Rotary Encoder
ATmega328P.pdf ( Register summary on p 428 )
A common sensor for rotational movement is the rotary encoder. Eg. Keyes KY-040 (in Sweden Kjell & Co Art. 87918).


The full program is available here:
rpg.txt
(for Arduino use code stored as: rpg\rpg.ino)The full program is available here:
rpg_int.txt
(for Arduino use code stored as: rpg_int\rpg_int.ino)
William Sandqvist william@kth.se