Controlling led strip with keyboard?

Hi!

I'm working with a school project and we've built a "led infinite mirror" (like this one: - YouTube) that we control with arduino uno.

Being a beginner with both code and arduino, I could really need some guidance in the right direction!

With the led infinite mirror, we want to create the illusion of writing and sending a message into the mirror. The outcome would be that every letter of the keyboard activates different sections of the led strip. The sections could be randomized.

Any ideas/points in the right direction on how we could do that would be extremely helpful.

How much Arduino programming have you already done ?

Most of those points of light are reflections. They're the same colour and almost the same intensity as the front LED.

Where do you want the text to appear?