read me

Author: markasoftware

README.md

@@ -1,2 +1,7 @@
 # cat-door
-AVR firmware for my electronic cat door.
+
+KiCAD files and ATtiny84 firmware for my [cat door](https://markasoftware.com/cat-door).
+
+The state machine diagram is old and incorrect. The unit tests in `test.lisp` do
+not work, partially because they are written rong, and partially because simavr
+seems to have bugs related to inputs with pull-up resistors.