I hope someone can help me and give clear instructions on how to set up this. I'm searching for clear instruction but seems like i'm just getting confused. I'm using grbl(milling/laser) post processor in fusion 360. Some instructed to setup something in the grbl software or in ugs. but seems like relay is already turning on even though i've just plugged in the power cable for arduino. i set up that circuitry using the normally open (NO) on the relay connected to an led bulb just for testing. I've read a lot of forums already, some says i can connect the input pin on the relay on the "+z limit switch input" since starting at grbl v.9 there was a modification on pins 11 & 12. I really hope someone in here can help me with the complete setup between the ugs controller, cnc v3 shield and the arduino relay.
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