These ICs have very “Low Standby-Current” Consumption of only 10μA. the I2C Pins come out of the LCD Module for easy connection with Arduino. the SDA (Serial Data) and SCL (Serial Clock), you can configure 8 bidirectional I/O Pins. Using just two lines of the I2C Interface i.e. PCF8574 is an I2C based I/O expander IC that provides 8-bit I/O expansion for microcontrollers with I2C interface. You only need two data pins to control the LCD, for more information about this topic go to I2C Liquid Crystal Display with Arduino Board. The advantage of an I2C LCD is that the wiring is very simple. This module features a PCF8574 chip (for I2C communication) and a potentiometer to adjust the LED backlight. The I2C LCDs that we are using in this tutorial come with a small add-on circuit mounted on the back of the module. This type of LCD is ideal for displaying text and numbers, hence the name character LCD. Using LCD display with Arduino board needs many I/O lines of your Microcontroller.
So, in this chapter We are going to learn LCD I2C controller simulation with Arduino mega 2560 and you only need to download the LCD library for Proteus which is quite simple. In the previous tutorial we already discussed how to interfacing LCD module with Arduino click the link: LCD Interfacing with Arduino in Proteus and installation of Arduino Library in the Proteus.
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