Braille Reader Need Help!

Saw this https://imgur.com/89o5eZf on hackster and I wanted to make a mini version of this braille reader like the on in the following link. https://imgur.com/a/DsGr0Dl

I’ve ordered my raspberry pi and camera(As I want it to do real-time reading) however my biggest problem is finding out what to use for the pins. I looked into solenoid but they seemed too big and I planned on making my own custom solenoids but they were still a bit big. Does anyone have any idea what they used for the second link?
I plan to use the raspberry pi zero w gpio to control each pin.

submitted by /u/Dibolero
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