--- product_id: 33978284 title: "SunFounder IIC I2C TWI Serial 2004 20x4 LCD Module Shield Compatible with Arduino R3 MEGA (IIC 2004)" brand: "sunfounder" price: "Β£15.58" currency: GBP in_stock: true reviews_count: 4 category: "Sun Founder" url: https://www.desertcart.co.uk/products/33978284-sunfounder-iic-i2c-twi-serial-2004-20x4-lcd-module-shield store_origin: GB region: United Kingdom --- # I2C interface, 2 I/O pins 20x4 character display Adjustable contrast potentiometer SunFounder IIC I2C TWI Serial 2004 20x4 LCD Module Shield Compatible with Arduino R3 MEGA (IIC 2004) **Brand:** sunfounder **Price:** Β£15.58 **Availability:** βœ… In Stock ## Summary > πŸ“Ÿ Elevate your Arduino game 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?** Β£15.58 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/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 - β€’ **Minimal Pin Usage:** Only 2 I/O pins needed thanks to efficient I2C connectivity. - β€’ **Customizable Visuals:** Easily tweak contrast for perfect readability in any environment. - β€’ **Crystal Clear 20x4 Display:** Showcase detailed info with 80 characters across 4 lines. - β€’ **Seamless Arduino Compatibility:** Plug & play with Arduino R3, MEGA, Uno, and more. - β€’ **Expand Your Project’s Potential:** Add vivid, dynamic text displays to elevate your DIY builds. ## Overview The SunFounder IIC I2C TWI Serial 2004 LCD Module offers a crisp 20x4 character display with an easy-to-use I2C interface that requires just two I/O pins. Compatible with popular Arduino boards like R3, MEGA, and Uno, it features an adjustable contrast potentiometer for optimal viewing and supports versatile programming to bring your projects to life with vivid, dynamic text output. ## Description Buy SunFounder IIC I2C TWI Serial 2004 20x4 LCD Module Shield Compatible with Arduino R3 MEGA (IIC 2004): Electronics - desertcart.com βœ“ FREE DELIVERY possible on eligible purchases Review: Simple display, easy to implement. - Implemented this into my injection molder. Worked great 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. ## 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 | #49,110 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #4 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 | 4.5 4.5 out of 5 stars (423) | | Item Weight | 86.4 Grams | | Manufacturer | SunFounder | | Mfr Part Number | I2C LCD | | Model Name | 8541582407 | | Model Number | 8541582407 | | Operating System | Linux | | Processor Brand | Atmel | | Processor Count | 1 | | RAM Memory Technology | LPDDR | | Total Usb Ports | 4 | | UPC | 701715368224 743447130144 | | Warranty Description | 1 Year Guarantee | ## Product Details - **Brand:** SunFounder - **CPU Manufacturer:** Atmel - **Connectivity Technology:** I2C - **Model Name:** 8541582407 - **Operating System:** Linux ## 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 ### ⭐⭐⭐⭐⭐ Simple display, easy to implement. *by M***S on January 31, 2026* Implemented this into my injection molder. Worked great ### ⭐⭐⭐⭐⭐ 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. ## Frequently Bought Together - SunFounder IIC I2C TWI Serial 2004 20x4 LCD Module Shield Compatible with Arduino R3 MEGA (IIC 2004) - ELEGOO 120pcs Multicolored Dupont Wire 40pin Male to Female, 40pin Male to Male, 40pin Female to Female Breadboard Jumper Ribbon Cables Kit Compatible with Arduino Projects - ELEGOO MEGA R3 Board ATmega 2560 + USB Cable Compatible with Arduino IDE Projects RoHS Compliant --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/33978284-sunfounder-iic-i2c-twi-serial-2004-20x4-lcd-module-shield](https://www.desertcart.co.uk/products/33978284-sunfounder-iic-i2c-twi-serial-2004-20x4-lcd-module-shield) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-17*