diff --git a/homeassistant/components/arduino/__init__.py b/homeassistant/components/arduino/__init__.py
index f973ec136e3..61b03a3160d 100644
--- a/homeassistant/components/arduino/__init__.py
+++ b/homeassistant/components/arduino/__init__.py
@@ -1,13 +1,15 @@
 """Support for Arduino boards running with the Firmata firmware."""
 import logging
 
+from PyMata.pymata import PyMata
 import serial
 import voluptuous as vol
 
-from PyMata.pymata import PyMata
-
-from homeassistant.const import EVENT_HOMEASSISTANT_START, EVENT_HOMEASSISTANT_STOP
-from homeassistant.const import CONF_PORT
+from homeassistant.const import (
+    CONF_PORT,
+    EVENT_HOMEASSISTANT_START,
+    EVENT_HOMEASSISTANT_STOP,
+)
 import homeassistant.helpers.config_validation as cv
 
 _LOGGER = logging.getLogger(__name__)
diff --git a/homeassistant/components/arduino/sensor.py b/homeassistant/components/arduino/sensor.py
index a92432537ca..c5863475512 100644
--- a/homeassistant/components/arduino/sensor.py
+++ b/homeassistant/components/arduino/sensor.py
@@ -3,11 +3,11 @@ import logging
 
 import voluptuous as vol
 
-from homeassistant.components.sensor import PLATFORM_SCHEMA
 from homeassistant.components import arduino
+from homeassistant.components.sensor import PLATFORM_SCHEMA
 from homeassistant.const import CONF_NAME
-from homeassistant.helpers.entity import Entity
 import homeassistant.helpers.config_validation as cv
+from homeassistant.helpers.entity import Entity
 
 _LOGGER = logging.getLogger(__name__)
 
diff --git a/homeassistant/components/arduino/switch.py b/homeassistant/components/arduino/switch.py
index 63d83c8575e..5b5b161a24a 100644
--- a/homeassistant/components/arduino/switch.py
+++ b/homeassistant/components/arduino/switch.py
@@ -4,7 +4,7 @@ import logging
 import voluptuous as vol
 
 from homeassistant.components import arduino
-from homeassistant.components.switch import SwitchDevice, PLATFORM_SCHEMA
+from homeassistant.components.switch import PLATFORM_SCHEMA, SwitchDevice
 from homeassistant.const import CONF_NAME
 import homeassistant.helpers.config_validation as cv