Hi,
I am in the process of designing a small controller based on an ESP32 board to control (via FluidNC) an old trotec laser refurbished with a chineese 40W CO2 laser + lps. (I will trash all the electonics inside the trotec, keep only the mechanical parts + switches and DC motors that I convert to “pseudo steppers”).
I wrote this post before reading the current thread : Can Grbl-LPC set the power via IN and fire via L? - #8 by freedom2000
And finally I wonder if my idea to PWM the IN signal is the right approach !
If you convince me that PWM on L is the best approach then it will be simpler for my ESP32 as I can directly input PWM at 3.3V on L pin and the opto on the D/L pin will do the level shifting to 5V for me !
BTW is the opto fast enough to handle PWM frequency ? How fast should it be to properly modulate the laser power to engrave images ?
Thanks for your help : this forum and this thread are particularly interesting !
JP