Linear actuators are a great help when you’re moving something along a single axis, but with so many options, how do you decide? [Jeremy Fielding] walks us through some of the high level ...

Code running on an ATmega328 determines if a person is detected on the left or right, and moves the eyes appropriately. [CroMagnon] used an old CD-ROM drive optics sled to move Gawkerbot’s eyes.