To link a standard 16×2 LCD directly with the microcontroller, for instance Arduino, you would need atleast 6 I/O pins to talk to the LCD. However, if you use an LCD module with I2C interface ...

With vendors like Sparkfun and Adafruit popping ... re running our I²C bus over a long cable, let’s now add our parasitic bus capacitor into our diagram. With a little re-jiggering, let ...