diff --git a/.coveragerc b/.coveragerc
index a7438497aff..c25b0f45c7e 100644
--- a/.coveragerc
+++ b/.coveragerc
@@ -606,6 +606,7 @@ omit =
     homeassistant/components/omnilogic/__init__.py
     homeassistant/components/omnilogic/common.py
     homeassistant/components/omnilogic/sensor.py
+    homeassistant/components/onewire/const.py
     homeassistant/components/onewire/sensor.py
     homeassistant/components/onkyo/media_player.py
     homeassistant/components/onvif/__init__.py
diff --git a/homeassistant/components/onewire/const.py b/homeassistant/components/onewire/const.py
new file mode 100644
index 00000000000..af68135af10
--- /dev/null
+++ b/homeassistant/components/onewire/const.py
@@ -0,0 +1,12 @@
+"""Constants for 1-Wire component."""
+CONF_MOUNT_DIR = "mount_dir"
+CONF_NAMES = "names"
+
+DEFAULT_OWSERVER_PORT = 4304
+DEFAULT_SYSBUS_MOUNT_DIR = "/sys/bus/w1/devices/"
+
+DOMAIN = "onewire"
+
+SUPPORTED_PLATFORMS = [
+    "sensor",
+]
diff --git a/homeassistant/components/onewire/sensor.py b/homeassistant/components/onewire/sensor.py
index 0a7976b877b..1d0d3c2ebba 100644
--- a/homeassistant/components/onewire/sensor.py
+++ b/homeassistant/components/onewire/sensor.py
@@ -20,13 +20,15 @@ from homeassistant.const import (
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
 
+from .const import (
+    CONF_MOUNT_DIR,
+    CONF_NAMES,
+    DEFAULT_OWSERVER_PORT,
+    DEFAULT_SYSBUS_MOUNT_DIR,
+)
+
 _LOGGER = logging.getLogger(__name__)
 
-CONF_MOUNT_DIR = "mount_dir"
-CONF_NAMES = "names"
-
-DEFAULT_OWSERVER_PORT = 4304
-DEFAULT_SYSBUS_MOUNT_DIR = "/sys/bus/w1/devices/"
 DEVICE_SENSORS = {
     # Family : { SensorType: owfs path }
     "10": {"temperature": "temperature"},