Thank you, but It is called a RAMPS 1.4 shield for the Arduino. That is short for “Rerap Arduino Mega Pololu Shield”. It is actually quite a popular and established controller. It is used on literally millions of machines, primarily in 3D printing and laser cutters, but also for popular CNC machines like the ShapeOKO. It is NOT a ramping voltage.
The controller is outputting 0-5v PWM signal from 0% to 100% duty cycle. In fact, Arduinos are incapable of producing an analog output.
I can’t explain what an Arduino is here, but more information can be found here:
https://reprap.org/wiki/Arduino_Mega_Pololu_Shield
Perhaps someone with a better idea of what an Arduino/grbl setup is has an idea? I am especially confused as to why the PWM input pin on the SuperPID has a positive voltage when not connected to anything.
I’ve tried to be very precise as to what my setup is, but they say a picture is worth a thousand words. The arrow I drew appears to point to the PG terminal, but I mean the PWM terminal. That’s where I’m getting an unexpected voltage.
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