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  • Hmm, just double checking pins and HD44780 documentation

    Yellow - SCL1 - B6
    Orange - SDA1 - B7

    Please try this snippet - hope it works for you.

    I2C1.setup({scl:B6, sda:B7});   
    // PCF8574AT based IO expanders default to address 0x3F
    var lcd = require("HD44780").connectI2C(I2C1, 0x3F);      
    lcd.print("Hello World!");

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