Eccentric Workshop Forum

Hi and thanks for your response. Link to the optical switches: https://www.amazon.com/gp/product/B07MFT8NWJ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 A little background may be helpful. I am migrating my design from an UNO with a CNC shield. It was working in that setup but I am discoverin...

I am trying to use a 3-wire optical switch for a limit switch without success. I can hook the signal line up to pin 10 (XLIM) directly without the Mega shield and it behaves correctly with the GRBL monitor I am using but I have had no luck with the Mega shield attached. I've tried a few scenarios. C...