LaserGRBL is usually used with diode engraving machines. If you want more power, you must choose CO2 laser machines, but these machines are usually more expensive, larger, more complex to use, and most of them use their own control software. Therefore, the control board is needed to connect the engraving machine and LaserGRBL! Many laser engraving hobbyists start using diode engravers. They are used to LaserGRBL, and after switching to K40 CO2 engraving machine, they still want to use LaserGRBL first, and want to gradually upgrade to Lightburn. Then Monport upgrade controller will be a good software bridge for these people. Usually, the Arduino board cannot be connected to LaserGRBL and Lightburn, nor can it control the laser intensity. Monport upgrade board can be applied to LaserGRBL and Lightburn, and its various interfaces can help engravers better control the laser intensity.