Help needed

Using Arduino Motors, Mechanics, Power and CNC
1

I built a small Hexapod that runs on 12 9g micro servos, all of that is running on an Arduino MEGA.
The code is using MegaServo library so that I can run them smoothly. I tested out all the servos individually on a prototype shield. It all worked fine. But as soon as I tried to get them to work at the same time they all started doing their own thing independent of the code. Note that I connected the server to a separate power supply that is connected to a arduino troulgh a common GND.
Here's the code

#include <MegaServo.h>
#define NBR_SERVOS 12  // the number of servos, up to 48 for Mega, 12 for other boards
#define FIRST_SERVO_PIN 2 

MegaServo Servos[NBR_SERVOS] ; // max servos is 48 for mega, 12 for other boards
                               //B1=1, B2=2 ,B3=3 ,B4=4 ,B5=5 ,B6=6 ,A1=7 ,A2=8 ,A3=9 ,A4=10 ,A5=11 ,A6=12
int pos = 0;      // variable to store the servo position 
int i;
int po[12]={20,20,20,20,20,20,90,90,90,90,90,90};
int f=0;

void Fow(){
  for(i=0;i<3;i++)
    Servos[i].write(po[i]+f); //1-3B up
  for(i=7;i<10;i++)
    Servos[i].write(po[i]+f); //1-3A Fov
  for(i=10;i<12;i++)
    Servos[i].write(po[i]-f); //4-6A back
  for(i=0;i<3;i++)
    Servos[i].write(po[i]-f); //1-3B down
  for(i=4;i<7;i++)
    Servos[i].write(po[i]+f); //4-6B up
  for(i=7;i<10;i++)
    Servos[i].write(po[i]+f); //4-6A Fov
  for(i=10;i<12;i++)
    Servos[i].write(po[i]-f); //1-3A back
  if(f==20)
    f=0;
  else
    f++;
}

void setup(){
  for( i =0; i < NBR_SERVOS; i++)
    Servos[i].attach( FIRST_SERVO_PIN +i, 500, 2400);
  
  for( i =0; i < NBR_SERVOS; i++)
    Servos[i].write(po[i]);
}
void loop(){
  for(i=0;i<6;i++)
    Servos[i].write(po[i]+80);  //stnad
}

Note: void Fow() is not used right now
Thank you for your time

2

Could it simply be that you're expecting all the servos to reach their new positions in zero time?

3

Note that I connected the server to a separate power supply

What server? Do you mean servos? What power supply?

4

I meant to say Servos, the power supply that I used was adjustable power supply that was set to 5V and 1.5A max.

5

I tried to run all of the servos individually and it worked. I run the A servos(the ones connected to the pins 2-7) and it works fine. But when I try to run the b servos (8-13 on the arduino mega) they all bug out. Each of them do their own thing.

6

I meant to say Servos, the power supply that I used was adjustable power supply that was set to 5V and 1.5A max.

1500mA to drive a dozen servos?
That's optimistic.

7

6 of them seem to run run just fine on 5V 600mA(they are really small servos). That's not the point, as soon as the last 6 motors are involved the whole thing goes haywire.