Added an example 'wiper'

examples/Wiper/Wiper.ino

@@ -0,0 +1,49 @@
+/*
+  Using a servo as a car Wiper, activated by switch.
+
+  The circuit:
+  - switch is attached from pin 2 to ground
+  - Servo's signal pin is attached to Pin 9
+
+  modified on 21 March 2020
+  by Durgesh Pachghare
+*/
+
+#include <Servo.h>
+
+Servo myservo;  // create servo object to control a servo
+
+int button_pin = 2;  // digital pin used to connect the button input
+int val;    // variable to read the value from the analog pin
+int startpos = 10;      //angle from which the servo wiper starts
+int endpos = 145;       //angle till the servo wiper rotates
+
+void setup()
+{
+  myservo.attach(9);  // attaches the servo on pin 9 to the servo object
+  pinMode(button_pin, INPUT_PULLUP);   //declares the pin as digital input
+  myservo.write(startpos);      // Initialize the servo wiper to start angle
+  pinMode(LED_BUILTIN, OUTPUT); // to show the state of servo wiper
+}
+
+void loop()
+{
+  // The button_pin is declared as INPUT_PULLUP which means switch logic is inverted.
+  // It gives LOW when the switch is pressed and HIGH when it is open
+  if (digitalRead(button_pin) == LOW)  // Start the servo if the button is pressed and complete the
+                                       // entire rotation regardless of button state later
+  {
+    digitalWrite(LED_BUILTIN, HIGH);   // status that wiper servo is activated
+    for (int pos = startpos; pos <= endpos; pos += 1)  // goes from starting angle to end angle in steps of 1 degree
+    {
+      myservo.write(pos);              // tell servo to go to position in variable 'pos'
+      delay(5);                       // waits for the servo to reach the position
+    }
+    for (int pos = endpos; pos >= startpos; pos -= 1) // goes from end angle to start angle again
+    {
+      myservo.write(pos);              // tell servo to go to position in variable 'pos'
+      delay(5);                       // waits for the servo to reach the position
+    }
+  }
+  digitalWrite(LED_BUILTIN, LOW);  //status that wiper servo has stopped
+}