Im Makefile (Im Editor öffen):

Das suchen:
# If there is more than one source file, append them above, or adjust and
# uncomment the following:
SRC += asuro.c
Und der rote hinzufügen (die asuro.c kann auch anders heissen):
# If there is more than one source file, append them above, or adjust and
# uncomment the following:
SRC += asuro.c i2c.c pcf8574.c lcd.c