---
product_id: 33978284
title: "SunFounder IIC I2C TWI Serial 2004 20x4 LCD Module Shield Compatible with Arduino R3 MEGA (IIC 2004)"
brand: "sunfounder"
price: "€ 28.54"
currency: EUR
in_stock: true
reviews_count: 8
category: "Sun Founder"
url: https://www.desertcart.com.cy/products/33978284-sunfounder-iic-i2c-twi-serial-2004-20x4-lcd-module-shield
store_origin: CY
region: Cyprus
---

# I2C interface uses only 2 I/O pins 20x4 character display Contrast adjustable potentiometer SunFounder IIC I2C TWI Serial 2004 20x4 LCD Module Shield Compatible with Arduino R3 MEGA (IIC 2004)

**Brand:** sunfounder
**Price:** € 28.54
**Availability:** ✅ In Stock

## Summary

> 📟 Elevate your Arduino projects with sleek, smart display power!

## Quick Answers

- **What is this?** SunFounder IIC I2C TWI Serial 2004 20x4 LCD Module Shield Compatible with Arduino R3 MEGA (IIC 2004) by sunfounder
- **How much does it cost?** € 28.54 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.cy](https://www.desertcart.com.cy/products/33978284-sunfounder-iic-i2c-twi-serial-2004-20x4-lcd-module-shield)

## Best For

- sunfounder enthusiasts

## Why This Product

- Trusted sunfounder brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Minimal Pin Usage:** I2C interface slashes wiring complexity by requiring just two Arduino pins.
- • **Customizable Backlight:** Choose to power your backlight or save energy by unplugging the jumper cap.
- • **Crystal Clear 20x4 Display:** Showcase 80 characters across 4 vivid rows for detailed project readouts.
- • **Effortless Contrast Control:** Fine-tune your screen visibility with a built-in potentiometer—no extra tools needed.
- • **Seamless Arduino Compatibility:** Plug-and-play with Arduino R3 and MEGA boards for rapid prototyping.

## Overview

The SunFounder IIC I2C 2004 LCD Module Shield offers a compact 20x4 character display with adjustable contrast and a low-pin-count I2C interface, fully compatible with Arduino R3 and MEGA boards. Perfect for professionals seeking to add clear, customizable visual feedback to their embedded projects.

## Description

Buy SunFounder IIC I2C TWI Serial 2004 20x4 LCD Module Shield Compatible with Arduino R3 MEGA (IIC 2004): Electronics - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Big, bright, easy to use I2C LCD display - Big, bright, easy to use LCD display. This is a 4 line by 20 character LCD display with a daughter card that provides a simple I2C interface. Ignore the portion of the product description that says this is a shield or intended for an Uno or a Mega2560. This display will work with any micro-controller that supports I2C communications (basically, all of them). To use this display you need to connect four wires: Vcc, Gnd, SDA, and SDC. You can have several I2C devices on the same I2C lines, so there is little reason to use anything other than the standard connections for your controller. I used an Arduino Nano which is slightly amusing with this display - the Nano is no larger than the I2C daughter card attached to the back of the LCD display, so it is dwarfed by the display. Load an I2C LCD library; I used the one from the vendor, see their page at wiki.sunfounder.cc/index.php?title=I2C_LCD2004. There also is a link to the spec sheet for the interface chip on the I2C daughter card they added to the display. I have not read it in any detail, but it looks like a fairly simple I2C to 8 bit parallel interface, which is what is needed to easily drive an LCD display like this. There is also a potentiometer to control display contrast (not brightness, just contrast). You will need to adjust that contrast if your drive voltage changes. I have attached a short video from this display; contrast is turned relatively high so you can clearly see the dots and character blocks. The video enters characters starting at the top right. Notice that at the end of the first line, entry moves to the third line, then to the second, and then to the fourth. I also ran the display shifting characters in from the right end of the first line (well, third line the way things actually work), although that is not shown. When shifting in from the right, entry starts at the end of the third line and characters shift up through the first line, then entry moves to the start of the fourth line and characters shift up to the second line. Things should work fine as long as you don't try to put more than 20 characters in a line, at which point expect to be confused. A very nice display that is very easy to use.
Review: Worked well for my application - Worked out nicely on a speedometer I was building for my model railroad. Easy to see and adjust.

## Features

- Sunfounder I2C LCD 2004 displays characters of 4 rows with 20 characters in each
- You can adjust the contrast by the potentiometer at its back.If you don't want the backlight, you can also unplug the jumper cap at the LCD back
- IIC/I2C interface; only takes two I/O ports
- Compatible with Arduino R3/MEGA board
- With this LCD Module Shield, you can display whatever you want by programming the board.It is a perfect choice to make your project more interesting and vivid

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Standing screen display size | 3 Inches |
| RAM | LPDDR |
| Brand | SunFounder |
| Series | 8541582407 |
| Item model number | 8541582407 |
| Operating System | Linux |
| Item Weight | 3.05 ounces |
| Product Dimensions | 7.5 x 5 x 0.2 inches |
| Item Dimensions  LxWxH | 7.5 x 5 x 0.2 inches |
| Color | LCD2004 & I2C (1Pack) |
| Processor Brand | Atmel |
| Number of Processors | 1 |
| Voltage | 5 Volts |
| Manufacturer | SunFounder |
| ASIN | B01GPUMP9C |
| Is Discontinued By Manufacturer | No |
| Date First Available | June 7, 2016 |

## Product Details

- **Brand:** SunFounder
- **Model Name:** 8541582407
- **Connectivity Technology:** I2C
- **Operating System:** Linux
- **CPU Manufacturer:** Atmel

## Images

![SunFounder IIC I2C TWI Serial 2004 20x4 LCD Module Shield Compatible with Arduino R3 MEGA (IIC 2004) - Image 1](https://m.media-amazon.com/images/I/71MzP4CZQtL.jpg)

## Available Options

This product comes in different **Color** options.

## Questions & Answers

**Q: It it possible to change the address of the lcd to have multiple lcd on the same bus?**
A: To further expand on Wes' answer (which is excellent!), you can have up to eight (8) on the same bus, per the chip datasheets. The chips have a portion of the address hard-code (which cannot be changed) and the three remaining address lines (A0, A1, and A2) can be jumpered to ground to set seven (7) other addresses - the 8th being no jumpers. IF you happen to get one with an 8574 chip and another with 8574A or 8574T, then you could potentially have up to 16 modules on the same bus as the A and T versions use a different hard-coded address than the 8574.

**Q: Has anyone run this display on 3.3 volts successfully? I'd like to use it on an 8266-12E to display the ip address.**
A: It works on 3.3V, but just barely: it's unusably dim. I changed the supply voltage to 5V and was able to successfully drive it with 3.3V-level I2C signals, although the PCF8574 data sheet says that the minimum Vih level is 0.7 * Vcc = 3.5V. My scope says that the signals are rising to about 3.8V, so there must be some kind of pull-up to 5V on the I2C backpack board. I don't want to rely on that, so for my final design I'll use a PCA9306 I2C level shifter.

**Q: Do these come with an I2C backpack?  I just ordered some of these and they came with no backpack in the package.**
A: There are several product options on the page, some have I2C, some don't. If you chose one that has I2C, it should come with an I2C backpack.

**Q: Does this work for the old raspberry pis that have a 26 pin gpio?**
A: This module uses an i2c serial interface rather than discrete gpio pins.  If your rpi has an i2c, it should work.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Big, bright, easy to use I2C LCD display
*by J***. on June 17, 2017*

Big, bright, easy to use LCD display. This is a 4 line by 20 character LCD display with a daughter card that provides a simple I2C interface. Ignore the portion of the product description that says this is a shield or intended for an Uno or a Mega2560. This display will work with any micro-controller that supports I2C communications (basically, all of them). To use this display you need to connect four wires: Vcc, Gnd, SDA, and SDC. You can have several I2C devices on the same I2C lines, so there is little reason to use anything other than the standard connections for your controller. I used an Arduino Nano which is slightly amusing with this display - the Nano is no larger than the I2C daughter card attached to the back of the LCD display, so it is dwarfed by the display. Load an I2C LCD library; I used the one from the vendor, see their page at wiki.sunfounder.cc/index.php?title=I2C_LCD2004. There also is a link to the spec sheet for the interface chip on the I2C daughter card they added to the display. I have not read it in any detail, but it looks like a fairly simple I2C to 8 bit parallel interface, which is what is needed to easily drive an LCD display like this. There is also a potentiometer to control display contrast (not brightness, just contrast). You will need to adjust that contrast if your drive voltage changes. I have attached a short video from this display; contrast is turned relatively high so you can clearly see the dots and character blocks. The video enters characters starting at the top right. Notice that at the end of the first line, entry moves to the third line, then to the second, and then to the fourth. I also ran the display shifting characters in from the right end of the first line (well, third line the way things actually work), although that is not shown. When shifting in from the right, entry starts at the end of the third line and characters shift up through the first line, then entry moves to the start of the fourth line and characters shift up to the second line. Things should work fine as long as you don't try to put more than 20 characters in a line, at which point expect to be confused. A very nice display that is very easy to use.

### ⭐⭐⭐⭐⭐ Worked well for my application
*by S***E on November 24, 2025*

Worked out nicely on a speedometer I was building for my model railroad. Easy to see and adjust.

### ⭐⭐⭐⭐⭐ Muy conforme
*by L***Z on November 30, 2025*

Excelente producto

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*Product available on Desertcart Cyprus*
*Store origin: CY*
*Last updated: 2026-02-07*