4 servos and 1 due

Other Hardware Motors, Mechanics, Power and CNC
1

Hi,
I want to run 4 servos at the same time, but i have a problem.
When I connect 2 to the due, they work fine. With 3 servos, they work, but 1 of them get delayed. With 4, it happens the same, but the 4th doesn't work at all.
The servo runs at 4.8-6V, and my power supply has 12v and 1A output.
Could the power supply be the problem?
Thanks in advance.

#include <Servo.h> 

Servo servo1, servo2, servo3, servo4; 

 
void setup() 
{ 
  servo1.attach(32, 900, 2100);
  servo2.attach(33, 900, 2100);
  servo3.attach(34, 900, 2100);
  servo4.attach(35, 900, 2100); 
} 
 
void loop() 
{ 
  servo1.writeMicroseconds(1530);
  servo2.writeMicroseconds(1530);
  servo3.writeMicroseconds(1530);
  servo4.writeMicroseconds(1530);
}

4 servos.jpg
4 servos.jpg1842×1920 442 KB

2

You need a separate power supply for the servos. The Arduino 5v pin can't provide nearly enough current. It's not really a good idea even to power a single servo that way.

Make sure that the ground for the servo power is connected to the Arduino ground.

...R

3

Thanks for the quick rely
What kind of power supply do i need for them? I think this is a parallel circuits, that means the voltage is the same for all elements, but the current will be divided. So, basically, I need a source that has a higher current than mine (of course, it connects directly to servos). Am I right?

4

There is also the issue that the servos may be expecting a 5V logic input, so
3.3V might be unreliable...

5

yea it must be connected to 5v. I'll make sure that they're connected to 5v like always.

6

You should allow at least 0.5 amps per servo and 1 amp per servo would be better.

...R