Hello,
I am driving my CNC with an Arduino and GRBL software.
It works great but I have a noise issue with the limit switches. Each times the fridge turns off or on, it generates a spark which raises an "hard limit" alert.
Ok, the best option would probably be to install the CNC at another place but I can't...
The cables going from the controler box and the switched are shielded to the power supply's ground.
I have read here that capacitors may help, but I am wondering where is the best place for them, A or B ?
Both... little cap at 'A', something like 100pF. Bigger cap ( 100nF) at 'B'.
And... I've had 'strange intermittent triggerings' disappear after covering the optocoupler with grounded foil tape - as though the photosensitive transistor is also 'EMR' sensitive.