Tag Archives: I2C

ESP8266 or ESP32 I2C LCD display Interface

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In IoT, LCD is rarely required, but some times its useful to monitor errors and connection related issues. In this tutorial we are interfacing I2C LCD with ESP8266 or ESP32. Both code examples are given.

We have very few IOs on ESP8266 and ESP32. I2C based display interface uses only two IO lines.

ESP8266 I2C LCD Interface
ESP8266 and ESP32 I2C LCD Interface

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LCD interface using I2C Module with Arduino

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I2C module with LCD display using Arduino

 How to interface PCF85574 module with arduino?
To connect LCD display 16×2 or 20×4 to Arduino you know you’ll need at least 6 wires to connect, it means sacrificing some IO’s that could be used for connecting other components such as sensors or motors. another way is to use 74HC595 Shift register for interfacing. In this tutorial we will discuss on PCF8574 I2C LCD Display Interface.
A module that can be used to circumvent this problem is the I2C Module for LCD Display with PCF8574 (datasheet ):

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