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lcd-screen-and-i2c-be6d78-en.md

Hi, this is my second project and the LCD can be used to present absolutely anything in written form.

Hope you liked it!

Mastering LCD Displays with I2C

Character LCDs (Liquid Crystal Displays) are legendary in the maker community for providing easy-to-read text feedback. However, wiring a standard 16x2 LCD in parallel mode requires at least 6 to 10 digital pins on your Arduino, which can quickly exhaust your available I/O. This project focuses on the I2C (Inter-Integrated Circuit) method, which reduces the wiring requirement to just 4 pins (VCC, GND, SDA, and SCL).

Key Hardware: The I2C Backpack

The core of this efficiency is the I2C adapter (often based on the PCF8574 chip) soldered to the back of the LCD. This "backpack" converts serial commands from the Arduino into parallel instructions for the LCD's HD44780 controller.

  • VCC/GND: Connect to 5V and Ground on the Arduino Uno.
  • SDA (Serial Data): Connects to Pin A4 on Arduino Uno.
  • SCL (Serial Clock): Connects to Pin A5 on Arduino Uno.

Simplified Software and Logic

To breathe life into the display, two libraries are crucial:

  1. Wire.h: A built-in Arduino library that handles the physical I2C communication.
  2. LiquidCrystal_I2C.h: This library provides high-level commands like lcd.print("Hello!"), lcd.setCursor(0, 1), and lcd.backlight().

In the code, we first initialize the display with its I2C address (typically 0x27 or 0x3F), set the column and row count, and then we can simply output sensor data, text strings, or status messages effortlessly. This leaves the majority of your Arduino pins free for more complex sensors, motors, or communication modules.

View my How to read joysticks and move servos project!

Download the LiquidCrystal_i2c By this link

Download the Wire library By this link

ข้อมูล Frontmatter ดั้งเดิม 

title: "LCD screen and i2c!"
description: "The i2c is the easiest way to control a LCD. Here it is!"
author: "danushi13"
category: ""
tags:
  - "i2c"
  - "display"
  - "lcd"
  - "cool"
  - "cool"
views: 2436
likes: 0
price: 870
difficulty: "Intermediate"
components:
  - "1x Arduino UNO"
  - "1x Jumper Wires"
  - "1x Breadboard"
  - "1x LCD and I2C"
tools: []
apps:
  - "1x Arduino IDE"
downloadableFiles: []
documentationLinks: []
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seoDescription: "Learn the simplest way to control an LCD screen using i2c for your Arduino and microcontroller projects."
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heroImage: "https://cdn.jsdelivr.net/gh/bigboxthailand/arduino-assets@main/images/projects/lcd-screen-and-i2c-be6d78_cover.jpg"
lang: "en"