"exit status 1 no matching function for call to 'Servo::attach()'"

Using Arduino Programming Questions
1

Hello so Im doing a little project that just moves a servo motor based on the number given in the serial monitor and im getting this error exit status 1 no matching function for call to 'Servo::attach()'
How do I fix it?

full code:

#include <Servo.h>

int servo_motor = 9;
int state = 0;

void setup() {
  Servo myservo;
  myservo.attach();
  myservo.write(state);
  
  // Create serial object
  Serial.begin(9600);
  Serial.println(""); //im going to put something there

  pinMode(servo_motor, OUTPUT);
}

void loop() {
  // Have the arduino wait to recieve input
  while (Serial.available() == 0);

  // Read the input
  int val = Serial.read() - '0';

  if (val > 0) {
    Serial.println("Servo motor has moved " val );
    myservo.write(val);
  }
   
}
2

Since you create the instance of the Servo class in setup(), the servo only exists in setup() (it is in scope only in setup()). Once setup() is finished the servo no longer exists.

Move the Servo myservo; to outside of setup() so that it is in global scope.

3

yeah but the error is in void setup() [

4

oh thx

5

Don't you need to attach the servo to a pin?

6

yeah I forgot to do that

7

thx

8

That's a very narrow range of movement.

9

what do you mean

10

I mean it is a small angular displacement.

11

so how can I make it bigger

12

By specifying a bigger value.

14

now it just isn't moving

15

how though

16

If you make any changes to your code, please post the latest version so that we can keep up.

17

ok here it is

#include <Servo.h>

int servoPin = 9;
int state = 0;
Servo myservo;
  
void setup() {
  myservo.attach(9);
  myservo.write(state);
  
  // Create serial object
  Serial.begin(9600);
  Serial.println("Use 1 to turn on the light and 0 to turn it off");

  pinMode(servoPin, OUTPUT);
}

void loop() {
  // Have the arduino wait to recieve input
  while (Serial.available() == 0);

  // Read the input
  int state = Serial.read();
  if (state > 0) {
    Serial.println("Servo motor has moved " + state);
    myservo.write(state);
  }
   
}
18

now when i put a number it doesn't move

19

You have to tell it to move.
Perhaps it moving, just not very much - see above.

20

yeah it is telling it to move in myservo.write(state);

21

this is what the serial monitor says

Servo motor has moved 
Servo motor has moved 
Servo motor has moved 
Servo motor has moved 
Servo motor has moved 
Servo motor has moved 
Servo motor has moved