There are TMC driver protection devices (that use Vio to power Vmot) which should avoid issues with this available on aliexpress, eBay, etc.
#Mks gen 1.4 dual axis drivers
A special USB cable with the V+ wire cut or modify the Mega2560. stepper drivers you should take steps to ensure +5V power from the USB port of the Mega2560 doesn't power up the stepper driver logic section without the stepper motor power supply present.
*** It's up to you to understand the design, connection, limitations, and use of this device and its components, I accept no responsibility. Dew-heaters (etc) on 3x screw terminals.Stepper driver outputs on 0.1" pin-headers.Power in for stepper motors and heaters on two screw terminal jacks.
#Mks gen 1.4 dual axis serial
Mega2560 USB port provides a USB virtual serial port interface for connection from a PC.Easiest OnStep firmware upload/update compared to other options with a simple to configure software environment and an upload that doesn't require physical access to the controller.The Mega2560 has 4KB of true EEPROM which is nice for user catalog storage. Non-volatile memory/EEPROM: Built-in, no external device required.Performance: Uses the Mega2560 micro-controller, 8 bit and 16Mhz so it's the slowest OnStep supported option.Please read the MKS Gen-L Wiki for more information, especially about safety and limitations, and schematics that detail how the various pins are wired. There are several other similar options but the above has the most desirable features at a good price and is well tested. While not recommended as the first choice when building a Mega2560 based OnStep, the RAMPS series boards and earlier MKS Gen-L V1 are still commonly used so there are the Wiki pages covering those here RAMPS 1.4, 1.5, 1.6 and here MKS Gen-L V1.Ī better choice is the MKS Gen-L V2.0 or v2.1, these boards are an integrated Arduino Mega2560 + Ramps1.4 on a low cost single board that has the important advantage of 24V support, not needing an RTC added to improve its tracking accuracy, and support for plugging in SPI configurable stepper drivers for micro-step mode switching support with minimal hassle.