For this project you need a oled display sh1106 and a ground mositure meter YL-100.
pins from display to Arduino RES/RST 9 DC 8 CS 10 DIN/MOSI 11 SCK/CLK 13 VCC 3V/5V (i used 5V but it will work to on 3Và GND GND
pins from the mositure meter to Arduino VCC 3 OUT A0 GND GND
sh1106.cpp and sh1106.h are drivers and libraries for the display.
the svg for the lasercutter is also included.