![]() ![]() Even with the low-speed I/O offloaded, a multi-motor system can still run short of output pins due to the restrictions on some pins. Grbl_Esp32 has a PR for an I2C expander that will be integrated in the near future. The plug-in IO modules support the use of an MCU or I/O expander, connected via I2C or SPI or UART, for additional low-speed I/O. Posted in cnc hacks, Robots Hacks Tagged cnc, ESP32, gcode, grbl Post navigation We can think of one shop that finally lost its last excuse for making the move. We’re really impressed with the thought that went into this, and we’ll venture a guess that having something like this available is going to kickstart a lot of stalled CNC machine projects. The video below gives a quick tour of the controller. The best part is that the IO module spec is completely open, so designing custom modules should be a snap. There’s also room for five IO modules the current collection of modules includes a four-channel switch input, a relay output, an RS-485 module and a 0-10-V interface for talking to a variable frequency drive (VFD) spindle controllers, and buffered 5-V output module. CNC USB CONTROLLER CONTROL ROLE DRIVERSThere’s support for up to six channels of steppers, either directly on the board with Pololu-style modules or as external drivers using pluggable screw terminal blocks. CNC USB CONTROLLER CONTROL ROLE PLUSFirst, everything is modular - the main PCB is basically a motherboard with little more than a 5-volt power supply and some housekeeping electronics, plus a lot of headers. In fact, the current controller bears a strong family resemblance to his version 1.0 dev board, with a few conspicuous and intriguing additions. The idea behind ’s latest creation started with his port of GRBL to the ESP32. That’s where something like this modular CNC controller could really prove to be a game-changer. ![]() Metal or wood construction? Welded or bolted? Timing belts or lead screws? And even once the mechanical bits are sorted, you still face a universe of choices in terms of control electronics. If you’re building a CNC machine from scratch, the number of decisions you have to make is nearly boundless. ![]()
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