Keyestudio 4DOF Manual page 226

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delay(5);
if(pos4<0)
closed）
{
pos4=0;
}
}
// open the claw
if(ps2x.Analog(PSS_LX)<10)
{
pos4=pos4+8;
Serial.println(pos4);
myservo4.write(pos4);
gradually opened
delay(5);
if(pos4>108)
{
pos4=108;
}
}
}
//*********************************************************
// if pos4 value reduces to 37（the claw we test in 37degrees is
// if push the left joystick to the left
// servo 4 carries out the action and the claw is
// limit the maximum angle opened
223