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arduino-cli/libraries/Servo/examples/Knob/Knob.ino

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+/*
+ Controlling a servo position using a potentiometer (variable resistor)
+ by Michal Rinott <http://people.interaction-ivrea.it/m.rinott>
+
+ modified on 8 Nov 2013
+ by Scott Fitzgerald
+ http://www.arduino.cc/en/Tutorial/Knob
+*/
+
+#include <Servo.h>
+
+Servo myservo;  // create servo object to control a servo
+
+int potpin = A0;  // analog pin used to connect the potentiometer
+int val;    // variable to read the value from the analog pin
+
+void setup() {
+  myservo.attach(9);  // attaches the servo on pin 9 to the servo object
+}
+
+void loop() {
+  val = analogRead(potpin);            // reads the value of the potentiometer (value between 0 and 1023)
+  val = map(val, 0, 1023, 0, 180);     // scale it for use with the servo (value between 0 and 180)
+  myservo.write(val);                  // sets the servo position according to the scaled value
+  delay(15);                           // waits for the servo to get there
+}

arduino-cli/libraries/Servo/examples/Knob/readme.md

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+# Knob
+
+Control the position of a RC (hobby) [servo motor](http://en.wikipedia.org/wiki/Servo_motor#RC_servos) with your Arduino and a potentiometer.
+
+This example makes use of the Arduino `Servo` library.
+
+## Hardware Required
+
+* an Arduino board
+* Servo motor
+* 10k ohm potentiometer
+* hook-up wires
+
+## Circuit
+
+Servo motors have three wires: power, ground, and signal. The power wire is typically red, and should be connected to the 5V pin on the Arduino board. The ground wire is typically black or brown and should be connected to a ground pin on the board. The signal pin is typically yellow or orange and should be connected to pin 9 on the board.
+
+The potentiometer should be wired so that its two outer pins are connected to power (+5V) and ground, and its middle pin is connected to analog input 0 on the board.
+
+![](images/knob_BB.png)
+
+(Images developed using Fritzing. For more circuit examples, see the [Fritzing project page](http://fritzing.org/projects/))
+
+## Schematic
+
+![](images/knob_schem.png)
+
+## See also
+
+* [attach()](/docs/api.md#attach)
+* [write()](/docs/api.md#write)
+* [map()](https://www.arduino.cc/en/Reference/Map)
+* [analogRead()](https://www.arduino.cc/en/Reference/AnalogRead)
+* [Servo library reference](/docs/readme.md)
+* [Sweep](../Sweep) - Sweep the shaft of a servo motor back and forth