I can't seem to make this 16x4 LCD ( 16x4 STN Character LCD - Focus LCDs ) work with the PCF8574T backpack (I2C module). Just a blank screen but the backlight works. Based on this tutorial: https://tinyurl.com/kukgb5k , I assumed it will work. The pinouts of my LCD and the tutorial is the same. But I …

Using LCD (ST7066U Controller) with PCF8574T Backpack

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