Keyestudio 4DOF Manual page 210

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//right now, the library does NOT support hot pluggable controllers, meaning
//you must always either restart your Arduino after you conect the controller,
//or call config_gamepad(pins) again after connecting the controller.
int error = 0;
byte vibrate = 0;
int s1,s2,s3,s4;
int jiyi1[20]; // define four array, separately used to save the angle of 4 servos.
int jiyi2[20];
int jiyi3[20];
int jiyi4[20];
int i=0;
int j=0;
void setup()
{
Serial.begin(57600);
// boot posture
myservo1.write(pos1);
delay(1000);
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