Ardunio not working with Servo

[Sebastian Kurpiel]

Hey guys, I'm new to Arduino and I can't seem to figure out how to get my servo working, making a RFID door lock. I loaded everything successfully to the board however nothing happens... The servo is between 4.8 and 5 volts, I attached a 12 volt back just for some extra power, not sure you can do that... Not sure it matters but my board is an elegoo uno r3, a clone but I heard good things about them and it was cheaper than an Arduino. Thanks for any help in advance.

 

 

#include <Servo.h>

Servo myservo;

void setup() {
  myservo.attach(7);
  // put your setup code here, to run once:

}

void loop() {
  myservo.write(170);
  delay(1000);
  myservo.write(10);
  delay(100);
  // put your main code here, to run repeatedly:

}

 

[Sebastian Kurpiel]

Nevermind the servo wasn't connected to the ground on the ardunio...

[Unimportant]

I'd add some decoupling caps on that breadboard, let's say 100uF and 100nF in parallel on the servo power supply. Should help keep the servo noise away from the microcontroller.

[grimreeper132]

I would suggest using pin 9 or 10 for the servo, as when you use the servo library, both pins PWM control is removed for some reason, even if you aren't using those pins for the servo, minor gripe but if you are doing other things with the arduino at the same time, which includes PWM (analogwrites, etc.) then it is best not to use them for the servo in order for you to get the maximum remaining PWM pins for other things