I was using the above config up until the recent upgrade to 0.30.1.
arduino:
port: /dev/ttyACM0
switch:
platform: arduino
pins:
11:
name: Fan Office
type: digital
12:
name: Light Desk
type: digital
default: on
negate: true
13:
name: Internal LED
type: digital
After the upgrade, I got a message on the home screen (which was nice) to say that switch.arduino was broken.
After working through the log, I see the configuration was changed at https://home-assistant.io/components/switch.arduino/ but I did not see this mentioned under breaking changes in the recent blog post.
I’ve fixed this now but it may be worth letting folks know?
arduino:
port: /dev/ttyACM0
switch:
platform: arduino
pins:
11:
name: Fan Office
12:
name: Light Desk
13:
name: Internal LED