I am completely new to this site and robotics, but I have experience in programming, and programming microcontrollers.
I would like to create a grid of "pixels", where each "pixel" is a metal or wooden dowel that is programmed to push in and out, like a piston.
I'm imagining a lot of pixels, maybe 40x40, where each could be quite small in diameter (1/4"). The Arduino would have control over the linear movement - up and down - of each pixel.
Could anyone point me in the right direction for accomplishing this?