robot_arm_example.ino

// https://github.com/netlabtoolkit/VarSpeedServo
#include <VarSpeedServo.h>

VarSpeedServo myservo1;
VarSpeedServo myservo2;
VarSpeedServo myservo3;

void setup() {
  myservo1.attach(9);
  myservo2.attach(10);
  myservo3.attach(11);
} 

void loop() {
  // pick up
  myservo1.write(85, 30, true);
  myservo2.write(0, 30, true);
  //myservo3.write(90, 30, true); // open
  delay(500);
  myservo3.write(140, 30, true); // close

  // rotate 90 degrees
  myservo2.write(45, 30, true);
  myservo1.write(0, 30, true);

  // put on
  myservo2.write(0, 30, true);
  myservo3.write(90, 30, true); // open
  myservo2.write(45, 30, true);
  delay(2000);
}