Using more servos issue with ATMEGA168-20PU microcontroller

Projects Programming
1

Hi Folks,

I'd like to use more (4 servos) in the same time. Everything's working fine when I connect my servos to my Arduio Mega board, but when I upload my sketch to the chip the servos just tremble and do not sweep. However if I connect only one servo the sketch is working like a charm and the servos are sweeping. I powered my ATMEGA chip and the servos from my Arduino board. I cannot find out what could be the problem please help me it is driving me crazy...

Many thanks!

Here's my very simple code:

#include <Servo.h>

Servo servo1; 

Servo servo2;

Servo servo3;

Servo servo4;

int i = 0;


void setup() {

  servo1.attach(3);

  servo2.attach(5); 

  servo3.attach(6); 

  servo4.attach(9); 

}

void loop() {

  for (i = 0; i < 180; i++) { 

    servo1.write(i);              

    servo2.write(i);     

    servo3.write(i);

    servo4.write(i);         

    delay(10);                      

  }

  for (i = 180; i > 0; i--) { 

    servo1.write(i);                

    servo2.write(i);     

    servo3.write(i);

    servo4.write(i);          

    delay(10);                      

  }

}
2

Welcome to the forum

That is generally not a good idea. The Arduino is not intended to be used as a power supply. Consider using a separate power supply for the servos

How is the project powered ?
Is the board resetting ?

3

Thanks for your answer.

"How is the project powered ?" -> my Arduino board? I'm powering from my PC with USB cable.
"Is the board resetting ?" -> what do you mean resetting?

I don't understand why it's working with arduino and don't working on the chip. Same power or I'm wrong?

4

I mean starting again as if you had pressed the reset button

Put a print statement in setup() and run the sketch with the Serial monitor open. How many times do you see the message ?

5

Oh..ok I'll try...

6

For servos you need a separate 4.8-6V power supply, capable of providing at least 1 Ampere per small servo, 2.5 A/servo for larger ones like the MG996R.

A 4xAA battery pack will work for 1 or 2 of the small SG90 servos. Don't forget to connect all the grounds.

7

OK. Thank you for your answer.

8

OK. Thank you for your answer. So for example if I want use 4 servos I need a 5V/5A adapter to power all the four servos right?

9

As mentioned, that depends on the type of servo you have.

10

I'm using SG90 servos.

11

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