i2c io expander

In this project we will learn how to minimize the interfacing pin of 16×2 alphanumeric LCD with Arduino using PCF8574P ic.

PCF8574P ic: This IC is a silicon CMOS circuit. It provides general purpose I/O expansion for most of the microcontroller families via I2C bus. The device consists of an 8-bit quasi-bidirectional port and an I2C bus interface. The IC has low current consumption and includes latched outputs with high current drive capability.

This project is built with Arduino UNO, 16×2 alphanumeric LCD and PCF8574P IC. This IC helps to convert two wire data communication into 8-bit data line and control lines.

This project works in the following manners:

1. When you turn ON the system the library file for LCD imported and loaded in the Arduino.
2. The system will start displaying character as per the code.

COMPONENTS REQUIRED:

• Power supply.
• Arduino UNO
• PCF8574P

16×2 alphanumeric LCD

CIRCUIT CONNECTION:

According to the block diagram the controlling part is the Arduino UNO interfaces I2C based PCF8574P  IC with 16×2 alpha numeric LCD the circuit are attached to it are:

1. Power supply
2. PCF8574P IC
3. 16×2 LCD

Power Supply: Here USB is used as the power supply from the computer.

PCF8574P and 16×2 LCD: Follow the table for the connection.

How the Project Works:

A best written library function is available in the arduino.

It will start displaying automatically.

Search and Download code, circuit diagram from this LINK.