I’m primarily interested in 2 or 3 pins of I/O and trying to hack that
outcome through Gcode – any help or comments appreciated.
For some reason, I don’t find any docs/examples relating to this output
or how PWM quite works – or what the electrical spec is (maybe I missed
it). I’m curious why there is no open collector/buffers or even relays
provided onboard? It appears a 150ohm resistor limits the output. Can they
source or sink 10ma?
There are conflicting silkscreen terms used on the LEDs vs. the output
pins, but they appear to be identical. So, it appears
SpOn LED = Spin pin – ?
SpDir LED = Sdir pin – ?
I’ll just use the LED terms. To start, PWM is glowing (perhaps pwm’ing) and SpON, SDir, Coolant lights are off. So, my “hack” –
M7 – coolant pin on
M9 – coolant pin off
M3 – SpOn ON, SpDir OFF
M5 – SpOn OFF, SpDir OFF
M4, M5 – SpOn OFF, SpDir ON
M3, M5 – SpOn OFF, SpDir OFF
In the latter two cases, the other pin will flash between commands – not
perfect, but this might work. If I knew a little more about setting the PWM,
perhaps I could set that between 0% and 100% and create a fourth GPIO.
I do notice the lines must be separated by CR – “M3 M5” doesn’t work. But,
not a big deal.
Does this make sense? Is there a better idea – perhaps a hidden command or Gcode to simple toggle these outputs?
Thanks! Gregg
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