Nice. Are you planning to post NEMO to kickstarter or indiegogo?by AlexStar - Developers
Sub-board for extruder and heatbed can be even be simpler. It's just any low cost MCU with serial port to handle G-codes related to PWMs and analog reads. One and more hotends can be supported. This board can have more that 3D-printer use-cases as well. There are no firmware is capable to handle ESP32 at this time, so should we start with opening stepper and extruder/heatbed sub-boards for any MCby AlexStar - Developers
IDC DC3 connector is cheap and it's good choice. Pin 2 - 3.3v Pin 5 - 5v Pin 7 - GND MOSI, MISO, CLK and four NSS can be on any other pins. Developers with $3 ST-Link and standard IDC cable will be able to play with sub-board in Arduino using software SPI library.by AlexStar - Developers
What about sub-board with just four TMC2130 drivers with 10-pin JTAG compatible socket? No issue with stability, golden contacts and the board can be driven either by main ESP32 board with four 10-pin connectors or by small ST-LINK device with new firmware? Sub-board can be used not only for 3D-printers...by AlexStar - Developers
Here is my vision on the modern RepRap: Let’s add more stuff to the mix. Most likely everyone has old android cell phone. If not (iPhone fans) then $10 phone from Net10 or $20 phone from Best Buy should work. We don’t need huge power of SmartDragon 845 and it’s cheaper than Raspberry PI anyway. Old tablets dusting in garage can be used as well. - Bluetooth, WiFi, SD card reader, touchscreen and cby AlexStar - Developers