---
product_id: 33978284
title: "IIC I2C TWI Serial 2004 20x4 LCD Module Shield Compatible with Arduino R3 MEGA (IIC 2004)"
brand: "sunfounder"
price: "302 kr"
currency: NOK
in_stock: true
category: "Sun Founder"
url: https://www.desertcart.no/products/33978284-iic-i2c-twi-serial-2004-20x4-lcd-module-shield-compatible
store_origin: NO
region: Norway
---

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

**Brand:** sunfounder
**Price:** 302 kr
**Availability:** ✅ In Stock

## Summary

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

## Quick Answers

- **What is this?** IIC I2C TWI Serial 2004 20x4 LCD Module Shield Compatible with Arduino R3 MEGA (IIC 2004) by sunfounder
- **How much does it cost?** 302 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.no](https://www.desertcart.no/products/33978284-iic-i2c-twi-serial-2004-20x4-lcd-module-shield-compatible)

## 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

- • **Crystal-Clear 20x4 Display:** Showcase 80 characters in 4 vivid rows for ultimate project clarity.
- • **Effortless Contrast Control:** Fine-tune your screen visibility with a simple back potentiometer twist.
- • **Customizable Backlight Options:** Choose to glow or go dark by unplugging the jumper cap—your project, your vibe.
- • **Seamless Arduino Compatibility:** Plug & play with Arduino R3, MEGA, and Uno boards for instant prototyping.
- • **Minimal Pin Usage, Maximum Impact:** Leverage I2C tech to free up Arduino pins—just 2 I/O ports needed.

## Overview

The SunFounder IIC I2C TWI Serial 2004 20x4 LCD Module Shield is a versatile, Arduino-compatible display featuring a 20x4 character screen, adjustable contrast, and an efficient I2C interface that uses only two I/O pins. Perfect for professionals and makers aiming to add vivid, customizable visual feedback to their electronics projects with minimal wiring complexity.

## 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

## 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 |
|---------------|-------|
| ASIN | B01GPUMP9C |
| Best Sellers Rank | #65,115 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #3 in LCD Character Modules |
| Brand | SunFounder |
| Compatible Devices | Arduino R3, Arduino MEGA, Arduino Uno, Arduino Uno R3 USB Microcontroller, Mega 2560 |
| Connectivity Technology | I2C |
| Customer Reviews | 4.6 4.6 out of 5 stars (426) |
| Item Weight | 86.4 g |
| Manufacturer | SunFounder |
| Mfr Part Number | I2C LCD |
| Model Name | 8541582407 |
| Model Number | 8541582407 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Operating System | Linux |
| Processor Brand | Atmel |
| Processor Count | 1 |
| RAM Memory Technology | LPDDR |
| Total Usb Ports | 4 |
| UPC | 701715368224 743447130144 |
| Unit Count | 1 Count |
| Warranty Description | 1 Year Guarantee |

## Product Details

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

## Images

![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.

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*Product available on Desertcart Norway*
*Store origin: NO*
*Last updated: 2026-10-27*