added INPUT_PULLUP and necessary changes

Author: Inv3nt0r1

examples/Wiper/Wiper.ino

@@ -1,8 +1,12 @@
 /*
- Using a servo as a car Wiper, activated by switch.
+  Using a servo as a car Wiper, activated by switch.
 
- modified on 19 March 2020
- by Durgesh Pachghare
+  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>
@@ -14,26 +18,32 @@ 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() 
+void setup()
 {
   myservo.attach(9);  // attaches the servo on pin 9 to the servo object
-  pinMode(button_pin,INPUT);    //declares the pin as digital input
+  pinMode(button_pin, INPUT_PULLUP);   //declares the pin as digital input
   myservo.write(startpos);      // Initialize the servo wiper to start angle
+  pinMode(13, OUTPUT);
 }
 
-void loop() 
+void loop()
 {
-    if(digitalRead(button_pin))     //Start the servo if the button is pressed and complete the entire rotation regardless of button state later
+  //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(13, 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 15ms for the servo to reach the position
+    }
+    for (int pos = endpos; pos >= startpos; pos -= 1) // goes from end angle to start angle again
     {
-        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(15);                       // waits 15ms 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(15);                       // waits 15ms for the servo to reach the position
-        }
+      myservo.write(pos);              // tell servo to go to position in variable 'pos'
+      delay(5);                       // waits 15ms for the servo to reach the position
     }
+  }
+  digitalWrite(13, LOW);  //status that wiper servo has stopped
 }