controlledMotion example for servo library

examples/ControlledMotion/ControlledMotion.ino

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+/*
+  Servo Demo
+
+  As Long as the button is pushed down the servo will move 
+  in a counter-clockwise direction in a stepsize of one 
+  degree till it reaches 180 degrees and then returns to 
+  start from the zero position automatically.
+
+  The circuit:
+ * Servo GND pin to ground
+ * Servo power pin to 5V
+ * Servo signal pin to digital pin 9
+ * Button:
+ * Terminal 1b to ground
+ * Terminal 2b to digital pin 2
+
+ - A graphical representation of the circuit can be found in cotrolledMotion.png
+
+  created 12 Mar 2020
+
+  by Mohamed Lotfy
+*/
+
+#include <Servo.h>
+
+Servo myservo;  // create servo object to control a servo
+int servoPos;  // variable to store the servo position
+int buttonState = 0;  // variable to track the button state
+int buttonPin = 2;  // button attached to input pin 2 of the board
+
+
+void setup() {
+  pinMode(buttonPin, INPUT_PULLUP);  // set the button pin in the board to be an input pin
+  myservo.attach(9);  // attaches the servo on pin 9 to the servo object 
+}
+
+void loop() {
+  buttonState = digitalRead(buttonPin);  // store the button state
+  myservo.write(servoPos);  // set the servo position with the intended position
+  if(buttonState == LOW) {  // increment the servo position angle if the button is pressed
+    servoPos = (servoPos+1) % 180;  // set the servo position to zero if it exceeds 180 degrees
+    delay(50);  // damp the button press effect 
+  }
+}