HS-422 Servo Motor Keeps setting itself at 0 degrees after each angle callout.

[sirvonny]

Hi Everyone.

So I have a servo motor, HS-422:
Amazon.com: Hitec RCD 31422S HS-422 Deluxe Servo: Toys & Games

And I am currently running this simple code:

---

#include <Servo.h>

int servopin = 3;
int servoPos = 0;
Servo MyServo;

void setup() {
// put your setup code here, to run once:
Serial.begin(9600);
MyServo.attach(servopin);
}

void loop() {
// put your main code here, to run repeatedly:
Serial.println("What angle for the Servo?");
while(Serial.available()==0){
}
servoPos = Serial.parseInt();
MyServo.write(servoPos);
}

---

When i first ran the code with the servo powered by the Arduino, it worked as intended. However, a day later, I ran the same code through the Servo, powered by the Arduino again. What it does now is that after I give the servo an angle, it rotates to that angle for a split second and then resets at the zero position.

I read online that a possibility could be the draw current is insufficient. I have a DC power supply in possession and I was wondering if that would be useful as a power source instead of the UNO. I tried it with the power supply and I still get the same result. I have the negative terminal of the power supply commonly grounded to the arduino's ground.

Does anyone have any ideas what may be going wrong?

[slipstick]

Is the Serial monitor set to "No line ending"?

Steve

[sirvonny]

No it was not. It is working now. Thanks!

[MarkT]

The best way to parse for integer input is to skip characters until a digit - then you won't be
confused by extra blank lines or line feeds or whatever. parseInt is extremely crude.