Give zero volt to specific servo motors in a certain time

Question

I have a robot that uses 4 mechanical arms. Each mechanical arm has 4 "READYTOSKY 30kg" servo motors on them.

At some point, I need to use the absolute maximum force of only two mechanical arms (while the other two will stay still). Even though I do not change the coordinates of the other two mechanical arms (which I am not using),they consume voltage and "take away" the full potential of force from the other two.

Is there a way to stop the voltage consumed by the two other arms just for a brief moment using Arduino code? Shortly afterwards they will get back the voltage they need.

    if(level==25)                                                     
      { 
        pwm.setPWM(12, 0, 200);
        pwm.setPWM(13, 0, 255);
        pwm.setPWM(14, 0, 430);
        delay(100);
        pwm.setPWM(1, 0, 380);                                      
        pwm.setPWM(2, 0, 520);
        delay(500);
        pwm.setPWM(0, 0, 170);
        delay(600);
        stepperten.setCurrentPosition(0);                            
        while (stepperten.currentPosition() != (-3*200)) 
        {
        stepperten.setSpeed(-600); 
        stepperten.runSpeed();
        }
        steppertwist.setCurrentPosition(0);                        
        while (steppertwist.currentPosition() != (100)) 
        {
          steppertwist.setSpeed(200);
          steppertwist.run();
        }
        stepper1.setCurrentPosition(0);
        while(stepper1.currentPosition() != (30))         
        {
          stepper1.setSpeed(200);
          stepper1.run();
        }

        pwm.setPWM(1, 0, 295); //THIS IS THE MOMENT I NEED TO STOP VOLTAGE FOR OTHER ARMS                               
        pwm.setPWM(2, 0, 400); //AND GET THE MAXIMUM VOLTAGE POSSIBLE ON THESE TWO ARMS
        delay(1500);                                  
        pwm.setPWM(12, 0, 125);

        array1[25][0] = 170;                           
        array1[25][1] = 295;
        array1[25][2] = 400;
        array1[25][3] = 153;
        array4[25][0] = 125;
        array4[25][1] = 255;
        array4[25][2] = 395;
      }

Answer 1

If you want to turn off power for some external parts you could try to power them via the digital pins. See this example code:

void setup(){
   pinMode(YOUR_ARM_POWER_SUPPLY_PIN, OUTPUT);

   // switch arm on
   digitalWrite(YOUR_ARM_POWER_SUPPLY_PIN, ON);
}

void loop(){
  if(armMustNotUseAnyPower()){
      // switch arm off
      digitalWrite(YOUR_ARM_POWER_SUPPLY_PIN, OFF);
  }

}

Keep in mind that the digital Pins cannot output as much power as VCC. But since you drive some servo motors over it I assume they get their power externally anyway. You might need to add some transistor or another way on how to switch the power on and off from the big power source. Hope this helps you in some way.