When Opening Serial Port Servos Movement Halts

Projects Programming
1

I am able to move three servos simultaneously with/without servo libraries. Everything changed after I used the Serial.Begin(9600) statement.
Arduino
3xSG90 (connected to an external PSU)

int PIN_SERVO1=1;
int GRA1_SER1=0;
int GRA2_SER1=180;


void setup() {  

}

void loop() {
  Servo1 (); 
  
}
void moverServo1 (int pin, int angulo)
{

    
   pinMode(pin,OUTPUT);
   pausa = angulo*2000.0/180.0 + 500;
   digitalWrite(pin, HIGH);
   delayMicroseconds(pausa);
   digitalWrite(pin, LOW);
   delayMicroseconds(250-pausa);
  
 
 }
 ///////////////////////////////////////

 void Servo1 ()
 {
    moverServo1(PIN_SERVO1, GRA1_SER1);
    delay(100);
   
    moverServo1(PIN_SERVO1, GRA2_SER1);
    delay(100);
 
 }

After few changes to the above code, I have it working flawlessly with three servos. My problem resides after adding:

void setup(){
Serial.begin(3600);
}...

only one servo works. So, I am assuming that opening the serial port affects the PWM signals sent out to the servos. I really need the serial port for my project. Is this a close assumption?

Note: I used a similar code using a servo library with the same results. Serial port conflicted when more than one servo running.

Thanks

2

You did not show your code for three servos and you did not explain what Arduino you are using, but pins zero and one may be used for the serial port so using pin one for a servo would be bad.

3

I already figured it out. On Arduino UNO pins three, five,and six are PWM. I switched servos to those pins;then, I opened the serial port and servos are working.

Thanks

4

Great!

5

hbtousa:
I already figured it out. On Arduino UNO pins three, five,and six are PWM. I switched servos to those pins;then, I opened the serial port and servos are working.

Thanks

But you don't need to use PWM capable pins to control servos

6

Is there any good reason not to use the Servo library?