hey, i need a code for control 2 servos by slide and 2 servos by switch, and i need a diagram for make a app by app inventor 2, thanks 
thanks
Your welcome!
It's usual here to ask for help, not a total solution. So post what you've got so far: what have you tried? What have you researched? Then ask specifics: I tried "this" but "that" happened, and we'll try to help.
What's a slide?- a potentiometer? Have you even looked, for instance, at the servo knob example?
Have you looked at any of the examples?
What does "control" actually mean, to you? Start the servo moving back and forth? Go to a specific position? What?.....
What's "app inventor 2"?
I understand you want to remote control servo's via Bluetooth
Have a look here
This App should fullfill your needs
I think Elvis has left the building!