1602 LCD using I2C Adapter

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All of these 1602, 2002, 2004 LCD modules use the same HD44780 controller chip.
Download the documentation for it: https://www.sparkfun.com/datasheets/LCD/HD44780.pdf

Here's a schematic showing how the PCF8574 connects to the LCD:
https://www.electrodragon.com/w/File:1602_IIC_schematic_R2.png 

Basically, via the I2C bus and the I2C expander, you are bit-banging commands & data into the display's
parallel interface, using its 4-bit bus interface (4 of the bus pins aren't used).

Other links:
http://wiki.sunfounder.cc/index.php?title=I%C2%B2C_LCD1602
https://opencircuit.shop/resources/file/da88acc1702a90667728fcf4ac9c75c455475706466/I2C-LCD-interface.pdf
https://create.arduino.cc/projecthub/akshayjoseph666/interface-i2c-16x2-lcd-with-arduino-uno-just-4-wires-273b24
https://www.makerguides.com/character-i2c-lcd-arduino-tutorial/
https://www.electrodragon.com/w/1602_LCD
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