should respond immediately to any serial input

i. the code cannot wait until the servo has reached a certain position before checking for serial input

ii. your final code cannot use any delay statements

b. Hint: this is going to require a carefully-planned state machine. Start with a state diagram!