Keyestudio 4DOF Manual page 216

{
pos3=180;
}
}
// the lower arm will draw back
void LF()
{
pos3=pos3-1;
myservo3.write(pos3);
delay(5);
if(pos3<35)
{
pos3=35;
}
}
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Test Result:
Upload the code, connect it up and power on, after connecting the Bluetooth APP, press the key to control the
robot arm do commanded motions.
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