Installing the library is as easy as checking ... The SPI routines in the ESP32 Arduino port both work just fine. I tested it out by connecting a 25LC256 SPI EEPROM to the chip.

Plus the Arduino needs to be plugged into the host computer via USB to function, a rather quaint idea to many in 2018. These were just some of the reasons he decided to port Grbl to the ESP32 board.

Thanks to their low power consumption, inexpensive price tags, and multiple I/O options, ESP32, Arduino, and other microcontroller ... to the Raspberry Pi, install some add-ons, and use them ...