1 files changed, 29 insertions, 9 deletions
diff --git a/src/home/temphum/__init__.py b/src/home/temphum/__init__.py
index 55a7e1f..30a459e 100644
--- a/src/home/temphum/__init__.py
+++ b/src/home/temphum/__init__.py
@@ -1,18 +1,38 @@
-from .base import SensorType, TempHumSensor
-from .si7021 import Si7021
-from .dht12 import DHT12
+from importlib import import_module
 
 __all__ = [
     'SensorType',
     'TempHumSensor',
+    'TempHumNodes',
     'create_sensor'
 ]
 
 
-def create_sensor(type: SensorType, bus: int) -> TempHumSensor:
-    if type == SensorType.Si7021:
-        return Si7021(bus)
-    elif type == SensorType.DHT12:
-        return DHT12(bus)
+def __import_sensor(name):
+    if name == 'si7021':
+        return import_module('.si7021', __name__).Si7021
+    elif name == 'dht12':
+        return import_module('.dht12', __name__).DHT12
     else:
-        raise ValueError('unexpected sensor type')
+        raise ValueError(f'unexpected sensor type: {name}')
+
+
+def __getattr__(name):
+    if name == 'create_sensor':
+        base = import_module('.base', __name__)
+
+        def create_sensor(type: base.SensorType, bus: int) -> base.TempHumSensor:
+            if type == base.SensorType.Si7021:
+                return __import_sensor('si7021')(bus)
+            elif type == base.SensorType.DHT12:
+                return __import_sensor('dht12')(bus)
+            else:
+                raise ValueError(f'unexpected sensor type: {type}')
+
+        return create_sensor
+
+    elif name in ('SensorType', 'TempHumSensor'):
+        return getattr(import_module('.base', __name__), name)
+
+    elif name == 'TempHumNodes':
+        return import_module('.nodes', __name__).TempHumNodes