Arduino Mega spindle pwm control advanced settings

[Orob-Maslow]

Added 2 modes for spindle power switching so now they are:
-None
-Servo
-Relay High
-Relay Low
-Speed Relay High
-Speed Relay Low
(menu screen shot)

The speed options will activate pin 45 in the firmware to output a scaled pwm signal mapped to 0 to max spindle speed with a power-on speed of spindle minimum.

spindle max and spindle min are editable settings in advanced settings as well.

The speed controls only work if the speed mode is enabled and the spindle activates and deactivates via a relay as before with the M3 and M5 commands. The S4000 command is to set the spindle speed to 4000. Additional testing is required to verify it all works.

[GeroBH]

Need a some more time.
The hard-coded speed limits worked perfect, setting them in the software had some issues yesterday 13th Sep 2020.
Could not replicate them enough to report. Only, setting medium speed worked once, but then no more and seemed to give a fluctuating voltage. I will hook up an oscilloscope to see what is actually going on with the PWM signal.
But first need to clean up the pi and set up a new environment with your forks:
https://github.com/Orob-Maslow/WebControl/tree/mega_spindle_pwm_control_support
https://github.com/Orob-Maslow/Firmware/tree/HoleySpindlePwm