diff --git a/custom_components/HA-inepro-Modbus/const.py b/custom_components/HA-inepro-Modbus/const.py
new file mode 100644
index 0000000..23ad1d9
--- /dev/null
+++ b/custom_components/HA-inepro-Modbus/const.py
@@ -0,0 +1,31 @@
+DOMAIN = "modbus_integration"
+
+SENSOR_LIST = [
+    {
+        "name": "Voltage",
+        "unique_id": "V",
+        "device_class": "voltage",
+        "state_class": "measurement",
+        "precision": 2,
+        "address": 0x5000,
+        "input_type": "holding",
+        "count": 2,
+        "data_type": "float32",
+        "unit_of_measurement": "V",
+        "scan_interval": 5
+    },
+    {
+        "name": "L1 Voltage",
+        "unique_id": "L1V",
+        "device_class": "voltage",
+        "state_class": "measurement",
+        "precision": 2,
+        "address": 0x5002,
+        "input_type": "holding",
+        "count": 2,
+        "data_type": "float32",
+        "unit_of_measurement": "V",
+        "scan_interval": 5
+    },
+    # Add the rest of your sensors here...
+]