two servos on Arduino pins 9 and 10...one moves the other stays static

Other Hardware Robotics
1

Hello,

I have connected to firgelli -I actuators directly to an Arduino Mega 2560. Power connections are from +5V and GND, and the signals go to pins 9 and 10. However when I run the code only the one connected to pin 10 works, the other has no movement. Could it be due to the low power to move both? Or am I missing anything? The code is supposed to move both servos from 0 to 180 degrees in steps of 1:

#include <Servo.h> 
 
Servo servo1;   
Servo servo2;
                
int pos1 = 0;     
int pos2 = 0;
 
void setup() 
{ 
  servo1.attach(9);   
  servo2.attach(10);
} 
 
 void loop() 
{ 
  for(pos1 = 0; pos1 < 180; pos1 += 1) 
  {                                  
    servo1.write(pos1);    
    delay(15);                      
  } 
  for(pos2 = 0; pos2 < 180; pos2 += 1)   
  {                                   
    servo2.write(pos2);    
    delay(15);                        
  }
  
  for(pos1 = 180; pos1>=1; pos1-=1)    
  {                                
    servo1.write(pos1);    
    delay(15);                       
  }
  for(pos2 = 180; pos2>=1; pos2-=1)    
  {                                
    servo2.write(pos2);    
    delay(15);                        
  } 
}

I would appreciate your help, feel like this is small mistake somewhere.

2

Swap the servos to see if it is a hardware/connection problem.

3

Hard to say which particular actuator you're using, but looking at the L12 series, the stall current is 450mA - far in excess of what the arduino can provide. Just as when using servos, a separate power supply is required. DOn't forget to connect the grounds.

4

Hi
Since you are not using the two servos simultaneously, if one of them is working, the other must work as well. Try using a different pin say for example 10 and 11. :slight_smile:

Chandra

5

nevermind...
one of the actuators was dead...thank you.
I bought stepper motors instead. will post on anew topic!?