Currently the library is designed without delay of an optocoupler. For a DRV8825 driver only 1 microsecond delay is used. With optocoupler it should be 10microsecond. Waiting in a loop should be avoided.

The plotter sketch has an additional gcode interpreter. To access the gcode a ESC (Dec:27) has to be sent as a prefix for eache line.
The CNCLib windows app should add the ESC to access e.g. the SD card.

Small CNC machines do not support G82. The windowns application should substitute the G82 to a sequence of G0 and G1 commands

About the Plotter Limit Switch
I use the RAMP1.4 package, burning plotter firmware, (no LCD, I have the program in the LCD-related part of the comment out), but the limit switch does not work, the maximum and minimum are not action.
But the HPGL command file can be executed.
Please give me some suggestions, thank you!

Hi,aiten
I want to make a cnc with ramp1.4. However, there was no response after burning the firmware. Does cnclib support minicnc? What should I do?
Thank you! good luck!

Configure some plotter parameters (e.g. pen move speed) in Eeprom

The SP command (hpgl) should be supported.
see https://en.wikipedia.org/wiki/HPGL

The plotter sketch should support the ramps 1.4 LCD (12864 - st7920)

• rotary button
• SD support

Use Project Template "Native Unit Test Project" for testing.

Importing a HPGL should center the plot to the "autoscale" size.