Keyestudio 4DOF Manual page 209

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Test Code12
#include <PS2X_lib.h>
#include <Servo.h> // add the servo libraries
Servo myservo1; // create servo object to control a servo
Servo myservo2;
Servo myservo3;
Servo myservo4;
int pos1=80, pos2=60, pos3=130, pos4=0; // define the variable of 4 servo angle
and assign the initial value( that is the boot posture angle value)
PS2X ps2x; // create PS2 Controller Class
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