Not exactly Arduino but I am running GRBL on a board with a ATMEGA328 and I figured there would be some expertise here that could confirm if my idea would work.
Basically I want to wire up a basic continuity probe to probe pins that also turns on an LED when the probe is triggered.
From what I've read the GRBL probe pin is set as an input using the internal pullup. So my plan would be to wire up an led with resistor, powered from the onboard regulator on the board, so that when the probe is triggered it connects both the cathode of the LED and the pin to ground.
I drew it up on a circuit simulator and it seems to be doing what I want but I thought I would just check this isn't going to cause any issues.
Below is a screenshot of the simulator, the push button is representing the physical probe plate.
Thanks.
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