Portable Math Device

I wanted to build something with Arduino that was actually useful, so I made a handheld math quiz device. It's got a 128x64 OLED screen that shows the problem and two push buttons to pick your answer. Most of the work was on the software side — writing the logic to randomly generate problems, checking answers, and getting the graphics to actually show up right on the screen using the U8g2 library. It's a small screen, so I had to be careful about what I could actually fit on it. It's a pretty simple project, but it was a good way to actually learn how microcontrollers, displays, and input all work together instead of just reading about it.