I successfully use EIO 19/GND to give a 3V DC input to trigger gripper with Blockly.
Ha! Ha! I didn't recognize those EIOs are the pins on the arm and base a few days ago.
If the tutorial simply gives an small hand-on example on chapter 4.3, that will be perfect for me beginner.
EIOs don't have "level input" for 5V and 12V DC input, and I do have 5V and 12V signals from other devices' outputs. That will need a few efforts! Cool! I like this Robot.