The following is a wiring cheatsheet for the BTT SKR Mini E3 V1.2 and 3D-Touch, which can be a tricky combination to work with at times. These instructions should make the process much smoother for those attempting to get these two components working together.
Wiring Cheat Sheet
First, you'll want to connect the Z limit switch to the Z+ endstop slot on the SKR board. The 3D-Touch sensor should be connected to the servo slot on the SKR board, and the sensor's signal wire should be connected to the Z-min endstop slot on the SKR board. The 3D-Touch sensor should also be connected to a 5V power source.
Next, connect the X, Y, and Z stepper motors to their corresponding slots on the SKR board. The extruder stepper motor should be connected to the E0 slot on the SKR board. Connect the X, Y, and Z endstop switches to their corresponding slots on the SKR board as well.
Lastly, you'll need to connect the LCD screen to the SKR board. Connect the screen's EXP1 and EXP2 connectors to the SKR board's LCD connectors, then connect the screen's reset button to the SKR board's reset connector. If the backlight flickers when the hotbed PWM is active, you can fix this issue by connecting a resistor of value 470 ohms between the VCC and GND lines of the LCD backlight connector.
Fixing Flickering Backlights
If your LCD backlight is flickering when the hotbed PWM is active, you can fix this issue by connecting a 470 ohm resistor between the VCC and GND lines of the LCD backlight connector. This should stabilize the display, and prevent it from flickering during operation.
By following these simple wiring instructions, you should be able to successfully integrate the BTT SKR Mini E3 V1.2 and 3D-Touch into your printer setup. Just remember to take your time, double-check all of your connections, and always observe proper safety precautions when working with electronics.
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