The tag 'sd1602' is only used once. This is the project:
LCD screen SD1602VBWB-XA-G-G test project
A simple test circuit and code to say "Hello World" on the LCD screen.
Using very popular and cheep LCD device SD1602VBWB-XA-G-G that contains also popular LCD controller HITACHI HD44780. Circuit, wiring and code are extremely simple.