Voron0.2 3D打印机屏幕

更改电源稳压IC为通用AMS1117-3.3，可用跳线(pin1、pin2可以选择VCC、GND)兼容新旧版本的oled屏，可短接跳线SJ3不用SN74LVC1G17DBVR处理LED信号，增加USB匹配电阻，将usb座改为立式方便走线同时也可以用XH2.54-4P插头线，目前已在自己的V0.2上正常服役了。

在Klipper配置文件里添加上以下代码 

[mcu display]
serial: /dev/serial/by-id/usb-Klipper_stm32f042x6_display-if00
#在这里填写屏幕的串口地址，使用ls /dev/serial/by-id/*查找

restart_method: command

[display]
lcd_type: sh1106
i2c_mcu: display
i2c_bus: i2c1a
encoder_pins: ^display:PA3, ^display:PA4
#encoder_pins: ^display:PA4, ^display:PA3  #旋转编码器反向
click_pin: ^!display:PA1
kill_pin: ^!display:PA5
x_offset: 2
#vcomh: 0
#   Set the Vcomh value on SSD1306/SH1106 displays. This value is
#   associated with a "smearing" effect on some OLED displays. The
#   value may range from 0 to 63. Default is 0.
#   Adjust this value if you get some vertical stripes on your display. (31 seems to be a good value)

[neopixel displayStatus]
pin: display:PA0
chain_count: 1
color_order: GRB
initial_RED: 0.2
initial_GREEN: 0.05
initial_BLUE: 0