The code to make the servo follow the knob's position is simpler than to make it sweep.
/*
Adafruit Arduino - Lesson 14. Knob
*/
#include <Servo.h>
int potPin = 0;
int servoPin = 9;
Servo servo;
void setup()
{
servo.attach(servoPin);
}
void loop()
{
int reading = analogRead(potPin); // 0 to 1023
int angle = reading / 6; // 0 to 180-ish
servo.write(angle);
}
There is now a second variable called 'potPin'.
To set the position of the servo, we take an analog reading from A0. This gives us a value of between 0 and 1023. Since the servo can only rotate through 180 degrees, we need to scale this down. Dividing it by six will give us an angle between 0 and 170, which will do just fine.
