My 6 year old grandson is a big EZ-Robot fan and can build an Adventure Bot from scratch in 15 minutes now by himself. He decided to add a claw to the robot and was happy that he could control it with Joystick #2 on the Logitech F710 controller.

He was not so happy when he wanted to add a 2nd and 3rd claw and I told him there were no other joysticks available. His comment was "why can't I just push a button on the controller to tell it which claw the joystick #2 is to control?"

After some research, I set Joystick #2 to control virtual servos V0 & V1 and then used joystick button scripts to set an $arms variable (0,1,2)

Then I added a looping script to read the virtual servos and based on the value in $arms to control the correct servos

Code:

ServoSpeed( d2, 1) 
ServoSpeed( d3, 1) 
ServoSpeed( d4, 1) 
ServoSpeed( d5, 1) 
ServoSpeed( d8, 1) 
ServoSpeed( d9, 1) 

$arms=0

:loop
  $X= GetServo( v0 ) 
  $y= Getservo( v1 )
  
if ($arms=0) 
   servo( d2, $x ) 
   servo( d3, $y) 
endif

if ($arms= 1)     
  servo( d5, $x) 
  servo( d6, $y) 
endif

if ($arms=2) 
  servo( d8, $x) 
  servo( d9, $y) 
endif

Goto (loop)

Really worked out well, and he understands the concept, but not the code (yet)...