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bdurbrow / grbl-Mega

An open source, embedded, high performance g-code-parser and CNC milling controller written in optimized C that will run on an Arduino Mega2560
https://github.com/gnea/grbl/wiki
MIT License
35 stars 8 forks source link

Enhancement: pwm on m7 and m8 #16

Open thawkins opened 4 years ago

thawkins commented 4 years ago

This is not an urgent requirments, its more a placeholder request.

Currently m7 and m8 enable and disable the coolant and flood funtions, i have 12v centeralfugal blower on m7, and i have aquired a 12v liquid pump and misting setup for m8, both are capable of variing thier response based on pwm. At the moment they can only be turned on and off (D9 and D10). Having the ability to set the output via pwm would be cool, but would require a modification to the gcode. Alternatly if enabled the systen could use the current Sxxxx value so

S500 M7

Would set the coolant pump to 50% pwm.

We could hijack a $nnn value to set the m7, m8 behaviour.

bdurbrow commented 4 years ago

S should always control the spindle; however there are other designations that could be used.

Both of those pins are on Timer 2; which is being used for the 976hz system clock. It shouldn't be much work to turn PWM on for those.

erosenst commented 3 years ago

You can use laser mode to make pwm. $32=1, $30=1000, then m4, S500 and when there is movement "hotbed" output pwm 50%.