diff --git a/homeassistant/components/pjlink/const.py b/homeassistant/components/pjlink/const.py
new file mode 100644
index 00000000000..95e29e5bf23
--- /dev/null
+++ b/homeassistant/components/pjlink/const.py
@@ -0,0 +1,8 @@
+"""Constants for the PJLink integration."""
+
+CONF_ENCODING = "encoding"
+
+DEFAULT_PORT = 4352
+DEFAULT_ENCODING = "utf-8"
+
+DOMAIN = "pjlink"
diff --git a/homeassistant/components/pjlink/media_player.py b/homeassistant/components/pjlink/media_player.py
index 3fb5facac5e..4bbf1225a92 100644
--- a/homeassistant/components/pjlink/media_player.py
+++ b/homeassistant/components/pjlink/media_player.py
@@ -19,11 +19,7 @@ import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
 
-CONF_ENCODING = "encoding"
-
-DEFAULT_PORT = 4352
-DEFAULT_ENCODING = "utf-8"
-DEFAULT_TIMEOUT = 10
+from .const import CONF_ENCODING, DEFAULT_ENCODING, DEFAULT_PORT, DOMAIN
 
 ERR_PROJECTOR_UNAVAILABLE = "projector unavailable"
 
@@ -51,9 +47,9 @@ def setup_platform(
     encoding = config.get(CONF_ENCODING)
     password = config.get(CONF_PASSWORD)
 
-    if "pjlink" not in hass.data:
-        hass.data["pjlink"] = {}
-    hass_data = hass.data["pjlink"]
+    if DOMAIN not in hass.data:
+        hass.data[DOMAIN] = {}
+    hass_data = hass.data[DOMAIN]
 
     device_label = f"{host}:{port}"
     if device_label in hass_data: