Servo keeps rotating

Question

I use a 360° servo with a program I made on an Arduino Uno.

The program was meant to control two separate servos with two potentiometers on a breadboard.

When I used 180° and 90° servos, it worked fine, but when the 180° servo was swapped with a 360° servo, it kept spinning and spinning non-stop.

Could it be the knock-off board (not Arduino brand) I'm using?

Servo serX; // create servo object to control a servo for x axis
Servo serY; // create servo y axis
int pot1 = 0; // potentiometer pin number on board
int pot2 = 1; // potentiometer number 2
int val; // variable to read the value from the analog pin
int val2; // read value from other analog pin
void setup() {
 serX.attach(9); // attaches the servo on pin 9 to the servo object
 serY.attach(10); // attach servo to number 10 pin
}
void loop() {
 val = analogRead(pot1); // reads the value of the potentiometer
 val = map(val, 0, 1023, 0, 180); // scale it to use it with the servo
 serX.write(val); // sets the servo position
 
 val2 = analogRead(pot2); // reads the value of the potentiometer
 val2 = map(val2, 0, 1023, 0, 90); // scale it to use it with the servo
 serY.write(val2); // sets the servo position
 
 delay(15); // waits for the servo to get there
}

• Majenko: Is this a "continuous rotation" servo? If so then the "angle" defines the speed and direction of rotation, with 90° normally being "stop".

Answer 1

The "360°" you refer to is probably a continuous-rotation servo.

These servos behave more like motors than like the normal RC servos; the signal you send such a servo will determine its speed and direction, not its position, and a pulse width of 1.5 ms (the "90° setting") will make it stop.

There's an article on the Adafruit site where you can read more about this.