bdring

You could use the spindle enable pin for the relay. `#define SPINDLE_ENABLE_PIN GPIO_NUM_2`

I might be able to write a custom machine definition file. It would help to know exactly what you are trying to do and why.

I have other Grbl_ESP32 boards with SPI driver support. It can use a lot of extra I/O. You need a Chip Select pin for each driver. I have a test...

Here are some photos of that controller.  

OK. I am out of town, so it will take a day or so. I have a few extras assembled. I would be willing to part with one, but only...

Attached is the schematic. I am away from my office until Aug 20th on vacation. I do not have time to create a proper repo for the controller. I can...

We treat the communications methods as separate channels. If Bluetooth asks for status, only Bluetooth gets the status. The serial port is treated as the debugging port because it is...

@dvisser Repo created https://github.com/bdring/4_Axis_SPI_CNC

Maybe you should offer a bounty :-)

That looks good. While the output of the spindle is PWM, it is on one of the ESP32s 8-bit DAC pins. With a small firmware change, you might be able...