How To Use a 20-Character 4-Line LCD on Breadboard
JLCPCB Prototype for $2(Any Color): https://jlcpcb.com
Putting characters on a 20x4 character LCD with nothing more than a handful of switches.
2004 20x4 Character LCD Display Module HD44780 Controller Blue Blacklight https://ebay.us/rtw2Mm
http://lcd-linux.sourceforge.net/pdfdocs/lcd1.pdf
http://lcd-linux.sourceforge.net/pdfdocs/lcd2.pdf