Question

Code of automatic whiteboard eraser using arduino

Answer 1

#include <Servo.h>

Servo myservo;  // create servo object to control a servo
int pos = 0;    // variable to store the servo position

void setup() {
  myservo.attach(9);  // attaches the servo on pin 9 to the servo object
  pinMode(7, INPUT_PULLUP);
}

void loop() {
  int buttonState = digitalRead(7);
  if (buttonState == LOW) {
    for (pos = 0; pos <= 180; pos += 1) { // goes from 0 degrees to 180 degrees
      myservo.write(pos);              // tell servo to go to position in variable 'pos'
      delay(15);                       // waits 15ms for the servo to reach the position
    }
    for (pos = 180; pos >= 0; pos -= 1) { // goes from 180 degrees to 0 degrees
      myservo.write(pos);              // tell servo to go to position in variable 'pos'
      delay(15);                       // waits 15ms for the servo to reach the position
    }
  }
  delay(100);
}