![]() If You are using MKS Gen L (or similar standalone board), find and unsolder same fuse off the PCB, it should not be hard to locate, look near USB port also righthand side.Īlternative is to always use specially prepared USB cable with +5V (red wire) cutted off. This way you will be safe with any USB cable in the future. ![]() If You use RAMPS 1.4/1.5 as shield on Arduino Mega, just unsolder fuse F1 from Arduino Mega 2560 PCB, which is located on righthand side of Arduino Mega 2560 USB port (it is 3x5mm SMT fuse) and thus cut off powering Arduino from USB. There are two ways of preventing this to happen: This is the most likely the case of your failure. This applies to Arduino Mega Shields and standalone boards as well, and can happen not just when flashing, but also when using the board in many scenarios, for instance if main battery dies while device is still attached to USB, if you unplug power supply or if you turn off the device before unplugging USB from PC. If you supply +5V VIO (logic) to these drivers BEFORE VM (say +12V VMOT), you will burn them and most likely burn attached μC unit as well, which is happening when you attach μC to USB without previously supplying +12V to the RAMPS. One important note when using TMC SSS (TMC2208, TMC2209, TMC2130, TMC5160.): Let me know how it goes or if you need more info. If not you will have to disable gear changing in the config utility, and manually set the jumpers to the correct step mode. If you add cables from the correct pins on this IDC header to the mode select pins underneath the motor drivers, you should get full functionality. The top 10-pin IDC header is used to output the microstep mode pins. You will need to add a 1k resistor between D49 and D41 which are both on the 10-pin header. The ST4 pins including that used for the hand-controller are present on the lower 10-pin IDC header on the right hand side of the board. ![]() #define resetPin_1_Define 37 //Unused on RAMPS #define resetPin_0_Define 35 //Unused on RAMPS #define gpioPin_2_Define 41 //IO2 - GPIO Pin #define gpioPin_1_Define 33 //IO1 - GPIO Pin #define gpioPin_0_Define 49 //IO0 - GPIO Pin I can help betatest this if you are doing the change. #define Axis2_M0 31 // Pin 31 (Microstep Mode 0 or SPI MOSI) #define Axis2_M1 33 // Pin 33 (Microstep Mode 1 or SPI SCK) #define Axis2_M2 35 // Pin 35 (Microstep Mode 2 or SPI CS) #define Axis2_Aux Aux2 // Pin 37 (ESP8266 RST or SPI MISO) #define Axis2_HOME 21 // Pin 21 (Home sw) #define Axis1_M0 23 // Pin 23 (Microstep Mode 0 or SPI MOSI) #define Axis1_M1 25 // Pin 25 (Microstep Mode 1 or SPI SCK) #define Axis1_M2 27 // Pin 27 (Microstep Mode 2 or SPI CS) #define Axis1_Aux Aux1 // Pin 29 (ESP8266 GPIO0 or SPI MISO) #define Axis1_HOME 20 // Pin 20 (Home sw) This is the pinmap used by another TC project: The datasheet for the MKS Gen L is here:
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