Servo motor can't move

[clowooooooo]

Hi, i need help with my servos that can't move. I am currently working on a robotic arm that has two servo motors, and prior to this it was still functioning when I tried moving it with a potentiometer. The next day when I plugged in a new code, none of the servos will move, even with the original code I used previously. The same goes to a new servo motor that wasn't previously tested.

Here's the circuit schematic and respective code I've used to test the S996R servo motor. I used the default USB connection as a power source.

#include <Servo.h>

Servo myservo;  

int pos = 0;    

void setup() {
  myservo.attach(9); 
}

void loop() {
    for (pos = 0; pos <= 180; pos += 1) // change here in the place 0 and 180 , into any two degrees you wish the servo to sweep.
    { 
    
     myservo.write(pos);              
     delay(15);                      
    }
    
    for (pos = 180; pos >= 0; pos -= 1)  // change here also  in the place 0 and 180 , into any two degrees you wish the servo to sweep.
    { 
     myservo.write(pos);              
     delay(15);                       
    }
}


type or paste code here

[mancera1979]

@clowooooooo

I used the default USB connection as a power source.

You need to use a separate power supply capable of delivering at least 2.5A

[jim-p]

Are you saying that it actually worked OK at some point with the servo power comming from the 5V pin and with the board powered via USB?

[DaveX]

@clowooooooo

Here's the circuit schematic

That is a picture of your system. Folks can't tell design mistakes from assembly mistakes/bad connections with a picture of a system.

How to make a schematic you can post.

When you submit a question on the forum you will usually need to add a schematic (circuit diagram). The tutorial that follows will explain some ways to create a useful image; however lets start by explaining how to add the image to your post. Its easy. Having created the image all you need to do is : Save the image somewhere convenient - maybe your desktop Start your post, and place the cursor (insertion point) where you want the image to be shown; [upload image to forum] 3: click th…

[mancera1979]

Make sure you are connecting the servo according to its specs.

Usually like this. Yours may vary

[clowooooooo]

Alright, I have a 12v power adaptor. will it be sufficient?

[clowooooooo]

yes. it was working fine prior to this. i reused the program on both SG90 servo and MG996R and both of them were perfectly functionable.

however the next day when i tried it again it stopped moving completely

[clowooooooo]

i see, i connected the signal to the middle wire and it was functioning

[clowooooooo]

oh so sorry, ill make a schematic that represents the system real quick

[van_der_decken]

Putting 12V through the typical hobby servo that's rated for 4.8 to 6V will very likely result in a puff of smoke, a bad smell, and an ex-servo.

You need more Amps, not Volts.

[jim-p]

@clowooooooo

however the next day when i tried it again it stopped moving completely

Although you should not power any servo from an arduino 5V output, it's strange that it worked one day and not the next. You may have damaged the Arduino.

Does your arduino still work?
Can you run the blink example ino?

Power the servo from a separate 5V supply and use a different Arduino pin.
Don't run the 5V power through the breadboard, connect directly to the servo.
Does it work now?

[xfpd]

@clowooooooo

signal to the middle wire and it was functioning

What you saw was not "functioning" that was electricity applied incorrectly which had 5vdc 12vdc on PWM giving the servo a 100% duty cycle 200% its rated sinking capability.

[clowooooooo]

yes, my arduino still works, i have just ran the blink example.

i assume my servos failure to be due to the insufficient voltage and current.

Power the servo from a separate 5V supply and use a different Arduino pin.

May i know how am I able to make use of a 5v supply? what kind of battery would you recommend?