I have had no problems with this board. My time was spent studying the firmware code from GitHub......but for me it was a fun challenge. I have limited and outdated programming skills but I was determined to crack that code!
I did have one question for Bart and he responded right away. It was regarding the proper memory allocation used uploading to the esp32. The information is online if you do the research. He pointed me right to it. (Thanks Bart)....It is here: https://github.com/bdring/Grbl_Esp32/wiki/Compiling-the-firmware
If you are unsure about your project and just want to get GRBL running on an esp32, I would suggest spending a week or two and get GRBL uploading in Demo Mode (which is default to insure that no shorts will fry any components). After you reach that point, you are only a few minutes away from enabling GRBL to run your machine.
I tested it with four G-Code senders and they all work. Universal G-Code sender 2.0 is fine. If you want more features, the board will also run with GrblGru using Grbl-Mega-5x mode.
The extra grounds provided on the inputs are very handy and make it easier to keep your wiring organised.
I wired my board for external drivers to use larger motors. That part is easy. Only 3 wires per axis will get your motors moving.
I am looking forward to watching and learning as Bart's project continues to grow.
I bought a Twang32 almost ready to go. All I needed was LED strips, power supply, and to clip one end of the LED strips and attach it inside the Twang32. Super easy to do.
Hard to believe a game on a single LED wide strip can be so much fun, but everyone loved it. The sound is pretty loud.
The only reason I dinged it 1 star is the quality of the 3D print isn't the best. Looks like it was done on an old MakerBot or something. Does not affect performance or playability and is still highly recommend this.
FWIW: The parts are printed on a Lulzbot Ta6 and a Matterhackers Pulse XE. I print with the maximum layer height possible for best durability. At public Maker Faire type events, people Twang the heck out of them, so they need to be tough.
Well made and good looking board; exactly as described. Arrived fast and well packed.
I have installed an AliExpress ESP32S and LV7829 stepper drivers, they simply plugged in and worked; initial software load went horribly awry due to me shortcutting stuff and corrupting the index file I uploaded then fighting that instead of going to sleep. Following morning I started by erasing the flash on the ESP32 using esptool; and then following the instructions linked above from scratch I arrived at a working box with a local access point half an hr later.. :-)
Software is still evolving, plenty usable right now, with more to come of course. Only thing I miss is 'Go To Zero' buttons for the axes; but these are normally done via macros so it's not an issue. Connectivity via the serial/USB works as normal for GRBL, and I even telnetted to it successfully. I have not tried the bluetooth features; I left them disabled in source since it's not in my roadmap.
Youtube video review and demo of it in action is here: https://youtu.be/jcl5qk3Hnro