Servo stop motion loop if button is released

Projects Programming
1

I can get this servo program to go through the motion profile I want, but what I can't get it to do is the moment you let off the button I want the servo to instantly return to the 0 position no matter where it is in the program. The servo always goes through the loop once. Can anyone help and fix this program to do so? I have tried and tried. Thanks for your help.

Here is the code I have.

#include <VarSpeedServo.h>
VarSpeedServo myservo; // create servo object to control a servo
int pos = 0; // variable to store the servo position
const int buttonPin = 12; //sets pin 2 as button
int buttonState = 0; //sets button 1 as off
void setup()
{
myservo.attach(9); // attaches the servo on pin 9 to the servo object
pinMode (buttonPin, INPUT); // sets button as input
if (buttonState == HIGH)
{myservo.write(0,255,true);
delay (10);
}
else {
delay(50);
myservo.write(0,10,true);
delay(50);
}

}
void loop()
{
buttonState = digitalRead(buttonPin);
if (buttonState == HIGH)
{

myservo.write(90,10,true);
delay(50);

for(pos = 90; pos <= 180; pos += 1) // goes from 0 degrees to 180 degrees
{ // 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(pos = 180; pos>=90; 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

}
}
else {
delay(50);
myservo.write(0,10,true);
delay(50);
}
}

2

I would think an interrupt would do exactly what you're asking.

3

You need to switch to using millis() to control the servo movement timing. That way you can read the switch pin between each servo step.

Basically you move a little, read the input, move a little, read the input and so on.

See the BlinkWithoutDelay example in the IDE.

4

Look at how the servo is controlled in the demo several things at a time

...R

5 
#include <VarSpeedServo.h>
VarSpeedServo myservo; // create servo object to control a servo
int pos = 0; // variable to store the servo position
const int buttonPin = 12; //sets pin 2 as button
int buttonState = 0; //sets button 1 as off
void setup()
{
myservo.attach(9); // attaches the servo on pin 9 to the servo object
pinMode (buttonPin, INPUT); // sets button as input
if (buttonState == HIGH)
{myservo.write(0,255,true);
delay (10);
}
else {
delay(50);
myservo.write(0,10,true);
delay(50);
}

}
void loop()
{
buttonState = digitalRead(buttonPin);
if (buttonState == HIGH)
{
 
myservo.write(90,10,true);
delay(50);

  for(pos = 90; pos <= 180; pos += 1) // goes from 0 degrees to 180 degrees
  {  // in steps of 1 degree
    if (digitalRead(buttonPin) == LOW)
        break;
    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>=90; pos-=1)     // goes from 180 degrees to 0 degrees
  {
    if (digitalRead(buttonPin) == LOW)
        break;
                               
    myservo.write(pos);              // tell servo to go to position in variable 'pos'
    delay(15);                       // waits 15ms for the servo to reach the position
  }
}

delay(50);
myservo.write(0,10,true);
delay(50);
}