There is a second variant of this IC available in the market called the PCF8574A. If we look at the back of the board the pins are all labeled starting from. Then we have the 8 I/O pins plus one Interrupt pin (P0 to P7 ). ![]() The PCF8574 IC followed by the 3 jumpers for A0, A1 and A2 with high and low positions. ![]() Here is a brief overview of the PCF8574 IC’s pin diagram: These I2C pins extend from the LCD Module for easy connection with the Arduino. It achieves this with just two lines of the I2C interface, namely the SDA (Serial Data) and SCL (Serial Clock) pins, which allow you to configure 8 bidirectional I/O pins. The PCF8574 is an I2C-based I/O expander IC, offering 8-bit I/O expansion for microcontrollers with I2C interfaces. You only need two data pins to control the LCD, for more information about this topic go to I 2C 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.
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