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並前往https://forum.repetier.com/discussion/1840/i2c-lcd-with-pcf8574-hangs-the-firmware

I2C LCD with PCF8574 hangs the firmware - Repetier-Forum

UI_DISPLAY_I2C_ADDRESS 0x40 (the A0 A1 A2 pins of the PCF8574 are a ground). I tried also the address 0x20, 0x21, 0x41.

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