[Grbl_Esp32 Issue#63] Raspberry PI Hat version

#1 – gflaser-au 于 2018-12-01

I took a quick look at your schematic and have a couple of comments.
1, r6 and r1 look incorrect. I think you intend those to be pull-ups, they should connect between 3v and the inputs ( not across the switches)
2, the limit switch capacitor pack u7 should be on the other side of the 100ohm resistors. Also consider adding footprints for more pull-up resistors on the limit sw inputs ( connected to the esp pins.) additional pull-up has helps lots of people with noisy setups. These inputs are very sensitive.
3, as matter of convention, gnd symbols “point” down.

I’d urge you to test out the esp32 WebUI. It is actually very useful and you can then connect directly from and pc / laptop via WiFi to upload g code files to the sd card and control the machine.
The only thing missing from the likes of CNC.js and (my fav) lasergrbl, is the visualizer.

#2 – gflaser-au 于 2018-12-01

Oh and, if you have an esp32 nodemcu board that you can program – you can test out the WebUI without actually having a CNC machine. Just squirt in the code and make sure grbl
Is configured to not use hard limits or homing – and either pull up the 4x control inputs or comment them out in cpu_map.h.
From there you could attach an sd card to the right pins and upload file if you wanted to. It’s worth testing out for sure. 😁

#3 – edcasati 于 2018-12-01

Thank you so much for your feedback.
As you can see, I really don’t know much of what I’m doing. I recently retired for health reasons, and aside from needing to find a hobby or drive my wife crazy, I need too really force my brain to keep it working. Hence the challenge like this one. But enough of that…

Is there a mistake in your posted V3.1 schematics? It looks like the ‘Hold’ input is miswired.
http://www.buildlog.net/blog/wp-content/uploads/2018/10/schmesp32cnctestv3p1.pdf

I made every change you pointed out or recommended. Now to double check things and the part that I’m dreading… routing the wires.