Checklist

This project I use this person as a reference https://www.instructables.com/id/Random-Machine/.

I use this as a checklist for triathlon.

Arduino breadboard

Arduino Uno*1

LCD*1

Few Wires

Button*2

330Ω resistance*2

https://create.arduino.cc/editor/ChiehLiu/962bd325-98b0-44d9-83b8-a379a0b3fec8/preview

You can find a box and put your Arduino inside the box and use the utility knife to cut out the place to put LCD and the button.