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Combining GPIO with mechanical switch

I'm having a hard time figuring out where to mount the trigger switch on my highly customized Ender 3. I've figured out how to control it with an I/O line on control board, but if like to also have the option of the mechanical switch got manually controlling it. If it feasible to connect the switch on parallel with the GPIO control?

6 comments

6 Comments

Bill

Feb 04, 2024

The issue is that normally a GPIO pin would be pulled to ground, whereas our switch is pulled high. So, without including an inverter in the mix, you really can't because the signals are opposite of each other.

A normal switch mount on an Ender 3 is on the front of the Y axis like we do in the installation video. There are mounts on Printables for it.

Bill

las_vegas

Feb 04, 2024

Replying to

Yes. I tried that and it worked. My problem was that when I level with the ABL it triggers the switch while probing the rightmost side of the bed. Not a big problem since it triggers it for about 15 counts each time. I'm also considering adding a purge bucket to the right side,

wjsteele

Feb 04, 2024

Replying to

Yes, as long as it's not a valid command, it will be fine. You can also purge there, which will be perfect... Just back it off 1mm while purging so they both live in the same space.

Bill

las_vegas

Feb 04, 2024

Replying to

Thanks Bill! Well, I finally managed to create an iteration of my BLV Trigger attachment that triggers at Y234. Close enough for my comfort. I had adjusted the printer to extend the Y axis to 240, but I don't really want to keep revising the trigger for such a minor change.

Tony