my Raspberry Pi projects

connecting an HD44780 LCD module

schematic

schematic

Only digital signals are shown.

list of parts

GPIO pins required

software

Library and “Hello, World!” demo in Python by me:

connecting a 4×4-button keypad

schematic

schematic (only digital signals are shown)

list of parts

GPIO pins required

software

Library and demo in Python by me:

(The schematics were drawn with TinyCAD.)