diff --git a/uPyConfig.py b/uPyConfig.py
index 9057e1e..0f5227a 100644
--- a/uPyConfig.py
+++ b/uPyConfig.py
@@ -17,14 +17,15 @@ class uPyConfig:
 
     class _owc:
         from onewire import OneWire
+        from machine import Pin
         def __init__(self, pin):
             if pin.__class__ != self.Pin: pin=self.Pin(pin)
             self.bus = self.OneWire(pin)
 
     class _i2c:
-        from machine import I2C
+        from machine import I2C, Pin
         def load_handle(self):
-            if self.bus.__class__ == self.I2C: return
+            if hasattr(self, 'bus'): return
             self.bus = self.I2C(scl=self.scl, sda=self.sda)
             self.bus.init(scl=self.scl, sda=self.sda)
 
@@ -36,6 +37,7 @@ class uPyConfig:
             self.load_handle()
 
     class _oled:
+        from machine import Pin
         addr = 0x0
         rst = 0
         rst_hold = False