4. Write a sketch that uses a component to read the analog input A0 pin, which will be controlled by a potentiometer, on the Arduino board to turn on three LED's. Map the analog value from the potentiometer to simulate a function generator that has a range of 0-12 volts. When the mapped voltage is less than 4 V, a green LED will turn on using a digital pin on the Arduino board. When the mapped voltage is between 4-8 V, a white LED will turn on using a digital pin on the Arduino board. When the mapped voltage is greater than 8 V, a blue LED will turn on using a digital pin on the Arduino board