diff --git a/doc/joystick-adapter.jpg b/doc/joystick-adapter.jpg
new file mode 100644
index 0000000..479932c
Binary files /dev/null and b/doc/joystick-adapter.jpg differ
diff --git a/doc/plugged-in.jpg b/doc/plugged-in.jpg
new file mode 100644
index 0000000..5be4dd2
Binary files /dev/null and b/doc/plugged-in.jpg differ
diff --git a/doc/schematic.pdf b/doc/schematic.pdf
new file mode 100644
index 0000000..570114e
Binary files /dev/null and b/doc/schematic.pdf differ
diff --git a/doc/with-joystick.jpg b/doc/with-joystick.jpg
new file mode 100644
index 0000000..becdcb0
Binary files /dev/null and b/doc/with-joystick.jpg differ