diff --git a/example_simple.py b/example_simple.py
index fb8b887..b182061 100644
--- a/example_simple.py
+++ b/example_simple.py
@@ -1,4 +1,6 @@
 from lcdMenu import lcdMenu
+from machine import Pin, I2C
+from PCF8574T import I2C_LCD
 
 prev_btn = Pin(13, Pin.IN, Pin.PULL_DOWN)  # input of the first btn
 next_btn = Pin(14, Pin.IN, Pin.PULL_DOWN)  # input of the second btn